“It will shake strongly and we will have to be vigilant,” warns Sébastien Decaux, meteorologist at Météo Bretagne. Allusion to the strong northwest wind forecast during the night of this Saturday to Sunday, in Brittany, where Côtes-d'Armor and Ille-et-Vilaine have been placed on orange alert. The wind is also expected to be strong across the entire Finistère coast and the Morbihan islands. “The wind will really start to blow overnight from Saturday to Sunday and, from dawn, gusts could reach 100 km/h. It will last all day Sunday and it will only calm down in the evening, around 9 p.m.-10 p.m.,” confirms the meteorologist. Météo Bretagne predicts “very rough seas, with average lows of seven to eight meters in the Iroise Sea, four to six meters in the Channel and on the Morbihan islands”.
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2 Heavy showers and sleet
During the same night, heavy rain should also flood Brittany. “Clearances will occur between showers that are sometimes quite brutal, which may be accompanied by sleet,” warns Sébastien Decaux. On Sunday, it will be 7 to 10°C but it will feel much colder due to the wind. »
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3 “Well served in terms of gales”
Why such weather? “We have a very powerful anticyclone over the Atlantic, around 1,040 hPa (hectopascals) and, at the same time, we have a depression over the Scandinavian zone at 965 hPa. This very large pressure differential will create wind,” replies the specialist. “In addition,” he explains, “we have a high-altitude jet stream circulating in our area, which will boost the wind. » “It's true that, for the past month, we have been well served in terms of weather but there is nothing abnormal. It’s seasonal weather,” adds the meteorologist.
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4 Monday, “relatively mixed weather”
“Monday morning, there will still be a little wind with gusts of 60-70 km/h on all the Breton coasts,” emphasizes Sébastien Decaux. The showers will then fade and we will then have relatively mixed weather with clearings and clouds. »
Mists and fogs are forecast for Wednesday morning in Brittany. (Claude Prigent archive photo) -
5 Mists and fogs the day after New Year's Eve
“Tuesday, it will be gray with possibly a few drizzles,” continues the meteorologist. On Christmas Eve, from December 24 to 25, the weather will be very calm with some drizzle possible locally. What we should fear are the mists and fogs which could form on Wednesday from 5 a.m. Mist and fog formations in the region but no major bad weather. »
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6 Towards a “return of clearing” Thursday and Friday
According to Sébastien Decaux, “there are better things to look forward to on Thursday and Friday, because we are going to change the flow”. “By shifting towards the east,” he indicates, “the anticyclone will shift the wind more to the east and we will therefore have more continental and a little drier air. We should then see a return of clearings. »
