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Forecast 6 to 9 metre waves raise wave-submersion risk on Breton coasts, with alerts spreading south-westward.
Waves of 6 to 9 metres are forecast on Breton coasts as the storm's low-pressure system moves across the region, raising the prospect of wave submersion along exposed shorelines. Three Breton departments are to be placed under orange vigilance from 22:00 Thursday, and the low-pressure system is forecast to pass over Ille-et-Vilaine and Manche overnight.
Further south, Pyrénées-Atlantiques has been placed under yellow wave-submersion vigilance from noon Friday, while coastal areas of Nouvelle-Aquitaine are under yellow vigilance from 06:00 Friday. Alongside these coastal alerts, gusts of 130 to 140 km/h are forecast on the Brittany and Normandy coasts.
Forecasts describe expected conditions, and the actual height and reach of waves at any given shoreline may differ. Météo-France has not ruled out extending orange vigilance to more departments.
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Exposed shorelines in Brittany face the greatest forecast wave exposure
Forecast waves of 6 to 9 metres, combined with gusts of 130 to 140 km/h, point to particular concern for exposed coastal areas in Brittany and Normandy. Orange vigilance in Brittany begins at 22:00 Thursday, ahead of the low-pressure system's passage over Ille-et-Vilaine and Manche overnight, leaving limited time for preparation.
From Thursday evening to Friday, alerts widen along the Atlantic coast
The sequence of warnings unfolds over roughly 14 hours. Orange vigilance for three Breton departments starts at 22:00 Thursday, followed by yellow wave-submersion vigilance in Pyrénées-Atlantiques from noon Friday and yellow vigilance in coastal Nouvelle-Aquitaine from 06:00 Friday. Météo-France has not ruled out extending orange vigilance, so the geographic scope could still change.