Weather Alert: Strong wind in Corsica, heavy rain in Aquitaine and flooding in Pas-de-Calais

From Friday November 3 at 9:00 a.m. to Friday November 3 at 6:00 p.m.

Situation

After the passage of storm Ciaran this Thursday, the weather remains very rough in the south this Friday.
An episode of sustained rain, sometimes stormy, concerns Aquitaine after last night’s strong gale. This rain will continue until this Friday afternoon with accumulations which could reach more than 100 mm in the Landes and the Pyrénées-Atlantiques. These rains occur on already wet soils, creating a risk of flooding.
In Pas-de-Calais, the heavy rains last night aggravated the flooding of the Liane and the Hem which for the first time reached a historic level of 5.14 m in Isques. Significant overflows are in progress and could be aggravated by further rain or showers expected in the evening.
Finally, Corsica is experiencing heavy stormy rain until this Friday midday and an episode of stormy winds. We expect up to 200 mm on the Corsican mountains and gusts of more than 150 km/h.

On Saturday, a new stormy episode is expected, due to the deepening of a new depression in the Channel, named Domingos. The press release will then be extended this midday to other departments for this strong gale inland and storm on the coasts.

Observation

This Thursday

At 9 o’clock, we recorded 148 mm in Vivario (Haute-Corse), 140 mm in Evisa (South Corsica), 134 mm in Sampolo (South Corsica) and 127 mm in Asco (Haute-Corse). The wind blew very strong last night with a gust of 156 km/h in Biscarosse, 149 km/h in Messanges (Landes), 146 km/h at Île Rousse (Haute-Corse) and 141 km/h in Cagnano (Haute-Corse), which is a monthly record.

Evolution

Here is the chronology and characteristics of these bad weather

Friday morning, while the improvement reaches Corsica, the sustained rains even tend to increase in the southwest, particularly south of the Garonne with hourly intensities around 15 to 20 mm. The wind remains strong with gusts of more than 100 km/h possible on the coast and more than 90 km/h inland between the Basque coast and the Gers. The storm continues in Corsica with gusts of more than 150 km/h on the terrain and the Corsican Cape.

Friday afternoon, the gusts weaken very clearly with still 100 km/h on the Aquitaine coast and 80 km/h inland. The rains, on the other hand, persist and weaken only in the late afternoon and then evening. Note that it snows in abundance in the Pyrenees from 1200 to 1400 meters. The wind is weakening over Corsica with the strongest gusts being limited to the terrain.

On the episode we expect:

– 70 to 120 mm on the Landes and the Atlantic Pyrenees with peaks of 150 mm at the foot of the Pyrenees
– 30 to 50 cm of fresh snow above approximately 1500 meters and more than 70 cm above 1800 meters
– 150 to 200 mm on the Corsican Mountains, locally more than 200 mm with risks of landslides and flooding
– Gusts between 100 and 110 km/h on the Aquitaine coast and 90 to 100 km/h inland
– Gusts of more than 150 km/h on the Corsican mountains and on the Corsican Cap.

List of departments concerned