Weather warning: intense deterioration on Wednesday

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From Tuesday 6 September at 10pm to Thursday 8 September at 3am

Predicament

France faces a huge melancholy on the around Atlantic, with a south-southwest circulation bringing warm, humid air, although colder and colder air circulates at high altitudes. Consequence: the air mass becomes extremely unstable and conducive to occasionally violent storms. A new stormy wave will manage itself in the east and south-east, involving Wednesday afternoon and the night from Wednesday to Thursday. Large stormy downpours will also circulate in between the Pays de la Loire and Normandy.

Observation

Mardi
At 22h, the violent storms that however strike Champagne-Ardenne as considerably as Upper France, are promptly going away toward Belgium. They created extremely solid electrical exercise, with gusts of wind up to 90 km / h in the Marne.
In the south, as well, thunderstorm activity has been violent in the previous three hrs, with major rains in Ardèche wherever up to 93 mm in 2 hours have been recorded in Saint-Laurent du Pape. This was also the situation with the Drôme, with notably 49 mm recorded in Saint-Sauveur-en-Diois between 20:00 and 21:00.

At 19h, the thunderstorms stopped from 1:30 am near Montpellier. They drifted offshore, as a end result the purple notify was lifted.
The torrential rains that fell this afternoon in the Montpellier location are equal to 1 thirty day period of rainfall in September. Nonetheless, they continue being significantly from file rainfall in 24 hours, dated 29 September 2014 with 300 mm.

At 17h, the stationary storm continued on the coastal strip of Hérault and Gard, with still quite abundant rains amongst Montpellier and Nîmes. The space is topic to major flooding, which results in major inconvenience to the highway network. It falls from 10 to 20 mm for each hour on this sector. From noon it dropped from 50 to 100 mm with 133 mm in Prades-le-Lez (34). The Lez suffered a flood peak, getting 1 meter in Montpellier, but now stopped.
In addition, critical thunderstorms spread around the Auvergne (particularly in the Cantal) with cumulative precipitations that quickly achieved 30-50 mm in some locations, in the Haute-Loire and in the Aveyron.

At 15h, a torrential stationary storm fell between the north of Montpellier and Nîmes (Hérault and Gard), creating a reasonable reaction from the Lez and overflows. Site visitors situations were being very intricate in this space with numerous flooded streets. There were being previously virtually 100 mm locally.
In other places, additional mobile storms have moved into Auvergne, Cantal and Puy-de-Dôme, heading to the Loire.

At 12 o’clock, an lively line of thunderstorms shaped amongst Montpellier and Nîmes with high rainfall intensity. Other significant stormy showers broke out in Corrèze and Cantal with a significantly virulent storm in Saint-Privat which gave practically 40 mm among 11.00 and 12.00, the equivalent of 15-20 days of rain.

Evolution

This night, the most up-to-date storms depart the place from the north-east and a lull of various several hours starts. At the stop of the night time, localized thunderstorms strike the Languedoc again.

Wednesday early morning, some localized thunderstorms arise in Languedoc and in the lower Rhone valley, as nicely as at the foot of the Massif-Central. Often they are accompanied by weighty rain. On the other hand, stormy showers flow into in between the Charente-Maritime, the west of the Pays de la Loire and the Rennes basin.

Wednesday afternoon, concerning the Gulf of Lion and the Auvergne-Rhône-Alps a significant stormy degradation is step by step getting spot. Thunderstorms, accompanied by hefty rains and domestically hail and violent gusts of wind, will head towards Burgundy-Franche-Comté at the close of the afternoon. In the north-west, critical thunderstorms, domestically accompanied by hail, circulated involving the Pays de la Loire and southern Normandy.

Wednesday evening, thunderstorms continue on to multiply on an axis that goes from the Gulf of Lion to the center-east and north-east. The most violent thunderstorms issue eastern Languedoc, the Rhone Valley and the Pre-Alps with hail and significant rain. In the north-east, thunderstorms are potent even in spots at threat of violent phenomena.

In the initial aspect of the evening from Wednesday to Thursday, a stormy axis is recognized from the northeast to the Alps and the PACA area. The rains are major, but they go quickly eastward and ultimately drain off the japanese and southeastern borders by midnight.

Below are the main features of this critical stormy degradation
– weighty rains beneath thunderstorms with hourly accumulations from 15 to 20 mm and locally from 30 to 50 mm in the south-east.
– rain accumulations that could arrive at 50 to 80 mm through the episode, regionally 120 mm in japanese Languedoc, in the lessen Rhone valley and in western Provence.
– hail underneath the most lively storm cells
– gusts of wind that can arrive at 80-100 km / h in the most violent storms.
– possibility of floods, floods and landslides.

Listing of departments anxious

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