Pieter Groenemeijer 🇪🇺
@pietergroenemeijer.bsky.social
Meteorology, Dr. Physics, husband, 3 daughters. Researcher and director at European Severe Storms Lab.
Forecasting extreme events 🌪⚡. Pro democracy and rule of law, of course.
Forecasting extreme events 🌪⚡. Pro democracy and rule of law, of course.
Reposted by Pieter Groenemeijer 🇪🇺
I’m very happy to be in Utrecht, The Netherlands, for the 12th European Conference on Severe Storms #ECSS2025 run by @essl-ecss.bsky.social and supported by @knmi.nl and @eumetsat.int. Here, @pietergroenemeijer.bsky.social opens the conference. Lots of exciting science to discuss this week!
November 17, 2025 at 8:36 AM
I’m very happy to be in Utrecht, The Netherlands, for the 12th European Conference on Severe Storms #ECSS2025 run by @essl-ecss.bsky.social and supported by @knmi.nl and @eumetsat.int. Here, @pietergroenemeijer.bsky.social opens the conference. Lots of exciting science to discuss this week!
Slecht plan. Niet doen. Het KNMi zegt windstoten tot 120 km/u.
October 23, 2025 at 8:36 AM
Slecht plan. Niet doen. Het KNMi zegt windstoten tot 120 km/u.
Reposted by Pieter Groenemeijer 🇪🇺
The TIM field campaign poster at #IMC25 presents the highlights from the TIM White Paper
nhess.copernicus.org/articles/25/26…
Better understanding why severe thunderstorms are most frequent close to mountain ranges and how they intensify will improve warnings for cities too.
nhess.copernicus.org/articles/25/26…
Better understanding why severe thunderstorms are most frequent close to mountain ranges and how they intensify will improve warnings for cities too.
September 15, 2025 at 6:57 AM
The TIM field campaign poster at #IMC25 presents the highlights from the TIM White Paper
nhess.copernicus.org/articles/25/26…
Better understanding why severe thunderstorms are most frequent close to mountain ranges and how they intensify will improve warnings for cities too.
nhess.copernicus.org/articles/25/26…
Better understanding why severe thunderstorms are most frequent close to mountain ranges and how they intensify will improve warnings for cities too.
Reposted by Pieter Groenemeijer 🇪🇺
2025 confirms that August is the #waterspout month par excellence, not only for Germany. #tornado
August 25, 2025 at 4:52 PM
2025 confirms that August is the #waterspout month par excellence, not only for Germany. #tornado
Very well-developed tornadic signatures in radar imagery in France today:
It appears, based on radar, that this supercell highly likely produced 2 more tornadoes, given very convincing looking TDSes and couplets! So that was quite the cyclic supercell! Some individual radar frames and 2 loops, both with and without RGB: streamable.com/i2v99i, streamable.com/8f0ygp
August 29, 2025 at 8:48 PM
Very well-developed tornadic signatures in radar imagery in France today:
Reposted by Pieter Groenemeijer 🇪🇺
Breathtaking video from the 53rd Weather Reconnaissance Squadron of the stadium effect inside the eye of Hurricane Erin from last night’s pass
These observations are crucial for improving forecasts and keeping people safe
These observations are crucial for improving forecasts and keeping people safe
August 16, 2025 at 11:06 PM
Breathtaking video from the 53rd Weather Reconnaissance Squadron of the stadium effect inside the eye of Hurricane Erin from last night’s pass
These observations are crucial for improving forecasts and keeping people safe
These observations are crucial for improving forecasts and keeping people safe
Reposted by Pieter Groenemeijer 🇪🇺
BELARUS - 09 JUL 2025 - TORNADO
IF2 tornado hit Varkhi village (Vitsyebsk region), N Belarus, leaving serious damage to houses and vegetation
@bramvantveen.bsky.social @federicopavan.bsky.social @weatherhistory.bsky.social @sarahhants.bsky.social @rued.com @aaron-stormchase.bsky.social
IF2 tornado hit Varkhi village (Vitsyebsk region), N Belarus, leaving serious damage to houses and vegetation
@bramvantveen.bsky.social @federicopavan.bsky.social @weatherhistory.bsky.social @sarahhants.bsky.social @rued.com @aaron-stormchase.bsky.social
July 9, 2025 at 7:35 PM
BELARUS - 09 JUL 2025 - TORNADO
IF2 tornado hit Varkhi village (Vitsyebsk region), N Belarus, leaving serious damage to houses and vegetation
@bramvantveen.bsky.social @federicopavan.bsky.social @weatherhistory.bsky.social @sarahhants.bsky.social @rued.com @aaron-stormchase.bsky.social
IF2 tornado hit Varkhi village (Vitsyebsk region), N Belarus, leaving serious damage to houses and vegetation
@bramvantveen.bsky.social @federicopavan.bsky.social @weatherhistory.bsky.social @sarahhants.bsky.social @rued.com @aaron-stormchase.bsky.social
Reposted by Pieter Groenemeijer 🇪🇺
"One of the NOAA labs slated to be shut down [in Trump's budget] is the National Severe Storms Lab in Norman, Oklahoma, which works to improve flash flood forecasting among other hazards from severe thunderstorms..."
www.cnn.com/2025/07/05/c...
www.cnn.com/2025/07/05/c...
Beleaguered Weather Service defends its forecasts as Texas officials point fingers over flood warnings | CNN
Texas forecasters issued a series of early-morning warnings about “life-threatening flooding” along the Guadalupe River.
www.cnn.com
July 7, 2025 at 4:29 PM
"One of the NOAA labs slated to be shut down [in Trump's budget] is the National Severe Storms Lab in Norman, Oklahoma, which works to improve flash flood forecasting among other hazards from severe thunderstorms..."
www.cnn.com/2025/07/05/c...
www.cnn.com/2025/07/05/c...
Reposted by Pieter Groenemeijer 🇪🇺
Do not forget the Abstract submission deadline of the upcoming European Conference on Severe Storms ⛈️🌪️⚡next Friday 6 June!
We hope to welcome all researchers and forecasters with an interest in severe storms to Utrecht 🇳🇱 this November 🙂!
Sponsored by @eumetsat.int @eumetsat-users.bsky.social.
We hope to welcome all researchers and forecasters with an interest in severe storms to Utrecht 🇳🇱 this November 🙂!
Sponsored by @eumetsat.int @eumetsat-users.bsky.social.
May 31, 2025 at 2:15 PM
Do not forget the Abstract submission deadline of the upcoming European Conference on Severe Storms ⛈️🌪️⚡next Friday 6 June!
We hope to welcome all researchers and forecasters with an interest in severe storms to Utrecht 🇳🇱 this November 🙂!
Sponsored by @eumetsat.int @eumetsat-users.bsky.social.
We hope to welcome all researchers and forecasters with an interest in severe storms to Utrecht 🇳🇱 this November 🙂!
Sponsored by @eumetsat.int @eumetsat-users.bsky.social.
Reposted by Pieter Groenemeijer 🇪🇺
#Tornade hier à Riedseltz (Bas-Rhin), tout proche de la frontière franco-allemande (images de Sébastien Frank et Fleur Moog via STM 67 Alliance Alsace) :
www.facebook.com/permalink.ph...
www.facebook.com/permalink.ph...
May 29, 2025 at 10:41 AM
#Tornade hier à Riedseltz (Bas-Rhin), tout proche de la frontière franco-allemande (images de Sébastien Frank et Fleur Moog via STM 67 Alliance Alsace) :
www.facebook.com/permalink.ph...
www.facebook.com/permalink.ph...
Reposted by Pieter Groenemeijer 🇪🇺
Happy Europe Day everyone! 🇪🇺
May 9, 2025 at 6:56 AM
Happy Europe Day everyone! 🇪🇺
Reposted by Pieter Groenemeijer 🇪🇺
The 2026 budget passback plan calls for eliminating NOAA Research, the scientific backbone that keeps weather forecasts, alerts, and warnings accurate and effective. This would have disastrous consequences.
Read the AMS statement, in partnership w/ @nwas.org: bit.ly/4cz2RtC
Read the AMS statement, in partnership w/ @nwas.org: bit.ly/4cz2RtC
Stand Up for NOAA Research – The Time to Act is Now
The AMS is a global community committed to advancing weather, water, and climate science and service.
bit.ly
April 17, 2025 at 6:42 PM
The 2026 budget passback plan calls for eliminating NOAA Research, the scientific backbone that keeps weather forecasts, alerts, and warnings accurate and effective. This would have disastrous consequences.
Read the AMS statement, in partnership w/ @nwas.org: bit.ly/4cz2RtC
Read the AMS statement, in partnership w/ @nwas.org: bit.ly/4cz2RtC
Reposted by Pieter Groenemeijer 🇪🇺
This lab makes it possible for the NWS to forecast severe weather at the level we do. They can do much more too. If lost there’s no going back to fix it.
HRRR? RRFS? Those models don’t exist without NOAA’s Global Systems Lab.
The physics used in even more models? Not possible without us.
Decision-support tools like DESI and IDSS Engine used throughout the NWS? Also us.
What my lab does is *integral* to weather prediction and keeping people safe.
The physics used in even more models? Not possible without us.
Decision-support tools like DESI and IDSS Engine used throughout the NWS? Also us.
What my lab does is *integral* to weather prediction and keeping people safe.
April 17, 2025 at 10:43 AM
This lab makes it possible for the NWS to forecast severe weather at the level we do. They can do much more too. If lost there’s no going back to fix it.
AEMet has confirmed that the tragic wind event that caused the loss of three people's lives was indeed a tornado:
Yes indeed. Always impressive to visit the damages caused by a tornado, but this time it has been worse. Our feelings with the three deceased workers.
Visit record and study already available
sinobas.aemet.es/subidos/pdfs...
sinobas.aemet.es/subidos/pdfs...
#IFscale is proving to be very useful.
Visit record and study already available
sinobas.aemet.es/subidos/pdfs...
sinobas.aemet.es/subidos/pdfs...
#IFscale is proving to be very useful.
sinobas.aemet.es
April 16, 2025 at 6:59 AM
AEMet has confirmed that the tragic wind event that caused the loss of three people's lives was indeed a tornado:
These plans will be very bad for forecasting and severe weather research in the US. Money invested in NOAA is extremely well spent, let alone the reduction of impacts on people. I am thinking of my US meteorology colleagues and hope this will not become reality. www.cnn.com/2025/04/11/c...
April 11, 2025 at 8:36 PM
These plans will be very bad for forecasting and severe weather research in the US. Money invested in NOAA is extremely well spent, let alone the reduction of impacts on people. I am thinking of my US meteorology colleagues and hope this will not become reality. www.cnn.com/2025/04/11/c...
Sad news that three people were killed as an agricultural warehouse collapsed close to Seville, Spain, due to a tornado or severe wind gusts: www.diariodesevilla.es/sevilla/muer... @clepsidelia.bsky.social
Tres muertos tras el derrumbe por un posible tornado de una nave agrícola en Coria del Río: "Miré y había volado todo"
Dos de los muertos, de 61 y 59 años, son hermanos y vecinos de Dos Hermanas, y el tercero, de 40, residía en Benacazón
www.diariodesevilla.es
April 5, 2025 at 11:05 AM
Sad news that three people were killed as an agricultural warehouse collapsed close to Seville, Spain, due to a tornado or severe wind gusts: www.diariodesevilla.es/sevilla/muer... @clepsidelia.bsky.social
Reposted by Pieter Groenemeijer 🇪🇺
As we’re gearing up for tornado season, taking weather balloons offline in the Heartland of the US, also known as Tornado Alley, will directly affect the NWS’s ability to predict severe weather, including tornado-producing thunderstorms. This could lead to more severe weather-related deaths.
With Fewer Weather Balloons, People in US Heartland Will Be Less Prepared for Tornado Season
This could lead to more severe weather-related deaths.
blog.ucs.org
March 27, 2025 at 6:51 PM
As we’re gearing up for tornado season, taking weather balloons offline in the Heartland of the US, also known as Tornado Alley, will directly affect the NWS’s ability to predict severe weather, including tornado-producing thunderstorms. This could lead to more severe weather-related deaths.
Reposted by Pieter Groenemeijer 🇪🇺
We agree, but reviewer #2 did not. Here is our figure:
March 17, 2025 at 6:38 PM
We agree, but reviewer #2 did not. Here is our figure:
Reposted by Pieter Groenemeijer 🇪🇺
New ESSL study: Lightning kills about 64 people per year across Europe, 78% of them being men. In eastern Europe most victims were at work, whilst in West Europe people engaging in leisure activities are hit more often. Read more in our article here: journals.ametsoc.org/view/journal...
March 17, 2025 at 9:59 AM
New ESSL study: Lightning kills about 64 people per year across Europe, 78% of them being men. In eastern Europe most victims were at work, whilst in West Europe people engaging in leisure activities are hit more often. Read more in our article here: journals.ametsoc.org/view/journal...
Reposted by Pieter Groenemeijer 🇪🇺
Big day in NE Italy. A friend from northern Italy shared spectacular supercell structure shots with me.
March 15, 2025 at 9:36 PM
Big day in NE Italy. A friend from northern Italy shared spectacular supercell structure shots with me.
Reposted by Pieter Groenemeijer 🇪🇺
Insurers warn that mass firings at NASA, the US Geological Survey and other science agencies could threaten the public weather and geospatial data they use to manage natural disaster risks — and could raise prices for consumers:
on.ft.com/3DI4Q1K
on.ft.com/3DI4Q1K
Insurers warn that US weather agency mass firings will hit climate risk data
[FREE TO READ] Reinsurance trade group appeals to US commerce secretary Lutnick to preserve data collection after thousands of jobs axed
on.ft.com
March 14, 2025 at 12:40 PM
Insurers warn that mass firings at NASA, the US Geological Survey and other science agencies could threaten the public weather and geospatial data they use to manage natural disaster risks — and could raise prices for consumers:
on.ft.com/3DI4Q1K
on.ft.com/3DI4Q1K
Reposted by Pieter Groenemeijer 🇪🇺
Er zijn momenten dat de bescherming van democratie en vrijheid echt zwaarder moet wegen dan partijpolitiek (en uitvluchten over geld). Dit was/is zo’n moment.
March 11, 2025 at 6:42 PM
Er zijn momenten dat de bescherming van democratie en vrijheid echt zwaarder moet wegen dan partijpolitiek (en uitvluchten over geld). Dit was/is zo’n moment.
Reposted by Pieter Groenemeijer 🇪🇺
Alle EU-leiders kozen vorige week voor actieplan om in deze tijd Europa veilig te houden: ReArm Europe.
In hoofdelijke stemming verwerpt de Tweede Kamer zojuist nipt dit plan met steun van PVV, BBB en NSC. Ze gooien daarmee premier Schoof voor de bus en isoleren Nederland.
Oliedom & onverantwoord.
In hoofdelijke stemming verwerpt de Tweede Kamer zojuist nipt dit plan met steun van PVV, BBB en NSC. Ze gooien daarmee premier Schoof voor de bus en isoleren Nederland.
Oliedom & onverantwoord.
March 11, 2025 at 2:40 PM
Alle EU-leiders kozen vorige week voor actieplan om in deze tijd Europa veilig te houden: ReArm Europe.
In hoofdelijke stemming verwerpt de Tweede Kamer zojuist nipt dit plan met steun van PVV, BBB en NSC. Ze gooien daarmee premier Schoof voor de bus en isoleren Nederland.
Oliedom & onverantwoord.
In hoofdelijke stemming verwerpt de Tweede Kamer zojuist nipt dit plan met steun van PVV, BBB en NSC. Ze gooien daarmee premier Schoof voor de bus en isoleren Nederland.
Oliedom & onverantwoord.