UPDATE 6:30 p.m.: The tornado warnings for Harford and Baltimore counties expired at 6 p.m. There are some reports of storm damage in Beckleysville, northwest Baltimore County, trees and wires down in Bentley Springs and Cockeysville, and 0.88-inch diameter hail in Owings Mills. But Meteorologist-in-charge Jim Lee, out at Sterling, said there was no immediate confirmation of a tornado touch-down.

Here's a damage report list from the NWS.

"Oftentimes we see rotation on radar, and straight-line wind damage on the ground," he said. A weather service team will visit damage sites in Baltimore County on Thursday to look for signs of a tornado strike.

Here's how it looked from BWI. We recorded 0.15 inch of rain here at Calvert & Centre streets, with gusts to 24 mph. The temperature dropped from 81 degrees at 4 p.m. to 69 degrees at 6 p.m.

EARLIER: The National Weather Service has issued a tornado warning for Harford and Baltimore counties.