Weather alert: strong thunderstorms of the Pyrenees in Alps and in Brittany

Of Tuesday August 19 at 4:00 p.m. au Wednesday August 20 at 10:00 p.m. – Weather alert: strong thunderstorms pyrenees

Situation

After the heat wave. Furthermore, now finished, a stormy risk requiring an alert is set up from the Pyrenees to the center-east and especially on the Cévennes massif where locally water blades> 50mm are possible. In addition, This rainy improvement will be welcome in a context of dried up soils after 10 days of intense heat wave. In addition, These rain-storm packets will then evacuate to the Alps and the Jura where significant cumulation of rain can still occur. Meanwhile, In contrast, stationary thunderstorms broke out in Brittany and can cause occasional floods.

For thunderstorms:
Stormy front of the Pyrenees in the center-east. Consequently, These thunderstorms are not generalized weather alert: strong thunderstorms pyrenees but locally pour large quantities of rain (> 30mm/h) as well as a risk. However, of hail.
Other very active cells are then formed on the Cévennes. move towards the lower Rhône valley, the Alps and the Franche-Comté in the night.

Given the uncertainty that remains concerning the total cumulation expected under the thunderstorms. an evolution on orange alert is not excluded during our next updates.

You should be vigilant in your trips. especially if you are in the mountains with a risk of runoff, landslide or even lightning.

Observation

Thunderstorm parameter: This Tuesday. stationary thunderstorms in Brittany was observed with many lightning impacts and locally supported rains. These thunderstorms were calmed at the end of the afternoon but the unstable trend is maintained.
In the south. strong thunderstorms broke out this afternoon at the foot of the Cévennes (Hérault and Gard) as well weather alert: strong thunderstorms pyrenees as on the Alps, the PACA and the Rel been east of Corsica.
A new stormy wave was born on the Pyrenees.
In Brittany. on the coasts of Armor, very punctual cumulation reached 40 mm in the Arrée mountains, and 16 mm towards Lamballe (22).
In the south, we was highly dispersed from 5 to 20 mm, locally 30 mm in the mountains.

The situation of Hérault and Gard requires greater caution due to more stationary thunderstorms.

Consult the weather in your city

Evolution

For thunderstorms:
A marked pluvio-storm episode touches France. Brittany is affected by stationary thunderstorms. with cumulatives that have already reached up to 40 mm locally and a risk of cumulatives close to 50 mm by Wednesday noon.
Further south. a Strong storm axis Gard in the Lozère and Hérault is set up, with intensities that can reach 30 weather alert: strong thunderstorms pyrenees to 60 mm in a short time and up to 80 mm sur les reliefsaccompanied by hail and gusts. These thunderstorms also win the Alps, Franche-Comté and the PACA region, mainly in the hinterland, as well as Corsica.
Given the uncertainty that remains concerning the total cumulation expected under the thunderstorms on the Cévenol massif. an evolution on orange alert is not dismissed during our next updates.

It will be necessary to be vigilant in your trips. especially if you are in the mountains with a risk of runoff, landslide, even lightning.