Instead of the scheduled programming on Washington TV stations at 8 p.m. Monday, screens filled with red-colored maps, while serious voices alerted viewers to the possibility of tornadoes.

About 9:30 p.m. the National Weather Service issued the latest in a series of warnings that had tracked north and east from the West Virginia Panhandle through Loudoun County in Northern Virginia and into Maryland.

The warnings cited the passage of storms that could have produced tornadoes.

One of the latest was issued for central Carroll County in north-central Maryland. To remain in effect until 9 p.m., it told of a severe thunderstorm “capable of producing a tornado” seven miles north of Mount Airy and 10 miles southwest of Westminster. The storm was moving northeast at 20 mph, the Weather Service said.

By 9 p.m., a Weather Service warning said the storm was over Westminster, headed east.

In the warning, the Weather Service said that “radar indicated rotation.” Rotation is a hallmark of tornadoes.

The seriousness with which the warnings were taken did not seem unjustified in this area. Although the Washington region is not as commonly associated with tornadoes as other parts of the country, it has had its share.

It was not clear Monday night whether any tornadoes had actually touched down. Damage, however, had been reported along the path of the storminess, including Frederick County, Md..

Reports provided to the Weather Service from Jefferson County in the West Virginia Panhandle indicated that trees had toppled.

Another report said a shed had collapsed at a house in Ranson, W.Va. In addition, the report said, a box truck next to a house there had been flipped over. One injury was reported in connection with another collapse in Ranson.

The Weather Service warned of flooding in Frederick County.

At 9 p.m., Washington’s weather appeared rather bland, with a temperature of 71 degrees and a south wind of 12 mph under a cloudy sky.