Two lines of strong thunderstorms swept through Kennebec County Thursday afternoon and evening, pouring heavy rain and knocking out power to more than 4,100 customers of Central Maine Power.

By 6:45 p.m., power was out to about 3,900 county residents, including 706 in Winslow and 1,213 in Mt. Vernon, according to CMP’s website. Power was restored to most Thursday night, with just about 100 Kennebec County residents without power by 7 a.m. Friday.

Crews from Central Maine Power and Fairpoint Communications were dispatched Thursday on multiple reports of downed wires in the region.

The National Weather Service in Gray issued a special weather alert for Kennebec County at 5:37 p.m., saying radar was tracking a strong thunderstorm near Winthrop and moving east. Forecasters expected pea-size hail in some areas and gusty winds.

Tom Hawley, meteorologist with the National Weather Service in Grey, said the first storm that moved through the region was the more severe of the two. In its wake, trees were reported down in Vassalboro and Waterville. In Belgrade, several trees were reported down on Oakland Road, Dunn Road and West Road, he said.

“That may be the end of it,” Hawley said.

Temperatures are expected to be cooler on Friday with a high in the 70s, but the dew point will be in the 60s. “It will still be fairly humid,” he said.

The region may get some showers moving in from the southwest, but clouds will clear out for the weekend, he said.