A powerful thunderstorm is rolling southeast through southern Maine, and has already knocked out power to more than 21,300 residents.

Most of the outages reported by Central Maine Power — 12,043 customers— were in Cumberland County, with nearly 1,600 others reported in Androscoggin County.

About 4,000 Lincoln County residents were in the dark, along with nearly 2,500 customers in Sagadahoc County.

The storm front is expected to move through York County until it pushes off the coast near Eliot by about 2 p.m., said Tom Hawley, a meteorologist with the National Weather Service in Gray.

The National Weather Service issued a severe storm warning for Georgetown and Bath, warning that gusting winds could top 60 miles per hour.

The storm will bring cooler, drier air after it passes, Hawley said, with humidity and temperatures falling considerably this afternoon during the evening commute.

Tomorrow will feel more like fall, Hawley said, with temperatures in Portland peaking in the mid 70s, with considerably less humidity.

This story will be updated.

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