The weather worsened significantly on Thursday as an active cold front passed across the country, with heavy rain and strong winds in the west. Heavy stormy rain passed through the PACA region and then Corsica. A secondary depression is expected to produce strong winds in Brittany this Thursday evening. It is associated with a strong jet stream at high altitude (300 km/h). Winds are particularly strong under stormy grains with the risk of cyclonic phenomena (90 to 100 km/h on the coast). At night on the Atlantic coast, strong winds will change to New Aquitaine, and then this Friday, Saturday will affect the Mediterranean coast until 12 noon. Tramontane and westerly winds will produce winds of 90 to 120 km/h in Roussillon, Corsica and Var. Be aware of the risk of drowning along the Aquitaine coast as waves break up to 6 to 7 meters.
A cold front is located north of Aquitaine from Basse-Normandy in the midday. It rains continuously. In parallel, other heavy stormy rains affect the Cevennes, the south of the Rhône valley and the coast of the Bouches-du-Rhône (13). Finally, the low pressure causing the cyclone this evening in Brittany is centered to the west of Ireland, with a pressure of 992 hPa in its centre.
Tonight: Westerly to southwesterly winds strengthen south of the low pressure center over the Irish Sea. Wind gusts of 70 to 80 km/h in Brittany and 90 to 100 km/h along the coast, with a 30% risk of gusts of 110 km/h. The sea state is rapidly deteriorating, especially at the tip of Finisterre with waves over 6 meters high. At the same time, from 10 p.m., associated with the passage of the cold front, the tramontane clearly strengthens in Roussillon with a speed of more than 90 km/h.
Next night: Low pressure moved into the English Channel, moving towards the Côte d’Opale, and the wind quickly shifted to the northwest, reaching the Vendée and Aquitaine coasts. Expected winds are 70 to 80 km/h inland, with a 30% chance of locally exceeding 90 km/h under strong thunderstorms. Along the coast, the wind speed is 90 to 100 kmph. Blowing at high speed and over 110 in some places. At the same time, northerly winds temporarily subside in the Mediterranean, and a cold front moves into Italy. Beware of the risk of drowning on the Aquitaine coast, where waves break up to 6 to 7 meters.
Friday morning: Low pressure is present over the North-Eastern part of the country. This is an improvement in Brittany, although northwesterly winds remain strong with gusts of 70 to 80 km/h along the banks of the Channel. Strong winds continue along the Aquitaine coast, with gusts of 90 to 100 km/h, locally under hurricane force winds. A new strength of Tramontana and westerly winds in the Mediterranean are expected, reaching 80-90 km/h by the end of the morning.
Friday afternoon: Wind gusts of up to 80 km/h have been warned along the Atlantic coast. On the other hand, in the Mediterranean, northerly and westerly winds reach speeds of 80 to 90 km/h and over 110–120 km/h along the coast and offshore.
Friday to Saturday night: Strong winds continue in Tramontana, while westerly winds calmly turn to the northeast between Corsica and the mainland. Wind gusts of 80 to 90 km/h in Roussillon and over 100 km/h along the coast.
Saturday morning: Tramontana gradually weakens and strong winds end in the afternoon.
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