Toulouse. It fell 100 mm within the house of an hour and a half: why the storm was so robust within the metropolis

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On August 10, 2019, a storm broke out within the metropolis of Toulouse. The working water has already turned some streets into torrents. The identical phenomenon occurred in Toulouse on Sunday, June 11, 2023. (© screenshot)

On Sunday, June 11, the storm was of uncommon depth Toulouse metropolis centre. Within the space of ​​u200bu200b1h30, from 75 to 100 mm of water fell on a sector Marengo And Jolimon.

As of August 10, 2019, below the affect of the depth of the rain and the slope, some streets in Toulouse have become a torrent.

Toulouse is on the coronary heart of the stormy exercise

And the storm hit the maps in other places within the south of Toulouse. However the sky was very uneven. Whereas Toulouse discovered itself below watery tombs, some close by cities recorded only some drops.

How will we clarify such an area density within the commune of Toulouse and particularly within the Marengo-Bonnefoy sector?

City warmth island in query?

the French meteorologist and climate presenter Guillaume Séchet He sees within the “City Warmth Island of Toulouse”, one cause for this depth:

“The estimated precipitation totals in Toulouse after right now’s storm are completely staggering as a result of we have now the impression that the city warmth island of Toulouse performed its full half in fueling this phenomenon: as much as 70 mm within the heart of the pink metropolis and nearly none within the rural areas to the north and south of town.”

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A number of convective storm cells

to Former forecaster of Météo France, Pascal Boroughit’s troublesome to say that the “city warmth island” would be the foremost explanation for this storm of “noticeable” depth:

“It’s clear that the core of the stormy exercise was recorded in Toulouse and specifically within the sector of Matabieu, Bonifoe and Jolimont. Areas the place there’s hotter air within the decrease layers of the ambiance. The hotter the air within the decrease layers, the convection cloud can type ” .


It’s the distinction of temperatures within the decrease layers (it was 30 levels in Toulouse on a Sunday afternoon with humid air, because the editor famous) with the temperature recorded within the higher layers (-16 levels at an altitude of 5,000 metres) that favored the formation of many persistences. being pregnant cells.

Pascal BoroughFormer forecaster at Météo France

Jolimont Hill was in a position to block out the new air

In keeping with Pascal Borough, the hill of Jolimont, which then extends southeast from the Rose Metropolis, may even have performed a job:

Jolimont Hill was in a position to maintain again the storm. Consolation at all times favors upward actions of air.

Concretely, the new and humid air recorded on the floor in these areas would have ran into the Jolimont terrain. Then it rose by way of the so-called orographic ascent. earlier than encountering chilly air at altitude.

This similar orographic phenomenon could have performed a job in creating malicious thunderstorms to the southwest and east from Toulouse on Sunday.

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