A yellow weather alert has been issued for seven departments in France as a weather system has moved eastward. Heavy rains and thunderstorms that initially affected the Mediterranean coast are now moving toward Italy, allowing the alert to be lifted in those areas. However, the storm system has stalled between the Jura Mountains and the Alps due to a cool, moist wind coming from the northwest. On Thursday morning, rainfall remains strong, with significant snowfall expected in mountainous regions. Across the entire weather event, 40 to 60 millimeters of rain or snow are expected in the most exposed areas, with a risk of sudden flooding in small streams and torrents. The air mass is cooling, and the boundary between rain and snow has dropped to between 1,600 and 1,800 meters in the Northern Alps, creating near-winter conditions at high altitudes.
During the night, thunderstorms moved away from the Mediterranean, while rainfall increased between the Jura and the Alps. In the early morning, heavy rains were frequent and strong from Franche-Comté to the Northern Alps. As cold air moved into the mountain ranges, the rain turned to snow above 2,000 to 2,400 meters, gradually descending to between 1,600 and 1,800 meters. Roads were very wet, and conditions were difficult on high-altitude passes, with reduced visibility and possible early snowfall. The main concerns were runoff on secondary roads and moderate flooding in mountain streams. From 6 am to 9 am, heavy rains continued in the Jura and especially in the Northern Alps, with snowfall gradually affecting areas above 1,600 to 1,800 meters. A sudden flood in some torrents was possible in the most heavily affected valleys.
From 9 am to 12 pm, rainfall began to decrease in the Jura but remained strong in the Alps, particularly near the borders. The rain-snow line stayed around 1,700 meters. In the afternoon, conditions improved from the west, with rainfall becoming more intermittent and mainly affecting the border mountain ranges. A few centimeters of snow were possible between 1,800 and 2,000 meters, and 10 to 20 centimeters above 2,500 meters. In the evening, the last rains gradually disappeared, with some snowflakes still possible between 1,500 and 1,700 meters in the most exposed areas of the Alps. People were advised to prepare for cold conditions with a jacket or sweater due to a cool air mass descending from the British Isles.
Snowfall in the plains in early October is rare in France, though historical records show it has occurred before. After a summer-like start to October, the shift to colder, wetter conditions is now well underway. Following a welcome improvement in rainfall on Wednesday and Thursday, calmer and drier weather is expected under the influence of a new weather pattern. Earlier in the week, a tornado struck early Wednesday morning in the towns of Grau-du-Roi and Port-Camargue in the Gard region, under violent thunderstorms. Trees were uprooted, and some roofs were damaged. Meanwhile, the southern part of California has been experiencing an unusual heatwave for early October, with temperatures in Los Angeles reaching unusually high levels.
Severe Weather and Tornado Strike in France Amid Unseasonal Cold Snap
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