Un temps gris et pluvieux dans l'Est dimanche, de la neige sur la vallée du Rhône

La Haute-Loire, la Loire, la Lozère et de l’Ardèche ont été placés en vigilance orange neige et verglas et une alerte orange aux avalanches a été émise pour les Hautes-Alpes et la Savoie à partir de dimanche 6 heures.

Le temps sera marqué dimanche par la perturbation bien active arrivée samedi qui progressera très lentement sur l’Est du pays et par un épisode neigeux notable en vallée du Rhône, selon les prévisions de Météo-France.

Après la Haute-Loire et la Loire, les départements de la Lozère et de l’Ardèche ont été placés en vigilance orange neige et verglas et une alerte orange aux avalanches a été émise pour les Hautes-Alpes et la Savoie à partir de dimanche 6 heures.

un temps gris et pluvieux dans l'est dimanche, de la neige sur la vallée du rhône

Route barrée en Ardèche après les fortes neiges, le 15 novembre 2019 (illustration)

Jusqu’à 5 cm de neige en pleine dans la vallée du Rhône

Le temps restera bien gris et pluvieux toute la journée sur une bonne moitié est. En Auvergne-Rhône-Alpes, les chutes de neige qui ont démarré en cours de nuit s’intensifieront en journée. En vallée du Rhône jusqu’à 5 cm de hauteur de neige seront possibles en plaine. Sur les reliefs des Alpes et de l’Auvergne entre 20 à 40 cm seront attendus. La limite pluie-neige pourrait descendre sur ces reliefs vers 200 à 300 mètres.

En région PACA et en Corse le temps restera bien agité toute la journée avec des averses localement orageuses à la côte. Les pluies seront soutenues sur les Alpes Maritimes et le Var. Le vent de Sud atteindra 80 à 90 km/heure à la côte et génèrera de grosses vagues sur les littoraux de PACA et du Sud de la Corse. Celles-ci atteindront près de 4 mètres de hauteur au large de la Corse du Sud en journée.

Tramontane et Mistral se lèveront en journée pour atteindre 80 à 90 km/h, voire 100 km/h en rafales.

Averses et éclaircies dans l’Ouest

Sur la moitié ouest du pays le ciel alternera entre averses et éclaircies. Les cumuls pourraient être encore localement importants dans le quart sud-ouest où les averses pourront prendre un caractère orageux en cours d’après-midi. Les chutes de neige perdureront sur le relief pyrénéen dès 600 à 800 mètres.

Les températures minimales seront comprises entre 2 et 6 degrés. Des gelées seront possibles en plaine sur les piémonts des Pyrénées, des Alpes et de l’Auvergne. Les maximales seront globalement comprises entre 8 et 12 degrés, mais resteront comprises entre 2 et 5 degrés à proximité des reliefs.

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