Thunderstorms, Possible Tornado Strikes Region

May 23, 2011 Updated May 23, 2011 at 11:42 PM EDT

By John Borsa

May 23, 2011 Updated May 23, 2011 at 11:42 PM EDT

BUFFALO, NY (WKBW) - A line of severe thunderstorms swept through southern Chautauqua County Monday night, snapping trees and power lines and leaving about 1,000 utility customers without power.

The National Weather Service in Buffalo issued a tornado warning for Jamestown, Ripley, Clymer, Panama and other areas along the New York/Pennsylvania border.

The warning expired at 9:30 p.m.

At the Dutch Village Restaurant in Clymer, waitress Danielle Crane said customers and staff evacuated to the basement as the storm moved in.

"We warned them the procedures which would take place for a tornado sighting. Some of the customers here, most of the women went downstairs. Couple of us stayed upstairs and watched the weather outside," she said.

National Grid reported about 1,000 customers had their power knocked out in the Town of Busti, just south of Jamestown.

Trees and power lines are down over much of the area, but there are no reports of injuries, according to the Chautauqua County Sheriff's Department.

The National Weather Service is still investigating reports that a tornado touched down in the area.