Weather alert: Heavy storms and strong winds – The Weather Channel

From Sunday October 23 at 12:00 to Monday October 24 at 9:00 Situation A virulent depression moves rapidly from the Bay of Biscay towards the south of England on Sunday and Monday. Fed with hot and very unstable air, this depression causes a gale in the north-west of France and strong thunderstorms in the east between Sunday afternoon and Monday morning. can be accompanied by hail and gusts of wind at 100 km/h from the Grand-Est to Burgundy in the Jura to the Massif Central and north of Rhône-Alpes. Locally, 50 mm of rain can fall in 1 to 2 hours, which can create risks of urban runoff and flooding. In the northwest, gusts can reach 70 to 90 km / h and locally 20% of more under the heaviest thunderstorms. By the sea, beware on Sunday evening, at high tide, of a moderate risk of coastal flooding on the coasts of Brittany. It should be noted that this type of stormy deterioration is common in summer, but rare in full heart of autumn. Occurring during the All Saints school period, this situation must deserve your greatest vigilance. If you have planned outdoor activities, the safest thing to do is to cancel them. Observation This Sunday At 6 p.m., a line of violent thunderstorms swept across Normandy this afternoon, causing very brief but heavy rains and powerful gusts. The wind reached 136 km / h in Boulleville (27). In Amiens (80), a powerful hailstorm was observed. In the east, from Lorraine to the Cévennes via Burgundy to the north of Rhône-Alpes, stormy showers occur. They are weaker than expected, which is why from Sunday at 10 p.m. this special press release will be lifted for the Grand Est and Burgundy. suddenly increased in the north-west of France to 95 km / h in Scille (79) and 92 km / h in Fontenay (85). A line of brief but violent thunderstorms is sweeping across Normandy and Pays de la Loire. In the east, before the arrival of the storms, it is hot with 25°C in Saint-Etienne (42) and Clermont-Ferrand (63) and a southerly wind which blows more and more strongly, at 95 km/ h in Lyon (69) and 80 km/h in Le Puy (43). At 12 noon, the depression continued to rise in the Bay of Biscay and was now located opposite, 200 km west of the island of Ouessant. The associated disturbance reached southern Brittany with heavy thunderstorms. In the east, the wind strengthens in Auvergne-Rhône-Alpes with gusts of 80 km/h in Le Puy (43) and 60 km/h in Saint-Etienne (42) and Mions (69). At 9 a.m., the depression responsible for the bad weather is located in the Bay of Biscay, between Corunna and Brittany. It causes a storm in the Pyrenees with gusts of 172 km/h at Iraty (64), 135 km/h at Lake Ardiden (65), 129 km/h at Maupas (31) and 125 km/h at Port of Aula (09). Evolution Here is the chronology and the characteristics of this degradation – Concerning the strong thunderstormsThis evening, the thunderstorms stretch from the Cévennes to Burgundy, reaching Haute-Savoie, Franche-Comté and the Grand-Est where they can be accompanied by hailstorms and very significant electrical activity and gusts at nearly 100 km/h. Due to the still leafy trees, the occurrence of these storms and violent winds can cause many leaves and branches to fall to the ground, requiring your vigilance, especially since it is the holiday period. continues from Ardèche to Haute-Savoie to Franche-Comté while the situation is improving rapidly elsewhere. for which this alert will be maintained until Monday 12 noon.- Concerning the galeThis evening, the wind episode reached its maximum intensity with gusts close to 100 km/h near the coasts of Brittany and the Cotentin. Due to rising tide coefficients (78 this Sunday evening) and the strong swell generated by the depression (waves up to 6 meters high), the risk of coastal submersion cannot be ruled out at high tide between 6 and 8 p.m. On the Haute-Loire, the Saint-Etienne basin, the Gier valley, the Pilat massif, the Forez plain as well as on the south of the Rhône department, the wind can reach 90 km/h in gusts. Due to the still leafy trees, the occurrence of these strong winds can cause many leaves and branches to fall to the ground, requiring your vigilance, especially since we are on vacation. This night, the depression continues to rise and crosses rapidly towards the south of England before reaching the North Sea on Monday at dawn. The strongest winds are then observed from Calvados to the Opal Coast to Artois north of Pas-de-Calais, with gusts close to 90 km / h, without aggravating character. It will be a classic gale for the fall. In the south-east, it will continue to rain on the Cévennes continuously with moderate intensities. Monday morning, as the depression moves away towards Denmark, the wind will weaken everywhere.