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Weather Alert: Heavy rain, snow, flood and strong wind

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From Friday, December 1 at 12:00 p.m. to Saturday, December 2 at 6:00 p.m.

Complete live weather forecasts by telephone at

3201*

Situation

The depression plunges this Friday off the coast of Charente-Maritime. It brings with it the very active rainy front from the southwest to the Alps. The rain/snow limit is between 1200 and 2000 meters from north to south of the Alps, causing washout below these altitudes. The associated heavy rains, combined with melting snow, cause river reactions and risks of overflowing, particularly of the Arve. At altitude, wet snow between 1200 and 2000 meters destabilizes the snowpack, hence the risk of avalanches becoming significant on Friday.
This evening and next night, the rain/snow limit drops to around 500-600 meters in the Massif Central and a few centimeters can accumulate at the first heights and in the Saint-Etienne metropolitan area.
This Saturday, the wind strengthens in the Mediterranean and the gusts become stormy between the Côte d’Azur and Corsica.

Observation

This Friday

At 12, we noted 129 mm in Ornon (Isère), 126 mm in Arvieux (Hautes-Alpes) and 112 mm in Vaujany (Isère).

At 9 o’clock, the accumulations over the last 36 hours reach 123 mm in Ornon (Isère), 115 mm in Arvieux (Haute-Alpes), 107 mm in Vaujany and 92 mm in Flaine (Haute-Savoie). It is snowing lightly on the Bas-Rhin with a sprinkling on the plains.

Evolution

This morning, It continues to snow lightly in the plains from Lorraine to Alsace where a small layer on the ground has formed. Light to moderate rain persists over the Alps and the snow gradually decreases towards 1200 meters over the Alps. We fear the reaction of watercourses in the Alpine valleys with possible overflows in places. The risk of avalanches will remain very high throughout the Alps.

This afternoonprecipitation persists over the Alps but gradually weakens at the end of the day with a lowering of the rain/snow limit around 1200 to 1500 meters.

Tonight and next nightthe snow drops from 500 to 700 meters between the Massif Central, the Jura and the Northern Alps.

Saturday morning,The wind is clearly strengthening between the Côte d’Azur and Corsica with gusts of over 100 km/h and peaks of over 130 in the mountains and on the capes. Some light snowfall persists on the central-eastern reliefs from 300 meters above sea level.

Saturday afternoon, the wind is still blowing in a storm between the Var, the Alpes-Maritimes and Corsica. On the other hand, snowfall is becoming increasingly rare on the hills.

On the episode we expect:
– 50 to 80 mm of rain in the Jura and Alpine departments by Friday morning, locally more than 150 mm (evening 2 to 3 weeks of rain in 36 hours)
– 5 to 10 cm beyond 500 to 600 meters on the Massif Central
– 15 to 20 cm of snow on average between 1700 and 2000 m on the Alpine terrain
– 20 to 50 cm beyond 1500 to 2000 meters from north to south of the Alps and more than 80 cm beyond 3000 meters.
– a marked avalanche risk across all Alpine departments on alert
– a westerly wind blowing at more than 100 km/h in Corsica and on the Côte d’Azur with peaks at 130-140 on the ends of the island of beauty and in the mountains

List of departments concerned

  • 01 -Ain

    Precipitation – Significant Risk

    Snow – Significant Risk

  • 04 – Alpes de Haute Provence

    Precipitation – Significant Risk

    Avalanche – Significant Risk

  • 05 – High mountains

    Precipitation – Orange Alert

    Snow – Significant Risk

    Avalanche – Significant Risk

  • 06 – Alpes-Maritimes

    Wind – Significant Risk

  • 2A – South Corsica

    Wind – Orange Alert

  • 2B – Upper Corsica

    Wind – Orange Alert

  • 25 – Doubs

    Snow – Significant Risk

  • 38 – Isère

    Precipitation – Orange Alert

    Snow – Orange Alert

    Avalanche – Significant Risk

  • 39 – Jura

    Precipitation – Significant Risk

    Snow – Significant Risk

  • 42 – Loire

    Snow – Significant Risk

  • 43 – Haute-Loire

    Snow – Significant Risk

  • 63 – Puy de Dome

    Snow – Significant Risk

  • 73 – Savoy

    Precipitation – Orange Alert

    Snow – Orange Alert

    Avalanche – Significant Risk

  • 74 – Haute-Savoie

    Precipitation – Orange Alert

    Snow – Orange Alert

    Floods – Orange Alert

    Avalanche – Significant Risk

  • 83 -Var

    Wind – Significant Risk

Gn headline FR

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