(UPDATED 8:30 p.m.) We're in a lull before the final round of storms come through.

BGE is reporting more than 6,300 customers without power.

The worst damage and a potential tornado were reported in Bel Air, according to comments from readers on Bel Air Patch.

(UPDATED 7:50 p.m.) The storm moving through Baltimore city into northern Baltimore County the National Weather Service has downgraded its alert to a severe thunderstorm warning for this most recent cell.

This warning is in effect until 8:15 p.m.

Another round of storms is expected to come through between 9-10 p.m.

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(UPDATED 7:25 p.m.) Another tornado warning is in effect for extreme southern Baltimore County and Baltimore City, as another storm was spotted at 7:18 p.m.

The warning continues until 7:45 p.m.

(UPDATED 6:50 p.m.) Another band of storms are expected to come through the area between 9-10 p.m. tonight, but as of now most of Baltimore County is in the clear.

WBAL TV is reporting a building collapse in Bel Air in Harford County.

BGE reports that 6,344 customers are without power in Baltimore County.

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(UPDATED 6 p.m.) A tornado warning has been issued for southern Baltimore County, northwestern Anne Arundel County and eastern Howard County.

The storm is near Fort Meade and moving up toward Catonsville and Arbutus.

The warning expires at 6:30 p.m.

(UPDATED 5:30 p.m.) The tornado watch has been lifted for Baltimore County, but there is another severe thunderstorm moving northeast of Laurel, according to WBAL TV.

A tornado warning is in effect for Howard, Anne Arundel and Prince George's County.

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(UPDATED 4:30 p.m.) The National Weather Service has extended the tornado warning for northwestern Baltimore County until 5 p.m. and for southwestern Baltimore County until 5 p.m.

A storm capable of producing a tornado was near Elkridge at 4:30 p.m. and moving east.

(UPDATED 3:30 p.m.) A tornado warning has been issued for the extreme northern parts of Baltimore County as a thunderstorm cell is moving north and east through Hampstead in Carroll County, according to WBAL TV.

The National Weather Service reported a tornado heading northeast from Hampstead and Westminster at 3:31 p.m.

The warning is in effect for the area around the Prettyboy Reservoir until 4:15 p.m.

The Baltimore Sun is reporting that flights have been halted outside of BWI Airport temporarily.

Maryland State Highway Administration officials provided drivers tips for being caught in severe weather:

Here are some things to remember about driving in severe weather:
•  Drivers should NOT drive through standing water.  “Turn around Don't Drown;”
•  High winds may cause downed trees and power lines (don’t go near sparking wires);
•  Use low-beam headlights when wipers are in operation;
•  Delay trips during severe weather; and
•  Remember to buckle up.

(Original story) Federal officials have issued a tornado watch for Maryland, lasting through 9 p.m. Friday night. 

Maryland is the center of a wide swath of storm activity across the east coast. The Storm Prediction Center calls for a slight chance of tornadoes across the Mid-Atlantic, with a moderate chance in parts of Western Maryland, Pennsylvania and Northern Virginia.

Shifting low pressure over the Ohio Valley will move a storm-producing cold front into the mid-Atlantic, according to the National Weather Service.

Forecasters at Accuweather.com call for the possibility of severe thunderstorms in the area through the evening, but breezy and sunny weather on Saturday.