From Saturday July 15 at 6:00 p.m. to Sunday July 16 at 0:00 a.m.
The complete live weather forecast by telephone at
3201*
Situation
A very dynamic depression is circulating from the British Isles to the North Sea. The associated disturbance causes a short but strong stormy episode from the south of the Massif Central to the North-East and over the Center-East of France between Saturday afternoon and Sunday morning, in contact with the very hot air which rises from the Sahara. and cooler ocean air.
Observation
This Saturday
At 6 p.m., the storm front strengthened, causing stormy rains from Auvergne to Franche-Comté to Alsace. 20 to 40 mm of water fell locally as thunderstorms passed, such as in Nandax (62), Baudemont (71), Lons-de-Launier (39) where a gust reached 110 km/h, a monthly wind record .
At 3 p.m., the storm front is weakened for the moment. Ahead of this front, the heat continues to increase with 36°C in Grenoble, 33°C in Lyon and Colmar, 32°C in Chambéry and Dole.
At 12 p.m, stormy instability is still present from Limouisn to Lorraine. At the front, from Auvergne-Rhône-Alpes to Franche-Comté in the Grand-Est, it is very hot with already more than 30°C between Strasbourg, Grenoble, Lyon or Saint-Etienne.
At 9 a.m., the depression responsible for Saturday’s deterioration in France is located in Scotland. It is very unusual for the season, by its deepening (989 hPa) and by its extent to most of the North Atlantic. It causes stormy showers from Burgundy to the Ardennes, temporarily sustained. In Luthenay (58), 18 mm of rain has just fallen in the space of 1 hour
Evolution
This evening, these storms are progressing eastward, stretching from the north of the Massif Central to the north of Alsace, passing through Auvergne and Burgundy.
In the night from Saturday to Sundaythese thunderstorms extend from the east of Auvergne and from the north of Rhône-Alpes to Franche-Comté in Alsace.
Sunday morningthe strongest thunderstorms broke out from the Jura to the north of Rhône-Alpes before evacuating towards Italy and Switzerland before 9 a.m.
During this brief, very stormy episode, we expect:
– a high risk of hail (5 cm in diameter) from the north of Auvergne-Rhône-Alpes to Burgundy-Franche-Comté, as far as Lorraine and Alsace.
– powerful downbursts of up to 80 km/h
– 20 to 40 mm of water in 1 hour, which can lead to risks of local flooding
List of departments concerned
01 – Ain
Thunderstorms – Significant Risk
03 – Combine
Thunderstorms – Significant Risk
15 -Cantal
Thunderstorms – Significant Risk
21 – Côte-d’Or
Thunderstorms – Significant Risk
25 – Doubs
Thunderstorms – Orange Alert
39 – Jura
Thunderstorms – Orange Alert
42 – Loire
Thunderstorms – Significant Risk
43 – Upper Loire
Thunderstorms – Significant Risk
52 – Haute-Marne
Thunderstorms – Significant Risk
54 – Meurthe-et-Moselle
Thunderstorms – Significant Risk
57 – Moselle
Thunderstorms – Significant Risk
58 – Nievre
Thunderstorms – Significant Risk
63 – Puy de Dome
Thunderstorms – Significant Risk
67 – Lower Rhine
Thunderstorms – Significant Risk
68 – Upper Rhine
Thunderstorms – Significant Risk
69 – Rhône
Thunderstorms – Significant Risk
70 – Haute-Saone
Thunderstorms – Orange Alert
71 – Saone-et-Loire
Thunderstorms – Orange Alert
88 – Vosges
Thunderstorms – Significant Risk
90 – Territory of Belfort
Thunderstorms – Significant Risk
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