the region will gain nearly 10°C in a few hours, forecasts

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Météo France placed Brittany on alert for rain-flooding on Saturday January 4. It will continue on Sunday. “And it will only be rain between now and Monday,” confirms Jérôme Dréanofrom Météo Bretagne. For news Renneshe shares the forecast weather of this end of weekendbut also from the beginning of next week, which rhymes with back to school after the Christmas holidays.

“A new disruption is coming. With her, the sweetness arrives via the Atlantic coast. We will go from 0, 1, even 2°C this Saturday in Brittany, to more than 10°C on Sunday,” notes Jérôme Dréano.

We are around 1°C in Rennes, a large part of Ille-et-Vilaine and Côtes-d'Armor. At the same time, it is already 13°C on the coast of Morbihan, Finistère and the Bigouden region. This warm front will spread to the rest of the region.

How to explain this change? “We was in a cold air mass until today. There disturbance with its warm front over the Atlantic heads towards the British Isles and generates an air mass conflict, won by mildness. »

We avoided the snow

If the temperatures were cold on the surfacethe air altitude was already hotwhich also explains why Brittany did not have snow.

As the hours pass, the mildness spreads across the entire vertical profile and will continue on Sunday morning with 10, 11, 12°C in the region. In the afternoon, it will be 14°C along the Channel coast.

Lots of rain expected

In terms of precipitation – the important element of the weekend – over the last 24 hours, between 2 and 13 mm of rain fell in Morbihan, between 5 and 15 in Finistère, “19 mm at the tip of the Raz”. “These are reasonable accumulations for the moment. »

On Sunday, the rains will persist intermittently. They will be especially persistent on the reliefs of Finistère: Monts d'Arrée, the Montagnes Noires. But also in the Landes de Lanvaux, in Morbihan, and towards Loire-Atlantique. ” THE rains will be less heavy on the other side of the region, to the northin the countries of Goëlo, Saint-Brieuc and dol-de-Bretagne. »

The wind is getting stronger

The wind, he shifts to the southwest. “This was not the case until then, we had a rather easterly wind until this Saturday evening. »

The wind and the warm front are therefore strengthening. There will be gusts up to 80 km/h, even 90 km/h on the coast Finistère and Morbihan, between the island of Groix and Belle-Île-en-Mer. Inland, gusts will reach 70-80 km/h and 50 to 60 in Ille-et-Vilaine.

Floods and waves-submersion

It will also be necessary to pay attention to the yellow vigilance in the Rennes region which concerns the following watercourses: Vilaine median, Meu, Ille-Illet and Seiche.

As in vigilance waves-submersion on the coast of Finistère and Morbihan : “The seas will be rough to very rough, with a coefficient of 75. There is therefore a small risk. Under these conditions, it's better not to venture to the coast. »

Still linked to this same depression, a new cold front will bring additional accumulations from Sunday evening. ” THE temperatures will go down a little, around 8 to 10°C Monday afternoon, more like 7°C on the heights of Côtes-d'Armor, i.e. season levels. »

More rain on Wednesday

For the start of next week, the weather will still be quite unsettled with further potentially heavy rain on Wednesday. “We will have to monitor the situation”supports Jérôme Dréano, from Météo Bretagne. Temperatures are expected to be slightly below normal, from 6 to 8°C, depending on whether we are inland or on the coast.

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