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Reposted by Bram van 't Veen

Corentin Augris @corentinaugris.bsky.social · 8h

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 :

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Bram van 't Veen @bramvantveen.bsky.social · 14h

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.

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Federico Pavan @federicopavan.bsky.social · 1d

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...

Corentin Augris @corentinaugris.bsky.social · 1d

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...

Isabelle Lesot Yvart on Reels

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Bram van 't Veen @bramvantveen.bsky.social · 1d

No CC drop near Metz and rotation weakened just before passing over the northern part of the city, so it seems like they dodged a bullet.

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Bram van 't Veen @bramvantveen.bsky.social · 1d

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.

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Corentin Augris @corentinaugris.bsky.social · 1d

The second one in Chaumont-en-Vexin :
www.facebook.com/groups/18707...

CHAUMONT EN VEXIN & CO | Facebook

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Bram van 't Veen @bramvantveen.bsky.social · 1d

Thanks, I hadn't seen this one yet. It apparently was produced around the same time as the Ermont tornado, but by the weaker storm NW of it.

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Bram van 't Veen @bramvantveen.bsky.social · 1d

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.

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Bram van 't Veen @bramvantveen.bsky.social · 1d

Apparently we also got a tornado in the Netherlands. No report of damage yet. www.facebook.com/RadioSpannen..., www.weerwoord.be/m/3247677

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Bram van 't Veen @bramvantveen.bsky.social · 1d

@corentinaugris.bsky.social

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Bram van 't Veen @bramvantveen.bsky.social · 1d

This signature north of Abbeville also looks suspicious for a possible TDS:

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Bram van 't Veen @bramvantveen.bsky.social · 1d

I expect that an additional tornado occurred north of Troyes based on radar, given colocation of tight couplet with CC drop => likely TDS:

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Bram van 't Veen @bramvantveen.bsky.social · 1d

Two cranes collapsed in the tornado: x.com/MKH93LND/sta...

Bram van 't Veen @bramvantveen.bsky.social · 1d

A damaging tornado occurred with this storm: x.com/MeteoExpress..., x.com/Matb95x/stat...

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Bram van 't Veen @bramvantveen.bsky.social · 1d

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.

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Bram van 't Veen @bramvantveen.bsky.social · 1d

Interesting setup over NW and N France today, with clear tornado potential given strongly curved low-level hodographs and sufficient CAPE.
And sadly another setup where we are missing the Trappes radar, which is out of service for replacement since 10 months now...

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Alex Spahn 🌋🌪️☄️ @spahn711.bsky.social · 10d

This image shows a stack of six lightning bolts nearly striking the same spot six time in only one minute of elapsed time! Mother nature really had it out for whoever was down there... #photography

A sculpted, layered LP supercell at night. The structure is illuminated by six lightning strikes hitting the ground to the right of the storm. A clear, starry night sky is on the left of the storm. A car's headlights can be seen in the distance.

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Keraunos @keraunos.org · 10d

🌪️Morbihan, 2 sept : enquêtes terminées.➡️2 tornades identifiées, dont une EF2 à Guéhenno (rafales estimées 200-220 km/h). Publication ce jour des dossiers complets : urlr.me/p6EBam

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Bram van 't Veen @bramvantveen.bsky.social · 12d

In most of Europe there is little atmospheric action currently, but central Sweden got a nice line of low-topped storms this afternoon, with embedded rotation: streamable.com/svaazc

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Marcus Beyer @meteomabe.bsky.social · 13d

Very good, Bram! It was indeed 20.05.2006. That was the biggest summetime tornado outbreak since at least 2000 for Central Europa, with 16 confirmed tornadoes in the ESWD. Graphic shows wind and tornado reports of that day.

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Federico Pavan @federicopavan.bsky.social · 14d

OTD in 1884 the likely most violent tornado known in Sicily struck northern Catania. Through the research conducted by our friend Paolo Torrisi and working closely with @essl-ecss.bsky.social staff, the tornado, which killed 28 people and injured up to 600 more, has been rated IF4 but the rating...

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Bram van 't Veen @bramvantveen.bsky.social · 14d

Looks like 20 May 2006. I actually didn't know much about this event, except that there was a tornado outbreak somewhere in May 2006. And since the map shows the Emden radar, it had to be before Spring 2018, so I decided to check the KM archive for this option that came to my mind. Tors + svr wind

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Marcus Beyer @meteomabe.bsky.social · 16d

Now the #tornado stripes seperated into strength. The second graphic shows weak (IF0 - IF1.5) vs. strong (IF2+) tornadoes. There is a disproportionately high maximum of strong tornadoes in the first 10 years compared to weak tornadoes. The average was 9 compared to 3 in the 10 years that followed.

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Jeff Frame @vortexjeff.bsky.social · 15d

Collection of damage photos and survey information on the EF-5 Enderlin, ND, tornado from NWS Grand Forks: www.weather.gov/media/fgf/En...

www.weather.gov

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Cameron Nixon @cameronjnixon.bsky.social · 15d

Here it is. The last 10 years of hail events across the U.S. using my prototype hail tracking algorithm!

Hoping to build out a more robust climatology of hailstorms like we have for tornadoes.

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