Thunderstorms rolled through the Washington area last night, knocking out power to about 28,200 households, knocking down trees and dumping almost two inches of rain at Dulles International Airport.

It was far wetter to the southwest. At Woodstock in the Shenandoah Valley, more than four inches of rain had fallen by 8 p.m., flooding streams and inundating low-lying roads.

Although several trees were knocked down and lightning struck several homes in this area, authorities reported no major property damage or injuries.

One of the first storms through the area brought 66-mile-an-hour winds to Sterling at 5:37 p.m., said Michael Lynch, of the National Weather Service. Strong winds were also reported at Dulles airport, and a tornado warning was issued for northern Fauquier County, although none was sighted. At National Airport, .47 inches of rain had been recorded by late last night, the Weather Service reported. The total at Dulles stood at 1.84 inches.

In Northern Virginia, 16,000 households served by Virginia Power lost electric service, a spokesman said. By mid-evening, all but 5,200 had had power restored, the spokesman said.

Nancy Moses, a spokeswoman for the Potomac Electric Power Co., said 12,200 customers served by Pepco lost power. Most -- 6,500 -- were in Montgomery County, 2,900 were in Prince George's County and 2,800 were in the District.

At National Airport, travelers had weather-caused delays of up to two hours, an airport official said.

Shortly before 6 p.m., lightning struck twice almost simultaneously in the 6100 block of 29th Street NW.

Paula Steinberg said lightning struck a tree and the edge of the roof of her home. "It was a very loud crack," she said. "Some of the boards were lifted off the outside of the house near the roof."

Across the street, a 200-foot-tall locust tree in Patrick Pascarella's back yard was struck by lightning about the same time.

The lightning stripped the tree of much of its bark, Pascarella said.

"I don't think the tree's going to make it," he said. "We're probably going to have to remove it."

Today's forecast calls for a 70 percent chance of rain with possible thunderstorms. The forecast is much the same for the weekend, with a 60 percent chance of rain predicted for tomorrow and Sunday.