Weather warnings: heavy showers and thunderstorms along the English Channel

Weather warnings: heavy showers and thunderstorms along the English Channel

Weather warnings: heavy showers and thunderstorms along the English Channel

Of Regis CREPET, meteorologist

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From Thursday 8 September at 8:00 to Thursday 8 September at 22:00

Situation

The storm disturbance, responsible for the bad weather in the east and in the Rhone valley, is now receding over Italy and Switzerland, with a very rapid improvement in the south-east of France which is catching up with the sun.
On the other hand, a depression is circulating very slowly over England. This is the cold drop that has been circling Ireland since this weekend and it is moving very slowly towards the North Sea. It is responsible for an unstable and cooler climate over a large northern half of France, with a succession of significant showers along the Channel coasts, mainly from Normandy to Upper France, which can generate a rather significant risk of flooding in places bass. At the same time, strong gusts of wind can occur as the strongest thunderstorms pass, with swirling phenomena, such as tornadoes along the coast.

Observation

At 10 o’clock, the showers were relatively light and few. However, a rainy front approached the Pas-de-Calais coast at the level of Boulonnais. However, the strongest intensity of these showers is expected in the afternoon.

This morning, the depression responsible for this disturbed weather, clearly visible on satellite images, is found in the Irish Sea at 1000 hPa and begins its slow progression towards England.
After the strong and frequent stormy downpours of the night between the Boulogne-sur-Mer and Calais regions, which generated accumulations of up to 49 mm in Boulogne, equivalent to 3 weeks of rainfall, new downpours are approaching the Atlantic coast. But during the morning a truce was established on the coasts of the Channel.

Evolution

This morning, the downpours arrive from the Pays de la Loire and take the direction of Normandy, sometimes punctuated by thunder. At the same time, the southwest wind blows considerably on the coasts, between 60 and 70 km / h.

At noon, strong stormy downpours along the coasts of the English Channel, between the Cotentin and the Opal Coast and in particular on the Boulonnais, particularly exposed in this configuration. Hourly intensities can reach 10mm under the heaviest showers.

During the afternoon, unstable weather spreads. Stormy showers follow one another. They are sometimes incurred, particularly on the Seine Maritime and the Somme. During the day, heaps of 15 to 30 mm are possible. Gusts of wind can accompany these storms and whirlwinds can form along the coast. Generally they do not cause harm, but they can surprise you. The waves get strong on the beaches, and it is advisable to be wary of it if you practice bathing activities.

At the end of the afternoon, the strongest downpours are concentrated on the Opal Coast, the North and the Pas-de-Calais.

List of departments concerned

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