Thomas said the damage to the home occurred at the height of Friday's storm between 7 p.m. and 8 p.m.

Donald Alcorn said early Saturday afternoon that he was concerned one of the trees that had been damaged, but was still standing, might pose a threat to the home.

The damaged trees were at the rear of the Alcorn home, about 50 feet away in a wooded glade with a stream. Elsewhere along Cox Road, very little, if any, impact from the storm was noticeable.

Alcorn said what he assumed was a county crew came out early Saturday, around 3 a.m., to clear tree debris from the road.

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NWS investigates

A tornado had not been confirmed Friday night, but the damage is in an area that was under a tornado warning at the time of the reports, said National Weather Service meteorologist Stephen Konarik in Sterling, Va.

National Weather Service officials had said earlier Friday that a tornado had been confirmed near Jarrettsville, but later revised alerts to warn of a possible tornado.

The NWS did send a team to the Jarrettsville area Saturday afternoon to evaluate if there was a tornado touchdown, the county's Thomas said. The county reported Sunday that the initial conclusion was reached that the damage was likely to have been caused by a tornado. A final determination that it was a confirmed tornado was announced Monday afternoon.

Other parts of the county experienced heavy rainfall and localized flooding Friday night, Thomas said; however, "no other serious incidents were reported."

In addition, he said, no injuries were reported to the EOC as a result of the storm.

With regard to notifications, Thomas said the Division of Emergency Operations issued a tornado warning at 6:53 p.m. Friday, followed by emergency telephone calls through a countywide alert system at 7:03 p.m. The warning remained in effect until 7:30 p.m., he said.

A tornado touched down in Fallston on the evening of June 1, damaging several commercial buildings and homes and knocking down trees and power lines in the corridor along routes 1 and 147.

Elsewhere in the Baltimore region, Friday's storm first prompted a tornado warning at about 6:30 p.m. covering Cockeysville and later Phoenix, Sparks and Monkton. Baltimore County emergency officials reported seeing a funnel cloud near Brooklandville at 6:30 p.m.

By about 10 p.m., all of the thunderstorm activity had moved east of the Chesapeake Bay, Konarik said. The Baltimore region now appears in the midst of a week-long dry stretch.

Baltimore Gas and Electric Co. reported at about 10:30 p.m. Friday that there were 47 power outages in Baltimore County, 200 in Harford County, 400 outages in Howard County and 234 in Baltimore City.

Baltimore Sun Media Group reporters Scott Dance, Steve Kilar, Bryna Zumer and Allan Vought contributed to this article.