More than 200,000 customers went without power across Virginia when Michael swept through the state as a tropical storm, after originally being a Category 4 hurricane when it first made landfall on the Florida Panhandle on Wednesday.
Storms packing almost 180 kilometre-per-hour winds hit Portugal early Sunday leaving hundreds of thousands of people without power before carrying heavy rain on into Spain, authorities said.
The storm was about 85 miles south-southwest of Porto, Portugal and about 125 miles north of Lisbon, Portugal, the NHC said in a 5 p.m.
Civil defense officials said that more than two dozen people were injured in Portugal.
At the same time, Storm Callum unleashed fierce winds and torrential rains across much of western Britain with severe floods and landslides in parts of Wales.
More than 60 people were forced to leave their homes by the storm and 300,000 people suffered power cuts on Saturday night.
Leslie is still expected to generate swells that will affect the Azores, Madeira and the Canary Island throughout the weekend, in addition to the Atlantic coasts of Spain, Portugal and Morocco, forecasters said.
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Experts warned of "life-threatening surf and rip current conditions".
Hurricanes formed on the American side of the Atlantic rarely bring their destructive force to Europe.
Branches of trees are seen on a street at Benfica neigborhood as hurricane Leslie goes past in Lisbon, Portugal October 14, 2018.
Over the past 176 years, only Hurricane Vince has made landfall on the Iberian peninsula, hitting southern Spain in 2005, according to weather records.
Leslie was downgraded from a hurricane before it reached Portugal late on Saturday.
Spain's civil protection agency said the storms could still be "very strong locally" and that heavy rain was forecast for the north and east.