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UK Power Networks officials said up to 220,000 homes were without power.
Flood alerts have been issued in many parts of southern England and officials said hundreds of trees had been knocked down by wind gusts.
Gusts of 99 miles per hour (160 kph) were reported on the Isle of Wight in southern England. Gusts in the 75 to 80 miles per hour range were reported on the mainland.
The storm has hurricane-force gusts but is not classified as a hurricane. It was not formed over warm expanses of open ocean like the hurricanes that often develop in the Caribbean and threaten the east coast of the United States.