Weather alert: Lasting rain and strong wind in Pas-de-Calais
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Situation
A very dynamic and disturbed south-westerly flow concerns the English Channel between Wednesday evening and Thursday evening. In this turbulent weather context, a gale is expected in Pas-de-Calais next night with stormy gusts on the coast, but also violent gusts inland. At the same time, a disturbance will undulate over the English Channel and will cause lasting and sometimes heavy rains in the Pas-de-Calais department between Wednesday evening and Thursday evening. The hills of Boulonnais will be the most exposed with accumulations of rain which could reach 40 to 60 mm in 24 hours, the equivalent of 10 to 15 days of rain. Appropriate floods could occur on streams descending from the hills towards the coast.
Observation
The episode of rain and strong wind has not yet resumed.
Evolution
This afternoon, the south-westerly wind gradually strengthens on the Channel coasts. At the end of the afternoon, the gusts of wind exceed 70 km/h inland and 90 km/h on the coast. Sometimes heavy showers flow from the Opal Coast to the hills of Boulonnais and Flanders.
Tonight and tonight the wind will reach its peak intensity with gusts of around 80 to 90 km/h inland and locally 100 km/h on the hills and sectors most exposed to the southwest wind. On the Opal Coast, the gusts will reach 100 km / h and locally 110-120 km / h in the vicinity of Cap Gris-Nez. The rains will be and sometimes sustained with in general 1 to 5 mm / hour and temporarily 5 to 8 mm / hour on the hills of Pas-de-Calais.
During the day Thursday, the wind likely to blow strong even if the intensities will be less than during the night with 80 km/h inland and 90 to 100 km/h, locally 110 km/h on the coasts. It can rain with intensities of 1 to 3 mm/hour, locally 5-6 mm/hour on the hills exposed to the southwest wind.
Over the whole episode, the accumulations of rain will be on average 25-30 mm, but will reach 40 to 60 mm on the hills of Boulonnais and Artois, i.e. the equivalent of 10 to 15 days of rain ..