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MAY
26
0

What’s in a colour? Many of you will have seen posts of infrared satellite imagery, like this one, with a colour overlay on the clouds. But what do these colours mean and why are they important? Satellites use information from different parts of the electromagnetic (EM) spectrum. An infrared satellite image uses the infrared portion of the EM spectrum. As the name suggests, this gives information about the temperature of the features being observed. This contrasts with visible satellite images, which use information from the visible part of the EM spectrum. When viewing infrared satellite imagery, the temperature of the cloud tops is what’s most important. The colours on these satellite images highlight the coldest cloud tops. The colour key in this image goes all the way above -73°C, but cloud tops can be even cold than that! As the old adage goes, you can tell a lot about a cloud by the temperature of its tops. Cold cloud tops can indicate high cloud, like the thick cirrus that often clouds over the day before a front. They can tell how high into the atmosphere the clouds go, which is crucial for aviation. They can also show clouds that are unstable and have very strong updrafts within them. Cumulonimbus clouds, like the one in this image, are a great example of this, and can even give hints at where hail is forming within the cumulonimbus complex. All of this because of a couple of coloured pixels! If you’d like to know more about how meteorologists use weather satellites, check out this blog post https://blog.metservice.com/SatelliteImages . For more satellite images over New Zealand, see https://bit.ly/NZVisible ^MM

What’s in a colour?   
Many of you will have seen posts of infrared satellite imagery, like this one, with a colour overlay on the clouds. But what do these colours mean and why are they important?   
Satellites use information from different parts of the electromagnetic (EM) spectrum. An infrared satellite image uses the infrared portion of the EM spectrum. As the name suggests, this gives information about the temperature of the features being observed. This contrasts with visible satellite images, which use information from the visible part of the EM spectrum.   
When viewing infrared satellite imagery, the temperature of the cloud tops is what’s most important. The colours on these satellite images highlight the coldest cloud tops. The colour key in this image goes all the way above -73°C, but cloud tops can be even cold than that!   
As the old adage goes, you can tell a lot about a cloud by the temperature of its tops. Cold cloud tops can indicate high cloud, like the thick cirrus that often clouds over the day before a front. They can tell how high into the atmosphere the clouds go, which is crucial for aviation.   
They can also show clouds that are unstable and have very strong updrafts within them. Cumulonimbus clouds, like the one in this image, are a great example of this, and can even give hints at where hail is forming within the cumulonimbus complex. All of this because of a couple of coloured pixels!   
If you’d like to know more about how meteorologists use weather satellites, check out this blog post https://blog.metservice.com/SatelliteImages . For more satellite images over New Zealand, see https://bit.ly/NZVisible ^MM
🟥🟧What’s in a colour?🟨🟦 Many of you will have seen posts of infrared satellite imagery, like this one, with a colour overlay on the clouds. But what do these colours mean and why are they important? S...
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MAY
25
0

Science Learning Hub on Twittermobile.twitter.com“️Is it a wet rainy day where you are? ️ Get the class excited about rain and data collection with our MAKE A RAIN GAUGE activity! https://t.co/bhI2bOpzhv #STEMeducation #scichatnz @MetService @WeatherWatchNZ @NiwaWeather”

Science Learning Hub on Twittermobile.twitter.com“️Is it a wet rainy day where you are? ️ Get the class excited about rain and data collection with our MAKE A RAIN GAUGE activity! https://t.co/bhI2bOpzhv #STEMeducation #scichatnz @MetService @WeatherWatchNZ @NiwaWeather”
Science Learning Hub on Twittermobile.twitter.com“🌧️Is it a wet rainy day where you are? ☔️ Get the class excited about rain and data collection with our MAKE A RAIN GAUGE activity! https://t.co/bhI2b...
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MAY
22
0

Severe Weather Update: deep low pressure system to impact Western Australia, 22 May 2020Watch video on Facebook.com

Severe Weather Update: deep low pressure system to impact Western Australia, 22 May 2020Watch video on Facebook.com
MAY
20
0

CYC Weather Challengecycwxchallenge.comA weather forecasting competition for CYC members, boaters and friends

CYC Weather Challengecycwxchallenge.comA weather forecasting competition for CYC members, boaters and friends
CYC Weather Challengecycwxchallenge.comA weather forecasting competition for CYC members, boaters and friends
MAY
10
0

Cold air rises—what that means for Earth's climatephys.orgConventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in the tropical atmosphere, cold air rises due to an overlooked effect—the lightness of water vapor. This effect helps to stabilize tropical climates and buffer ...

Cold air rises—what that means for Earth's climatephys.orgConventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in the tropical atmosphere, cold air rises due to an overlooked effect—the lightness of water vapor. This effect helps to stabilize tropical climates and buffer ...
Cold air rises—what that means for Earth's climatephys.orgConventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in th...
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MAY
07
0

Mount Taranaki visible from Wellington in cool still conditionsweather.net.nzAmazing. This wouldn't happen that often. Mount Taranaki from Wellington, 330Kms away! https://www.stuff.co.nz/dominion-post/news/wellington/121435312/mount-taranaki-visible-from-wellington-in-cool-still-conditions

Mount Taranaki visible from Wellington in cool still conditionsweather.net.nzAmazing. This wouldn't happen that often. Mount Taranaki from Wellington, 330Kms away! https://www.stuff.co.nz/dominion-post/news/wellington/121435312/mount-taranaki-visible-from-wellington-in-cool-still-conditions
Mount Taranaki visible from Wellington in cool still conditionsweather.net.nzAmazing. This wouldn't happen that often. Mount Taranaki from Wellington, 330Kms away! https://www.stuff.co.nz/dominion-pos...
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MAY
06
0

We are in the process of building up regional weather pages on the weather.net.nz site. On these pages you can find ECMWF forecasts from Windy.com, Metservice.com forecasts, and current weather conditions from personal weather stations in that region. Here's one of the recent ones we've completed Wellington Regional Weather Pageweather.net.nzCheck out the new weather summary page we are building for this region:

We are in the process of building up regional weather pages on the weather.net.nz site. On these pages you can find ECMWF forecasts from Windy.com, Metservice.com forecasts, and current weather conditions from personal weather stations in that region. Here's one of the recent ones we've completed Wellington Regional Weather Pageweather.net.nzCheck out the new weather summary page we are building for this region:
We are in the process of building up regional weather pages on the weather.net.nz site. On these pages you can find ECMWF forecasts from Windy.com, Metservice.com forecasts, and current weather condit...
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APR
30
0

Many of us have weather stations, with devices to upload weather info, or even just a spare machine. Much of the time they are sitting there underutilised. Now you can put those CPU cycles to good use. Help us fight COVID-19 by joining us on [email protected] : https://foldingathome.org/start-folding/ Once you have setup [email protected], look for Team 263144 to join #Foldingathome #FightCOVID19 Start folding – [email protected] you keep going with your everyday activities, your computer will be working to help us find cures for diseases like cancer, ALS, Parkinson’s, Huntington’s, Influenza and many others.

Many of us have weather stations, with devices to upload weather info, or even just a spare machine. Much of the time they are sitting there underutilised. Now you can put those CPU cycles to good use.   
Help us fight COVID-19 by joining us on Folding@home : https://foldingathome.org/start-folding/   
Once you have setup Folding@home, look for Team 263144 to join #Foldingathome  #FightCOVID19 Start folding – Folding@homefoldingathome.orgWhile you keep going with your everyday activities, your computer will be working to help us find cures for diseases like cancer, ALS, Parkinson’s, Huntington’s, Influenza and many others.
Many of us have weather stations, with devices to upload weather info, or even just a spare machine. Much of the time they are sitting there underutilised. Now you can put those CPU cycles to good use...
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APR
28
0

https://www.sanluisobispo.com/news/weather/weather-watch/article242070636.html What is the difference between drizzle and rain? It’s all in the dropswww.sanluisobispo.comHere’s the official difference between these precipitation forms, according to John Lindsey.

https://www.sanluisobispo.com/news/weather/weather-watch/article242070636.html What is the difference between drizzle and rain? It’s all in the dropswww.sanluisobispo.comHere’s the official difference between these precipitation forms, according to John Lindsey.
https://www.sanluisobispo.com/news/weather/weather-watch/article242070636.htmlWhat is the difference between drizzle and rain? It’s all in the dropswww.sanluisobispo.comHere’s the official difference ...
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APR
19
0

Koru cycloneWatch video on Facebook.com

Koru cycloneWatch video on Facebook.com
APR
18
0

Photos from MetService New Zealand's post

Photos from MetService New Zealand's post
Photos from MetService New Zealand's post
APR
15
0

Photos from Wellington City Council's post

Photos from Wellington City Council's post
Photos from Wellington City Council's post
APR
07
0

Tropical Cyclone #HAROLD becomes the 2nd strongest cyclone to hit Vanuatu on record - peaks at 165 knots (912 mbar)! » Severe Weather Europewww.severe-weather.euHere is a recap post of the extremely powerful Category 5 Tropical Cyclone #Harold over Vanuatu. The system has peaked at 165 mph (145 knots) and 912 mbar at 12 UTC today, Apr 6th. One-third of Vanuatu population has been affected, severe wind damage and flooding has been reported. Harold’s behavi...

Tropical Cyclone #HAROLD becomes the 2nd strongest cyclone to hit Vanuatu on record - peaks at 165 knots (912 mbar)! » Severe Weather Europewww.severe-weather.euHere is a recap post of the extremely powerful Category 5 Tropical Cyclone #Harold over Vanuatu. The system has peaked at 165 mph (145 knots) and 912 mbar at 12 UTC today, Apr 6th. One-third of Vanuatu population has been affected, severe wind damage and flooding has been reported. Harold’s behavi...
Tropical Cyclone #HAROLD becomes the 2nd strongest cyclone to hit Vanuatu on record - peaks at 165 knots (912 mbar)! » Severe Weather Europewww.severe-weather.euHere is a recap post of the extremely p...
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APR
06
0

At Home Meteorological Experiments | MetService Blogblog.metservice.comIf you are trying to entertain the kids at home or are just looking for a meteorological experiment then you've come to the right place! First up we have the Cloud in a Bottle experiment: Equipment: • 1 large clear-plastic bottle with a screw-on top (e.g. a 3-litre juice bottle) • 1 match • 1 ...

At Home Meteorological Experiments | MetService Blogblog.metservice.comIf you are trying to entertain the kids at home or are just looking for a meteorological experiment then you've come to the right place! First up we have the Cloud in a Bottle experiment: Equipment: • 1 large clear-plastic bottle with a screw-on top (e.g. a 3-litre juice bottle) • 1 match • 1 ...
At Home Meteorological Experiments | MetService Blogblog.metservice.comIf you are trying to entertain the kids at home or are just looking for a meteorological experiment then you've come to the right...
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APR
06
0

8 am Monday (Vanuatu): Cyclone HAROLD really pulled together overnight, and is now an intense storm with a big, clear eye—now a Cat 5 on the Oz scale. (JTWC estimates winds of 125 knots (145 mph/230 km/h), making this a mid-range Cat 4 on the USA scale.) It's just about to make landfall on the W coast of Espiritu Santo (pop ~40K). The cyclone will trek ESE, so the island's largest town, Luganville (pop ~10K), will begin to really feel the impacts in the coming hours. Other islands that will feel HAROLD's wrath over the next 6-24 hours, include Malekula, Malo, Aore, Tutuba, Ambae, Maewo, Pentecost, Ambrym, Epi, and others in this area. This is a dangerous cyclone. TAKE COVER NOW.

8 am Monday (Vanuatu): Cyclone HAROLD really pulled together overnight, and is now an intense storm with a big, clear eye—now a Cat 5 on the Oz scale. (JTWC estimates winds of 125 knots (145 mph/230 km/h), making this a mid-range Cat 4 on the USA scale.) It's just about to make landfall on the W coast of Espiritu Santo (pop ~40K). The cyclone will trek ESE, so the island's largest town, Luganville (pop ~10K), will begin to really feel the impacts in the coming hours. Other islands that will feel HAROLD's wrath over the next 6-24 hours, include Malekula, Malo, Aore, Tutuba, Ambae, Maewo, Pentecost, Ambrym, Epi, and others in this area. This is a dangerous cyclone. TAKE COVER NOW.
8 am Monday (Vanuatu): Cyclone HAROLD really pulled together overnight, and is now an intense storm with a big, clear eye—now a Cat 5 on the Oz scale. (JTWC estimates winds of 125 knots (145 mph/230 k...
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APR
05
0

We've started our #TCHarold blog on our website. Feel free to provide comments and additional info, or just say thanks: https://weather.net.nz #CycloneHarold #Harold Homeweather.net.nzWeather learning centre, assisting in the understanding of meteorological concepts with a focus on New Zealand.

We've started our #TCHarold blog on our website. Feel free to provide comments and additional info, or just say thanks:  https://weather.net.nz #CycloneHarold #Harold Homeweather.net.nzWeather learning centre, assisting in the understanding of meteorological concepts with a focus on New Zealand.
We've started our #TCHarold blog on our website. Feel free to provide comments and additional info, or just say thanks: https://weather.net.nz#CycloneHarold #HaroldHomeweather.net.nzWeather learning c...
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APR
05
0

Spectacular ship tracks visible in the marine layer over the North Pacific today, Apr 3rd » Severe Weather Europewww.severe-weather.euSome pretty spectacular sight over the North Pacific ocean today – ship tracks. These narrow clouds are formed along the exhaust of the traveling ships across the ocean. Ship tracks are best seen on the visible satellite channel. Note: Ship tracks are low/mid-level clouds that form around the exha...

Spectacular ship tracks visible in the marine layer over the North Pacific today, Apr 3rd » Severe Weather Europewww.severe-weather.euSome pretty spectacular sight over the North Pacific ocean today – ship tracks. These narrow clouds are formed along the exhaust of the traveling ships across the ocean. Ship tracks are best seen on the visible satellite channel. Note: Ship tracks are low/mid-level clouds that form around the exha...
Spectacular ship tracks visible in the marine layer over the North Pacific today, Apr 3rd » Severe Weather Europewww.severe-weather.euSome pretty spectacular sight over the North Pacific ocean today –...
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APR
05
0

Photos from Fiji Meteorological Service's post

Photos from Fiji Meteorological Service's post
Photos from Fiji Meteorological Service's post
APR
05
0

Shock news!PRESS RELEASE: 4/1/2020. HAYWARD, CA The American Weather Association today announced its decision to abandon the professional title of Meteorologist. After years of dealing with misspellings of the word, and with people believing that meteorologists are experts on meteors rather than weather, the association made the surprising move. Experts in the field of weather will now be known as the Atmospheric Professional Resource Investigative Liaison: Forecasting Ongoing Open Laminar Sky Development and Yougs. "We think this better describes what we do," said Frosty Grauple, the Association's PR Director. "It may be a mouthful, but we encourage our members to just use the acronym."

Shock news!PRESS RELEASE: 4/1/2020. HAYWARD, CA  
The American Weather Association today announced its decision to abandon the professional title of Meteorologist. After years of dealing with misspellings of the word, and with people believing that meteorologists are experts on meteors rather than weather, the association made the surprising move.  
Experts in the field of weather will now be known as the Atmospheric Professional Resource Investigative Liaison: Forecasting Ongoing Open Laminar Sky Development and Yougs.  
"We think this better describes what we do," said Frosty Grauple, the Association's PR Director. "It may be a mouthful, but we encourage our members to just use the acronym."
Shock news!PRESS RELEASE: 4/1/2020. HAYWARD, CA The American Weather Association today announced its decision to abandon the professional title of Meteorologist. After years of dealing with misspellin...
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APR
01
0

Photos from MetService New Zealand's post

Photos from MetService New Zealand's post
Photos from MetService New Zealand's post
MAR
28
0

Weather from your backyardWatch video on Facebook.com

Weather from your backyardWatch video on Facebook.com
MAR
20
0

It's 4:49 pm — the autumnal equinox in the Southern Hemisphere! At the South Pole the sun's disc won't be visible above the horizon until September. In New Zealand, night length will begin to exceed day length until the spring equinox in September. From one of NIWA's researchers in the Arctic (North Pole), where now the sun won't SET until September! >Ben

It's 4:49 pm — the autumnal equinox in the Southern Hemisphere!    
At the South Pole the sun's disc won't be visible above the horizon until September.   
In New Zealand, night length will begin to exceed day length until the spring equinox in September.   
 From one of NIWA's researchers in the Arctic (North Pole), where now the sun won't SET until September!   
>Ben
It's 4:49 pm — the autumnal equinox in the Southern Hemisphere! 🌗 At the South Pole the sun's disc won't be visible above the horizon until September. In New Zealand, night length will begin to exceed...
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MAR
17
0

With transition this morning of TC Gretel to an extratropical low, our blog on Gretel is now complete. You can read it at https://weather.net.nz/2020-tc-tracking/tc-greta #TCGretel #nzweather #nzwx TC Gretelweather.net.nzTropical Cyclone Gretel. March 2020

With transition this morning of TC Gretel to an extratropical low, our blog on Gretel is now complete. You can read it at https://weather.net.nz/2020-tc-tracking/tc-greta #TCGretel #nzweather #nzwx TC Gretelweather.net.nzTropical Cyclone Gretel. March 2020
With transition this morning of TC Gretel to an extratropical low, our blog on Gretel is now complete. You can read it at https://weather.net.nz/2020-tc-tracking/tc-greta #TCGretel #nzweather #nzwxTC ...
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MAR
17
0

Here's something that's a worthwhile cause. If you have a computer and a bit of time why not help out? Volunteers needed to unlock historic weather secretsniwa.co.nzNIWA climate scientists are asking for volunteers to help give its historic weather project a quick, sharp boost.

Here's something that's a worthwhile cause. If you have a computer and a bit of time  why not help out? Volunteers needed to unlock historic weather secretsniwa.co.nzNIWA climate scientists are asking for volunteers to help give its historic weather project a quick, sharp boost.
Here's something that's a worthwhile cause. If you have a computer and a bit of time why not help out?Volunteers needed to unlock historic weather secretsniwa.co.nzNIWA climate scientists are asking f...
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MAR
16
0

Photos from MetService New Zealand's post

Photos from MetService New Zealand's post
Photos from MetService New Zealand's post
MAR
16
0

Fiji Meteorological Servicet.coThe forecast path shown above is the Nadi's best estimate of the cyclone's future movement and intensity. There is always some uncertainty associated with tropical cyclone forecasting and the grey zone indicates the range of likely tracks.

Fiji Meteorological Servicet.coThe forecast path shown above is the Nadi's best estimate of the cyclone's future movement and intensity. There is always some uncertainty associated with tropical cyclone forecasting and the grey zone indicates the range of likely tracks.
Fiji Meteorological Servicet.coThe forecast path shown above is the Nadi's best estimate of the cyclone's future movement and intensity. There is always some uncertainty associated with tropical cyclo...
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MAR
15
0

TC Gretel has been named. You can follow our blog over the next few days on the weather.net.nz site TC Gretelweather.net.nzTropical Cyclone Gretel. March 2020

TC Gretel has been named. You can follow our blog over the next few days on the weather.net.nz site TC Gretelweather.net.nzTropical Cyclone Gretel. March 2020
TC Gretel has been named. You can follow our blog over the next few days on the weather.net.nz siteTC Gretelweather.net.nzTropical Cyclone Gretel. March 2020
MAR
11
0

A new depression has developed over North Australia and is currently moving into the Coral Sea. It's likely this will affect NZ's weather next week as an ex TC. Models for this are already well aligned in terms of path, so we've started a blog already, which includes a video showing the Tropical Depression develop into a TC, as it picks up significant energy over the Coral Sea. You can follow the blog here: https://weather.net.nz/2020-tc-tracking/tc-greta TC Greta (TBC)weather.net.nzA tropical depression is currently forming over North Eastern Australia. This is expected to develop into a Tropical Cyclone over the next 48-72 hours, and if it does will be call TC Greta. ...

A new depression has developed over North Australia and is currently moving into the Coral Sea. It's likely this will affect NZ's  weather next week as an ex TC.  Models for this are already well aligned in terms of path, so we've started a blog already, which includes a video showing the Tropical Depression  develop into a TC, as it picks up significant energy over the Coral Sea. You can follow the blog here: https://weather.net.nz/2020-tc-tracking/tc-greta TC Greta (TBC)weather.net.nzA tropical depression is currently forming over North Eastern Australia. This is expected to develop into a Tropical Cyclone over the next 48-72 hours, and if it does will be call TC Greta.&nbsp...
A new depression has developed over North Australia and is currently moving into the Coral Sea. It's likely this will affect NZ's weather next week as an ex TC. Models for this are already well aligne...
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MAR
10
0

Nice CB's building over Lower Hutt today Taken from Maungaraki School looking North

Nice CB's building over Lower Hutt today Taken from Maungaraki School looking North
FEB
22
0

TC Vicky managed to get no love over the last 24 hours, and is now no longer a TC. However TC Wasi has now formed. You can follow it on our blog https://weather.net.nz/2020-tc-tracking/td10f-tc-wasi #TCWasi #TCVicky TD10F / TC Wasiweather.net.nz22nd February 2020 1900Hot on the heals of TC Vicky, TC Wasi has now been named. It's likely to follow a similar path. Fiji Meteorological Service has made the following details available.TROPICAL DIS...

TC Vicky managed to get no love over the last 24 hours, and is now no longer a TC. However TC Wasi has now formed. You can follow it on our blog https://weather.net.nz/2020-tc-tracking/td10f-tc-wasi #TCWasi #TCVicky TD10F / TC Wasiweather.net.nz22nd February 2020 1900Hot on the heals of TC Vicky, TC Wasi has now been named. It's likely to follow a similar path. Fiji Meteorological Service has made the following details available.TROPICAL DIS...
TC Vicky managed to get no love over the last 24 hours, and is now no longer a TC. However TC Wasi has now formed. You can follow it on our blog https://weather.net.nz/2020-tc-tracking/td10f-tc-wasi#T...
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FEB
21
0

TD07F was declared by the Fiji Meteorological service at 11:30am this morning, as TC Vicky. Two other tropical disturbances TD08F and TD09F have also been identified, but as all three are in close proximity of each other, there is doubt over which will become TC's You can follow our blog on Vicky, on our website: https://weather.net.nz/2020-tc-tracking/td07f-tc-vicky TD07F / TC Vickyweather.net.nz21st February 2020 2000Tropical disturbance 07F was named as TC Vicky, at 11:30am this morning. Currently TC Vicky is a Cat 1 storm. You can follow the transition from Tropical disturbance to Tropical...

TD07F was declared by the Fiji Meteorological service at 11:30am this morning, as TC Vicky. Two other tropical disturbances TD08F and TD09F have also been identified, but as all three are in close proximity of each other, there is doubt over which will become TC's You can follow our blog on Vicky, on our website: https://weather.net.nz/2020-tc-tracking/td07f-tc-vicky TD07F / TC Vickyweather.net.nz21st February 2020 2000Tropical disturbance 07F was named as TC Vicky, at 11:30am this morning. Currently TC Vicky is a Cat 1 storm. You can follow the transition from Tropical disturbance to Tropical...
TD07F was declared by the Fiji Meteorological service at 11:30am this morning, as TC Vicky. Two other tropical disturbances TD08F and TD09F have also been identified, but as all three are in close pro...
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FEB
21
0

Meteorologists frequently refer to thermodynamic diagrams called "Tephigrams". These show the vertical distribution of temperature, moisture and winds in the atmosphere over a place and at a specific time. The diagram can comprise pure model data from sophisticated computer models or they may be a snapshot of the atmosphere over a particular place made up of actual readings made by a weather balloon carrying a small radiosonde and launched over a particular location. As the balloon ascends the radiosonde transmits its precise location from an on board GPS locator, it also transmits its temperature and relative humidity from tiny probes on board, and its pressure as read by an on board miniature aneroid barometer. By knowing the radiosonde's precise location in time and space its is easy to calculate the wind and each level of the atmosphere as it ascends. The radiosonde data is streamed constantly to a receiving station (from where the balloon was released) and then coded into a standard format before being sent around the globe by a sophisticated global telecommunications system (GTS). Radiosonde data is ingested into computer model systems, together with surface observations, satellite, aircraft, ship and ocean buoy data to assist with the production of short term and long term weather forecasts. Such data from all around the globe is facilitated by the World Meteorological Organisation's global data monitoring system - an international border-free exchange of weather information. In the image we can see on the left a cross-section of the the atmosphere over the lower North Island as observed by the Paraparaumu balloon flight which was launched around midnight last night. The tephigram from the balloon flight shows the winds on the right hand side as barbs, showing that the winds were all pretty much blowing from west to northwest with speeds between around 35-65km/h. Also on the tephigram we see two traces, the air temperature (on the right) and the dew-point temperature, derived from the humidity as measured by the radiosonde (on the left). Where the temperature and dew-point are close together, the diagram indicates clouds in the atmosphere. On the right hand side we see an image captured by the Masterton webcam. I have indicated the clouds on the webcam corresponding to their positions on the Paraparaumu tephigram and there is very good agreement. The heights of each cloud layer as seen on the webcam are labeled on each arrow, which corresponds to their position on the tephigram. Read more about clouds and the tephigram at https://blog.metservice.com/breaking-waves-in-the-sky ^AB

Meteorologists frequently refer to thermodynamic diagrams called "Tephigrams". These show the vertical distribution of temperature, moisture and winds in the atmosphere over a place and at a specific time. The diagram can comprise pure model data from sophisticated computer models or they may be a snapshot of the atmosphere over a particular place made up of actual readings made by a weather balloon carrying a small radiosonde and launched over a particular location.   
As the balloon ascends the radiosonde transmits its precise location from an on board GPS locator, it also transmits its temperature and relative humidity from tiny probes on board, and its pressure as read by an on board miniature aneroid barometer. By knowing the radiosonde's precise location in time and space its is easy to calculate the wind and each level of the atmosphere as it ascends.   
The radiosonde data is streamed constantly to a receiving station (from where the balloon was released) and then coded into a standard format before being sent around the globe by a sophisticated global telecommunications system (GTS).   
Radiosonde data is ingested into computer model systems, together with surface observations, satellite, aircraft, ship and ocean buoy data to assist with the production of short term and long term weather forecasts. Such data from all around the globe is facilitated by the World Meteorological Organisation's global data monitoring system - an international border-free exchange of weather information.   
In the image we can see on the left a cross-section of the the atmosphere over the lower North Island as observed by the Paraparaumu balloon flight which was launched around midnight last night. The tephigram from the balloon flight shows the winds on the right hand side as barbs, showing that the winds were all pretty much blowing from west to northwest with speeds between around 35-65km/h.   
Also on the tephigram we see two traces, the air temperature (on the right) and the dew-point temperature, derived from the humidity as measured by the radiosonde (on the left). Where the temperature and dew-point are close together, the diagram indicates clouds in the atmosphere.   
On the right hand side we see an image captured by the Masterton webcam. I have indicated the clouds on the webcam  corresponding to their positions on the Paraparaumu tephigram and there is very good agreement. The heights of each cloud layer as seen on the webcam are labeled on each arrow, which corresponds to their position on the tephigram.    
Read more about clouds and the tephigram at https://blog.metservice.com/breaking-waves-in-the-sky ^AB
Meteorologists frequently refer to thermodynamic diagrams called "Tephigrams". These show the vertical distribution of temperature, moisture and winds in the atmosphere over a place and at a specific ...
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FEB
13
0

https://i.stuff.co.nz/national/119481033/cyclone-uesi-will-be-an-extratropical-low-on-arrival-but-still-pretty-powerful Cyclone Uesi will be an extra-tropical low on arrival, but still 'pretty powerful'i.stuff.co.nzParts of New Zealand expected to be hit by "significant" storm system.

https://i.stuff.co.nz/national/119481033/cyclone-uesi-will-be-an-extratropical-low-on-arrival-but-still-pretty-powerful Cyclone Uesi will be an extra-tropical low on arrival, but still 'pretty powerful'i.stuff.co.nzParts of New Zealand expected to be hit by "significant" storm system.
https://i.stuff.co.nz/national/119481033/cyclone-uesi-will-be-an-extratropical-low-on-arrival-but-still-pretty-powerfulCyclone Uesi will be an extra-tropical low on arrival, but still 'pretty powerful...
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Latest update to #TD06F now renamed to #CycloneUesi at https://weather.net.nz/latest-news-blog/news-feeds/watches-and-warnings/entry/td06f-tc-uesi TD06F / TC Uesiweather.net.nzSaturday 8th February 2020 - 10 pmCurrently named TD06F, a tropical low exists currently situated north of New Caledonia and west of Vanuatu. The future track of this low is uncertain, however t...

Latest update to #TD06F now renamed to #CycloneUesi at https://weather.net.nz/latest-news-blog/news-feeds/watches-and-warnings/entry/td06f-tc-uesi TD06F / TC Uesiweather.net.nzSaturday 8th February 2020 - 10 pmCurrently named TD06F, a tropical low exists currently situated north of New Caledonia and west of Vanuatu. The future track of this low is uncertain, however t...
Latest update to #TD06F now renamed to #CycloneUesi at https://weather.net.nz/latest-news-blog/news-feeds/watches-and-warnings/entry/td06f-tc-uesiTD06F / TC Uesiweather.net.nzSaturday 8th February 202...
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We have started a blog on Tropical Depression 06F which is expected to become a TC over the next day or so. Check out the details and check back regularly for our updates. TD06Fweather.net.nzSaturday 8th February 2020 - 10 pmCurrently named TD06F, a tropical low exists currently situated north of New Caledonia and west of Vanuatu. The future track of this low is uncertain, however t...

We have started a blog on Tropical Depression 06F which is expected to become a TC over the next day or so. Check out the details and check back regularly for our updates. TD06Fweather.net.nzSaturday 8th February 2020 - 10 pmCurrently named TD06F, a tropical low exists currently situated north of New Caledonia and west of Vanuatu. The future track of this low is uncertain, however t...
We have started a blog on Tropical Depression 06F which is expected to become a TC over the next day or so. Check out the details and check back regularly for our updates.TD06Fweather.net.nzSaturday 8...
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Watching this one. If it moves to a TC then it will go in our TC blog on weather.net.nzConditions over the Coral Sea and Southwest Pacific are expected to become favourable for tropical cyclone activity this weekend. This mornings streamline analysis shows a tropical low west-northwest of Vanuatu which is expected to intensify over the weekend. You can read more about current tropical cyclone activity on our website at https://bit.ly/TropicalCycloneActivity ^Tahlia

Watching this one. If it moves to a TC then it will go in our TC blog on weather.net.nzConditions over the Coral Sea and Southwest Pacific are expected to become favourable for tropical cyclone activity this weekend. This mornings streamline analysis shows a tropical low west-northwest of Vanuatu which is expected to intensify over the weekend.   
You can read more about current tropical cyclone activity on our website at https://bit.ly/TropicalCycloneActivity ^Tahlia
Watching this one. If it moves to a TC then it will go in our TC blog on weather.net.nzConditions over the Coral Sea and Southwest Pacific are expected to become favourable for tropical cyclone activi...
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FEB
02
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Winds of change...Watch video on Facebook.com

Winds of change...Watch video on Facebook.com
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‪New Zealand's top-10 temps on record ‬ ‪We'll be watching closely to see if any of these values are tied or topped over the next several days.‬ Extremely hot conditions are expected across the east of both islands on Sunday-Monday, continuing in the North Island on Tuesday. >Ben

‪New Zealand's top-10 temps on record ‬   
‪We'll be watching closely to see if any of these values are tied or topped over the next several days.‬   
Extremely hot conditions are expected across the east of both islands on Sunday-Monday, continuing in the North Island on Tuesday.   
>Ben
‪New Zealand's top-10 temps on record 🌡‬ ‪We'll be watching closely to see if any of these values are tied or topped over the next several days.‬ Extremely hot conditions are expected across the east ...
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02
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Polar vortex: What is it, and why you should care?www.severe-weather.euEvery winter, we often hear the term “polar vortex” in various media. Some call it a stratospheric hurricane, some call every winter storm a polar vortex and some even say it is a huge storm high above in the atmosphere. We are going to take a look at the actual polar vortex, what it really is a...

Polar vortex: What is it, and why you should care?www.severe-weather.euEvery winter, we often hear the term “polar vortex” in various media. Some call it a stratospheric hurricane, some call every winter storm a polar vortex and some even say it is a huge storm high above in the atmosphere. We are going to take a look at the actual polar vortex, what it really is a...
Polar vortex: What is it, and why you should care?www.severe-weather.euEvery winter, we often hear the term “polar vortex” in various media. Some call it a stratospheric hurricane, some call every win...
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FEB
02
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Meet SAMUnderstanding the SAMWatch video on Facebook.com

Meet SAMUnderstanding the SAMWatch video on Facebook.com
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Why Hurricane Dorian Has Stalled Over the Bahamaswww.forbes.comThe science of why Hurricane Dorian has stalled near the Bahamas

Why Hurricane Dorian Has Stalled Over the Bahamaswww.forbes.comThe science of why Hurricane Dorian has stalled near the Bahamas
Why Hurricane Dorian Has Stalled Over the Bahamaswww.forbes.comThe science of why Hurricane Dorian has stalled near the Bahamas
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Sudden Stratospheric Warming 101Watch video on Facebook.com

Sudden Stratospheric Warming 101Watch video on Facebook.com
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Looks interestingThe Power Of WeatherWatch video on Facebook.com

Looks interestingThe Power Of WeatherWatch video on Facebook.com
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Watch video on Facebook.com

Watch video on Facebook.com
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02
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A fascination for our local NW arch and its uniqueness were one of the things that developed an interest for me as a kid in meteorology. What was it that got you started?Strong northwesterly winds across the South Island today, in combination with lots of mid to high level moisture have made for ideal conditions to form a classic Northwest Arch cloud east of the South Island ranges. Beneath the "Arch", waves have developed Asperatus clouds (sometimes called "Asperitas") a wave-like formation and a relatively newly named sub-species of cloud. You can find out more about these clouds in the WMO International online cloud atlas here https://cloudatlas.wmo.int/clouds-supplementary-features-asperitas.html This image shows the Asperatus cloud features observed this morning on the webcam near Timaru and beneath the webcam image is a True Colour Satellite image of the sharp Arch cloud east of the Divide. Thanks to JMA (Japan Meteorological Agency) for the image. ^AB

A fascination for our local NW arch and its uniqueness were one of the things that developed an interest for me as a kid in meteorology. What was it that got you started?Strong northwesterly winds across the South Island today, in combination with lots of mid to high level moisture have made for ideal conditions to form a classic Northwest Arch cloud east of the South Island ranges.   
Beneath the "Arch", waves have developed Asperatus clouds (sometimes called "Asperitas")  a wave-like formation and a relatively newly named sub-species of cloud.   
You can find out more about these clouds in the WMO International online cloud atlas here https://cloudatlas.wmo.int/clouds-supplementary-features-asperitas.html   
This image shows the Asperatus cloud features observed this morning on the webcam near Timaru and beneath the webcam image is a True Colour Satellite image of the sharp Arch cloud east of the Divide. Thanks to JMA (Japan Meteorological Agency) for the image. ^AB
A fascination for our local NW arch and its uniqueness were one of the things that developed an interest for me as a kid in meteorology. What was it that got you started?Strong northwesterly winds acr...
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02
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Photos from Napier City Council's post

Photos from Napier City Council's post
Photos from Napier City Council's post
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02
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Photos from NZ Stormchasers's post

Photos from NZ Stormchasers's post
Photos from NZ Stormchasers's post
FEB
02
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What is a Tropical Cyclone?

What is a Tropical Cyclone?
What is a Tropical Cyclone?
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02
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Trick or Treat weather forecast 2019Watch video on Facebook.com

Trick or Treat weather forecast 2019Watch video on Facebook.com
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Understanding storm surgeWatch video on Facebook.com

Understanding storm surgeWatch video on Facebook.com
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02
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Check out the blog post about TC Tino on our website. Feel free to add comments, or your own info in the comments section. We will be adding more content over the next few days so check back often https://weather.net.nz/latest-news-blog/news-feeds/watches-and-warnings/entry/td04f-cyclone-tino

Check out the blog post about TC Tino on our website. Feel free to add comments, or your own info in the comments section. We will be adding more content over the next few days so check back often https://weather.net.nz/latest-news-blog/news-feeds/watches-and-warnings/entry/td04f-cyclone-tino
Check out the blog post about TC Tino on our website. Feel free to add comments, or your own info in the comments section. We will be adding more content over the next few days so check back oftenhttp...
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02
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Invest #93P is revealing explosive convection with -90 °C cloud tops, models are in agreement it will organize and head towards Fiji » Severe Weather Europewww.severe-weather.eu-spread the word- A gradually organizing Invest #93P in the South Pacific is delivering some exceptional satellite imagery, locally pushing cloud tops to around -90 °C! That’s extremely high! #93P is on track with its future behavior, expected to pass very near the Fiji archipelago in the coming ...

Invest #93P is revealing explosive convection with -90 °C cloud tops, models are in agreement it will organize and head towards Fiji » Severe Weather Europewww.severe-weather.eu-spread the word- A gradually organizing Invest #93P in the South Pacific is delivering some exceptional satellite imagery, locally pushing cloud tops to around -90 °C! That’s extremely high! #93P is on track with its future behavior, expected to pass very near the Fiji archipelago in the coming ...
Invest #93P is revealing explosive convection with -90 °C cloud tops, models are in agreement it will organize and head towards Fiji » Severe Weather Europewww.severe-weather.eu-spread the word- A gra...
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FEB
02
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New Zealand Weather Network updated their business hours.www.facebook.com

New Zealand Weather Network updated their business hours.www.facebook.com
New Zealand Weather Network updated their business hours.www.facebook.com
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02
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Photos from NIWA Weather's post

Photos from NIWA Weather's post
Photos from NIWA Weather's post
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Loving the late night images of New Zealand's Milford Sound. These images taken 10:04pm on Monday 23rd December 2019 - you can still see the blue sky! In Wellington it's been dark for about 30 minsPhotos from New Zealand Weather Network's post

Loving the late night images of New Zealand's Milford Sound. These images taken 10:04pm on Monday 23rd December 2019 - you can still see the blue sky! In Wellington it's been dark for about 30 minsPhotos from New Zealand Weather Network's post
Loving the late night images of New Zealand's Milford Sound. These images taken 10:04pm on Monday 23rd December 2019 - you can still see the blue sky! In Wellington it's been dark for about 30 minsPho...
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https://facebook.com/events/561777137731820/?ti=as One for all you budding photographers. We would love to see your efforts on our website www.weather.net.nz. You may even get your photo on our seasonal header for our site. Homewww.weather.net.nzWeather learning centre, assisting in the understanding of meteorological concepts with a focus on New Zealand.

https://facebook.com/events/561777137731820/?ti=as   
One for all you budding photographers. We would  love to see your efforts on our website www.weather.net.nz. You may even get your photo on our seasonal header for our site. Homewww.weather.net.nzWeather learning centre, assisting in the understanding of meteorological concepts with a focus on New Zealand.
https://facebook.com/events/561777137731820/?ti=as One for all you budding photographers. We would love to see your efforts on our website www.weather.net.nz. You may even get your photo on our season...
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FEB
02
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That's warmish...JUST IN: 38.2 degrees in Gisborne, the town's hottest temperature on record (since 1940) and New Zealand's hottest temperature this summer ️ This is the warmest temperature in NZ this summer and provisionally the 19th-hottest temperature observed in New Zealand on record AND the 5th-hottest January temperature observed in New Zealand on record. As of 4:00 pm, the temperature was still climbing... >Ben

That's warmish...JUST IN: 38.2 degrees in Gisborne, the town's hottest temperature on record (since 1940) and New Zealand's hottest temperature this summer ️   
This is the warmest temperature in NZ this summer and provisionally the 19th-hottest temperature observed in New Zealand on record AND the 5th-hottest January temperature observed in New Zealand on record.    
As of 4:00 pm, the temperature was still climbing...   
>Ben
That's warmish...JUST IN: 38.2 degrees in Gisborne, the town's hottest temperature on record (since 1940) and New Zealand's hottest temperature this summer 🌡️ This is the warmest temperature in NZ thi...
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