Bram van 't Veen
@bramvantveen.bsky.social
Severe storms and radar | Creator of radar viewer NLradar | MSc Climate Physics | Working with radar data for @essl-ecss.bsky.social.
Reposted by Bram van 't Veen
The greatest atmospheric ballet! Large, highly visible snow mesovortices rolling down a convergence band over Lake Michigan on 2024/01/19. Perhaps the most beautiful radar data NEXRAD has ever produced. This is a 14 hour loop showing the ridiculously high number of them that developed sequentially
November 11, 2025 at 1:44 AM
The greatest atmospheric ballet! Large, highly visible snow mesovortices rolling down a convergence band over Lake Michigan on 2024/01/19. Perhaps the most beautiful radar data NEXRAD has ever produced. This is a 14 hour loop showing the ridiculously high number of them that developed sequentially
Reposted by Bram van 't Veen
Appears a destructive tornado struck the city of Rio Bonito do Iguaçu, Paraná, Brazil this afternoon with a severe weather outbreak. Profile from neighboring Argentina shows extreme low level shear for South American standards. 50 kt winds at 1 km AGL. www.facebook.com/reel/1345539...
November 7, 2025 at 10:54 PM
Appears a destructive tornado struck the city of Rio Bonito do Iguaçu, Paraná, Brazil this afternoon with a severe weather outbreak. Profile from neighboring Argentina shows extreme low level shear for South American standards. 50 kt winds at 1 km AGL. www.facebook.com/reel/1345539...
Reposted by Bram van 't Veen
8 months ago I had a vision: what if we had a unified, track-based dataset of all severe events?
Still a lot of improvements I can make to the algorithm itself, but otherwise, looks like we have one now. I can't wait to see what we can do with this 👀
Still a lot of improvements I can make to the algorithm itself, but otherwise, looks like we have one now. I can't wait to see what we can do with this 👀
November 7, 2025 at 7:42 PM
8 months ago I had a vision: what if we had a unified, track-based dataset of all severe events?
Still a lot of improvements I can make to the algorithm itself, but otherwise, looks like we have one now. I can't wait to see what we can do with this 👀
Still a lot of improvements I can make to the algorithm itself, but otherwise, looks like we have one now. I can't wait to see what we can do with this 👀
Reposted by Bram van 't Veen
Tornado tracks by rating (left) and duration (right)
While highly rated/long-tracked tornadoes are biased towards the Southeast, long-duration tors are found even up to the High Plains.
Credit to @theasandmael.bsky.social for her incredible dataset!!
While highly rated/long-tracked tornadoes are biased towards the Southeast, long-duration tors are found even up to the High Plains.
Credit to @theasandmael.bsky.social for her incredible dataset!!
November 6, 2025 at 4:35 PM
Tornado tracks by rating (left) and duration (right)
While highly rated/long-tracked tornadoes are biased towards the Southeast, long-duration tors are found even up to the High Plains.
Credit to @theasandmael.bsky.social for her incredible dataset!!
While highly rated/long-tracked tornadoes are biased towards the Southeast, long-duration tors are found even up to the High Plains.
Credit to @theasandmael.bsky.social for her incredible dataset!!
Reposted by Bram van 't Veen
🌪️Publication du rapport sur la tornade qui a frappé le Val-d'Oise le 20 octobre : urlr.me/kbHN6A Intensité EF2 et trajectoire totale de 21 km. 4 autres tornades ont été observées le même jour ; les rapports viennent d'être publiés également.
November 2, 2025 at 9:50 AM
🌪️Publication du rapport sur la tornade qui a frappé le Val-d'Oise le 20 octobre : urlr.me/kbHN6A Intensité EF2 et trajectoire totale de 21 km. 4 autres tornades ont été observées le même jour ; les rapports viennent d'être publiés également.
Late yesterday evening featured some strongly rotating storms over the Irish Sea, which were nicely captured by the Dublin radar. Had they occurred over land, we would likely have seen tornado reports.
November 1, 2025 at 5:57 PM
Late yesterday evening featured some strongly rotating storms over the Irish Sea, which were nicely captured by the Dublin radar. Had they occurred over land, we would likely have seen tornado reports.
Reposted by Bram van 't Veen
OTD in 1964 one of Sicily's black tornado days: a first twister developed in the sea and impacted the town of Santa Croce Camerina, where it killed 5 people and injured 70+. Cars were lofted and homes/farms destroyed (rating pending, further documentation can be gathered)
October 31, 2025 at 10:34 AM
OTD in 1964 one of Sicily's black tornado days: a first twister developed in the sea and impacted the town of Santa Croce Camerina, where it killed 5 people and injured 70+. Cars were lofted and homes/farms destroyed (rating pending, further documentation can be gathered)
Reposted by Bram van 't Veen
NEW: Devastating imagery from Jamaica, before & after Category 5 Hurricane Melissa.
Black River — near total destruction.
Black River — near total destruction.
October 29, 2025 at 8:28 PM
NEW: Devastating imagery from Jamaica, before & after Category 5 Hurricane Melissa.
Black River — near total destruction.
Black River — near total destruction.
Reposted by Bram van 't Veen
Multi-panel view of the last few days of Hurricane Melissa:
↖️ GOES-19 infrared brightness temp
↗️ GOES-19 visible satellite
↙️ Hurricane hunter planes & flight paths
↘️ Recon-derived flight level wind swath
⬇️ Estimated minimum pressure from recon dropsondes
↖️ GOES-19 infrared brightness temp
↗️ GOES-19 visible satellite
↙️ Hurricane hunter planes & flight paths
↘️ Recon-derived flight level wind swath
⬇️ Estimated minimum pressure from recon dropsondes
October 29, 2025 at 10:14 PM
Multi-panel view of the last few days of Hurricane Melissa:
↖️ GOES-19 infrared brightness temp
↗️ GOES-19 visible satellite
↙️ Hurricane hunter planes & flight paths
↘️ Recon-derived flight level wind swath
⬇️ Estimated minimum pressure from recon dropsondes
↖️ GOES-19 infrared brightness temp
↗️ GOES-19 visible satellite
↙️ Hurricane hunter planes & flight paths
↘️ Recon-derived flight level wind swath
⬇️ Estimated minimum pressure from recon dropsondes
Reposted by Bram van 't Veen
Annotating a long 3+ day loop of #Hurricane #Melissa from Kingston, #Jamaica radar.
2️⃣ periods appear where an eyewall replacement cycle, #ERC, looked underway. In both cases, inner eyewall stayed intact & outer bands merged, resulting in a larger eye & strengthening after.
A remarkable evolution 🌀
2️⃣ periods appear where an eyewall replacement cycle, #ERC, looked underway. In both cases, inner eyewall stayed intact & outer bands merged, resulting in a larger eye & strengthening after.
A remarkable evolution 🌀
October 30, 2025 at 6:54 AM
Annotating a long 3+ day loop of #Hurricane #Melissa from Kingston, #Jamaica radar.
2️⃣ periods appear where an eyewall replacement cycle, #ERC, looked underway. In both cases, inner eyewall stayed intact & outer bands merged, resulting in a larger eye & strengthening after.
A remarkable evolution 🌀
2️⃣ periods appear where an eyewall replacement cycle, #ERC, looked underway. In both cases, inner eyewall stayed intact & outer bands merged, resulting in a larger eye & strengthening after.
A remarkable evolution 🌀
The start point of the path here nicely matches up with the location where the presumed TDS first appeared, increasing confidence that it was indeed a TDS.
Note by the way that the strong looking couplet on the third image is a dealiasing failure. First image provides most useful doppler data.
Note by the way that the strong looking couplet on the third image is a dealiasing failure. First image provides most useful doppler data.
October 28, 2025 at 8:47 AM
The start point of the path here nicely matches up with the location where the presumed TDS first appeared, increasing confidence that it was indeed a TDS.
Note by the way that the strong looking couplet on the third image is a dealiasing failure. First image provides most useful doppler data.
Note by the way that the strong looking couplet on the third image is a dealiasing failure. First image provides most useful doppler data.
Reposted by Bram van 't Veen
🟢 Am 23.10.2025 zog ein #Tornado durch #Siebersbach bei #Sulzbach an der #Murr (Baden-#Württemberg). Es kam zu teils erheblichen Sach- und Vegetationsschäden entlang einer über einen Kilometer langen Schneise, die das #Lautertal quert.
⬇️ Analyse:
www.torkud.de/post/vsieber...
⬇️ Analyse:
www.torkud.de/post/vsieber...
October 28, 2025 at 7:04 AM
🟢 Am 23.10.2025 zog ein #Tornado durch #Siebersbach bei #Sulzbach an der #Murr (Baden-#Württemberg). Es kam zu teils erheblichen Sach- und Vegetationsschäden entlang einer über einen Kilometer langen Schneise, die das #Lautertal quert.
⬇️ Analyse:
www.torkud.de/post/vsieber...
⬇️ Analyse:
www.torkud.de/post/vsieber...
Reposted by Bram van 't Veen
October 27th, 1913:
An outbreak of at least eight tornadoes impacted England and Wales. One tornado caused estimated F3 damage to the Taff Valley towns of Abercynon and Edwardsville, where many houses were unroofed.
1/2
An outbreak of at least eight tornadoes impacted England and Wales. One tornado caused estimated F3 damage to the Taff Valley towns of Abercynon and Edwardsville, where many houses were unroofed.
1/2
October 27, 2025 at 12:20 PM
October 27th, 1913:
An outbreak of at least eight tornadoes impacted England and Wales. One tornado caused estimated F3 damage to the Taff Valley towns of Abercynon and Edwardsville, where many houses were unroofed.
1/2
An outbreak of at least eight tornadoes impacted England and Wales. One tornado caused estimated F3 damage to the Taff Valley towns of Abercynon and Edwardsville, where many houses were unroofed.
1/2
Possible tornado in SW Germany yesterday. And possibly with a radar-detected TDS, as there is a small CC hole at the location of reported damage.
At least this CC hole is not from ground clutter (as is the case for quite some of the green spots in the RGB), as it's not visible at surrounding times.
At least this CC hole is not from ground clutter (as is the case for quite some of the green spots in the RGB), as it's not visible at surrounding times.
October 24, 2025 at 9:56 AM
Possible tornado in SW Germany yesterday. And possibly with a radar-detected TDS, as there is a small CC hole at the location of reported damage.
At least this CC hole is not from ground clutter (as is the case for quite some of the green spots in the RGB), as it's not visible at surrounding times.
At least this CC hole is not from ground clutter (as is the case for quite some of the green spots in the RGB), as it's not visible at surrounding times.
Reposted by Bram van 't Veen
D'autres tornades en France hier ?
La tornade meurtrière d'Ermont a largement été couverte par les médias, et c'est bien normal. Mais celle-ci ne doit pas occulter d'autres événements survenus hier et qui méritent notre attention. Thread à dérouler :
La tornade meurtrière d'Ermont a largement été couverte par les médias, et c'est bien normal. Mais celle-ci ne doit pas occulter d'autres événements survenus hier et qui méritent notre attention. Thread à dérouler :
Redirecting...
www.facebook.com
October 21, 2025 at 8:21 PM
D'autres tornades en France hier ?
La tornade meurtrière d'Ermont a largement été couverte par les médias, et c'est bien normal. Mais celle-ci ne doit pas occulter d'autres événements survenus hier et qui méritent notre attention. Thread à dérouler :
La tornade meurtrière d'Ermont a largement été couverte par les médias, et c'est bien normal. Mais celle-ci ne doit pas occulter d'autres événements survenus hier et qui méritent notre attention. Thread à dérouler :
Radar loop of the low-topped supercell that produced yesterday's deadly tornado in France: streamable.com/wpo049. The lack of the nearby Trappes radar sadly meant that the storm wasn't sampled below 2 km AGL, which is quite a limitation. But we can see a clear supercell structure with mesocyclone.
October 21, 2025 at 2:03 PM
Radar loop of the low-topped supercell that produced yesterday's deadly tornado in France: streamable.com/wpo049. The lack of the nearby Trappes radar sadly meant that the storm wasn't sampled below 2 km AGL, which is quite a limitation. But we can see a clear supercell structure with mesocyclone.
Reposted by Bram van 't Veen
Tornadoes in France today. At least one death and 9 injuries, unfortunate but somewhat inevitable when a significant tornado (seems to be at least an IF2 to me) strikes such a populated area. Europe has a severe lack of tornado awareness and when a violent one will strike a highly populated area...
Oh, that's interesting ! So far, we have two tornadoes for today, but not on those locations !
The first one in Ermont/Eaubonne : www.facebook.com/1284867853/v...
The first one in Ermont/Eaubonne : www.facebook.com/1284867853/v...
Isabelle Lesot Yvart on Reels
www.facebook.com
October 20, 2025 at 7:15 PM
Tornadoes in France today. At least one death and 9 injuries, unfortunate but somewhat inevitable when a significant tornado (seems to be at least an IF2 to me) strikes such a populated area. Europe has a severe lack of tornado awareness and when a violent one will strike a highly populated area...
We are not yet done in France. Strong rotation near Metz now, suggesting tornado potential. I'm also seeing a small CC minimum for 2 scans now, which might be a small TDS.
October 20, 2025 at 8:17 PM
We are not yet done in France. Strong rotation near Metz now, suggesting tornado potential. I'm also seeing a small CC minimum for 2 scans now, which might be a small TDS.
Reposted by Bram van 't Veen
The second one in Chaumont-en-Vexin :
www.facebook.com/groups/18707...
www.facebook.com/groups/18707...
CHAUMONT EN VEXIN & CO | Facebook
www.facebook.com
October 20, 2025 at 6:01 PM
The second one in Chaumont-en-Vexin :
www.facebook.com/groups/18707...
www.facebook.com/groups/18707...
An additional tornado suspect from Belgium: www.vrt.be/vrtnws/nl/20.... The responsible storm here also looks very suspicious, with a small hook and clear couplet.
October 20, 2025 at 6:17 PM
An additional tornado suspect from Belgium: www.vrt.be/vrtnws/nl/20.... The responsible storm here also looks very suspicious, with a small hook and clear couplet.
Apparently we also got a tornado in the Netherlands. No report of damage yet. www.facebook.com/RadioSpannen..., www.weerwoord.be/m/3247677
October 20, 2025 at 5:44 PM
Apparently we also got a tornado in the Netherlands. No report of damage yet. www.facebook.com/RadioSpannen..., www.weerwoord.be/m/3247677
I expect that an additional tornado occurred north of Troyes based on radar, given colocation of tight couplet with CC drop => likely TDS:
October 20, 2025 at 5:19 PM
I expect that an additional tornado occurred north of Troyes based on radar, given colocation of tight couplet with CC drop => likely TDS:
Two cranes collapsed in the tornado: x.com/MKH93LND/sta...
October 20, 2025 at 5:13 PM
Two cranes collapsed in the tornado: x.com/MKH93LND/sta...
A damaging tornado occurred with this storm: x.com/MeteoExpress..., x.com/Matb95x/stat...
October 20, 2025 at 4:58 PM
A damaging tornado occurred with this storm: x.com/MeteoExpress..., x.com/Matb95x/stat...
There now is indeed a low-topped supercell close to the not-functioning Trappes radar. And there are additional supercells in northern France and southern Belgium.
October 20, 2025 at 3:15 PM
There now is indeed a low-topped supercell close to the not-functioning Trappes radar. And there are additional supercells in northern France and southern Belgium.