A strong storm moved through the western part of the state Sunday evening, prompting a tornado warning to be issued for northern Fairfield County.

The warning was issued after the storm producing heavy rainfall and strong winds showed a hook echo, Channel 3 Early Warning Weather Meteorologist Curtis Grevenitz said.

The warning was issued before 7 p.m. and was canceled at about 7:15 p.m. The storm then moved into Litchfield County, prompting a severe thunderstorm warning. That warning expired at 8:30 p.m.

The Sherman, New Milford and New Preston areas were worst hit by the storm.

The most severe storm damage was reported in the Litchfield Hills.

Nearly 300 customers lost power in New Milford when a tree fell on live wires, downing them on West Meetinghouse Road.

“I think it’s about the worst storm we’ve ever head, even though we didn’t lose any big trees,” said New Milford resident Betty Orzech. “Our yard is full of limbs and our windows got hit. The hail was banging on them and we ran down to the cellar when it started to whistle. I thought, ‘This must be a tornado.’ ”

Brief outages were also reported in Kent, Washington and Simsbury.

The entire state was under a severe thunderstorm watch until 11 p.m. and the parts of the state remained under a flash flood watch.