Weather Alerts: Heavy rain, heavy snow, gales
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Situation
The FIEN depression circulates from the south of the Bay of Biscay to the Mediterranean basin. It produces frequent rainfall and strong winds on the coast of Aquitaine and Corsica, with significant accumulations south of Aquitaine, but also in the mountains of Corsica. This winter situation also favored the development of heavy snowfall from moderate altitudes in the Pyrenees, Massif Central and the Alps. On the outskirts, at the rear of the Fien depression that carries the cold behind it, snowfall was observed as far north and east as the country between Tuesday evening and Wednesday morning that lingered on the ground.
Observation
this tuesday
At 15 o’clock, the winds in Corsica are weakening. Storms last less than 3 hours even if gusts over 100km/h are still visible at the other end of the island. This occurs at Cagnano north of Bastia at 121 km/h, but also at the far south with 116 km/h at Cape Pertusato and 102 km/h at Porto-Vecchio. Moderate rains are still being observed in the south of Corsica. Snow has appeared on the mountain. Cumulative rainfall is now between 100 and 135 mm in relief over 48 hours.
South of Aquitaine, the winds continue to weaken. Maximum gusts are between 80 and 90 km/h, mainly on Biscarrosse and Cap Ferret. Light to moderate rain persists on P. Atlantiques.
In the central and northeastern parts of the country, snowfall is mostly on the ground for 2 to 3 hours. Indeed, because of the decrease in temperature associated with isothermal conditions, the snow cover on the ground reaches, for example, 1 to 2 cm at Orléans and 5 cm at Langres (52).
at 12, the wind was blowing in a thunderstorm on Corsica, up to 181 km/h on Sponde (2B) and 159 km/h on Île Rousse (2B). In the central part of the island, total rainfall reached 111 mm at Vivario (2B), which is equivalent to 1 month of rainfall.
In southern Aquitaine, after the passing of storm Fien which brought winds of 137 km/h over Ciboure (64) and 94 km/h over Pau (64) and Tarbes (65) this morning, the winds weakened, but were accompanied by heavy thunderstorms. endure. Thus, in the last 48 hours, 100 mm of rain has fallen on Biarritz (64) and 95 mm of rain on Laruns (64). In the mountains, fresh snow cover since yesterday reached 85 cm at La Pierre Saint Martin (64) and 80 cm at La Mongie (65).
In the center and east of the country, Auvergne, Rhône-Alpes, is serene with a few more snowflakes in the valleys north of the Alps. On the other hand, the situation worsened from the Val de Loire Center to Burgundy where it snowed onto the plains.
7 am, As Fien’s storm passed, winds picked up on the Basque coast, with speeds of 137 km/h in Ciboure (64) and 108 km/h in Biarritz (64). Rain is abundant in the south of Aquitaine: since Sunday morning, 101 mm of rain has fallen in Biarritz, that is, 1 month of precipitation. In the mountains, the western Pyrenees have experienced a blizzard with up to 70cm of fresh snow in Pierre Saint Martin (64) and 50cm in La Mongie (65) since Monday morning. In Massif Central, snow continued to fall from a height of 500 meters with a height of 30 cm on the ground recorded at 1,100 meters at Cantal. This snowfall reaches the alpine valleys as temperatures approach 0°C from Annecy to Grenoble.
Evolution
This afternoon : the rains are more intermittent in the southwest, as are the snowfalls in the Massif Central and the Alps. On the other hand, from Burgundy and the Jurassic to Normandy, snow is expected. Winds weakened on the coast of Aquitaine, but strengthened between Roussillon and Corsica.
Tonight : rainfall increases in the Landes and Pyrénées-Atlantiques, but decreases in Corsica. The snowfall between the Massif Central and the Alps retains its intermittent character. The snow fell all the way to the plains of Grand-Est.
Winter conditions, with snow at lower elevations, will continue as long Wednesday. However, if the risk of snow on the plains becomes more important, the amount should be kept moderate. But be careful, because a few inches can always surprise you on the snow stuck to the ground. The risk of flooding in the Landes and Pyrénées-Atlantiques will peak between Wednesday and Thursday.
