In Aberdaron, south Wales, winds of more than 145 km / h were measured.
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Several hundred flights to or from the whole country have been grounded, British Airways and EasyJet announced.
The British Meteorological Institute (Met) placed South Wales on a red alert, the highest level, due to the heavy rains it brought Dennis.
– Disappearances and evacuations –
A red alert is equivalent to “dangerous weather conditions” that generate a “risk of death”, as well as danger of disturbance in the supply of energy and damage to infrastructure.
In South Wales, 132.8 mm of rain fell between Saturday morning and Sunday morning, the equivalent of a month of rainfall in this period in the region, according to MET.
Evacuations were ordered especially in the Welsh town of Skenfrith, said the police in the Gwent County to which it belongs.
– Rough sea –
Two bodies were found on Saturday off the coast of southern England, in a rough sea, when the storm began. It is unknown if these deaths are linked to the Dennis storm.
On Saturday, the Ministry of Defense deployed the army in West Yorkshire, an area in northern England severely affected last weekend by the floods left by the Ciara storm.
Several sports competitions scheduled for Sunday have been canceled.
The situation will remain difficult until Sunday afternoon in the southern regions of the United Kingdom, “where heavy and persistent rains will move eastward,” said the Met in his Twitter account, and also provides some “violent showers” with “very windy” episodes in the north and west of the country.
– Blackouts in France –
In the northwestern French region of Brittany, more than 30,000 homes were left without power for several hours and at nightfall there was still a need to restore service to some 18,000.
The French meteorological services raised at dusk the orange alert for that region, since the gusts of wind fell below the 100 hour kilometers.
“The rainy episode is coming to an end. The accumulated rainfall measured for the episode exceeds 40 mm ”in some sectors such as the departments of Finisterre and Morbihan, said Météo France.
Ferry traffic between France and Britain suffered delays during the day, explained the different companies that cover the route.
“We have some delays, between 30 and 45 minutes,” said a spokeswoman for DFDS Seaways.
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