Forecasters say some of today's thunderstorms may pack a big punch, with winds strong enough to damage trees and power lines.

At 6:15 p.m. on Thursday, the NWS Medford OR issued an updated severe thunderstorm warning in effect until 6:45 p.m. for Siskiyou County.

"At 11:04 a.m., a severe thunderstorm was located over Slocum Creek Campground, or 34 miles northeast of Rome, moving northeast at 20 mph," says the weather service. "Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees."