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Ended official alertUpdated

Severe Thunderstorm Warning for Frederick, MD; Montgomery, MD; Loudoun, VA

This alert has ended.Kept for recent context. Do not use it as a current warning.

Official alert fields

What you need to know

Effective
Ended
Official severity
Severe
Official urgency
Immediate
Official certainty
Observed

What is happening

At 351 PM EDT, severe thunderstorms with a history of producing wind damage were located along a line extending from near Ballenger Creek to near Poolesville to near Leesburg, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Damaging winds will cause some trees and large...

What the bulletin says to do

For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with these storms. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning.

Read official NWS bulletin

Full official description

Bulletin details

At 351 PM EDT, severe thunderstorms with a history of producing wind damage were located along a line extending from near Ballenger Creek to near Poolesville to near Leesburg, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles. Locations impacted include... Germantown, Leesburg, Damascus, Broadlands, Lansdowne, Lowes Island, Brambleton, Poolesville, Ashburn, Sterling, Ballenger Creek, Great Falls, Countryside, Mount Airy, Purcellville, Oatlands, Boyds, Green Valley, Point Of Rocks, and Clarksburg.

Lifecycle record

Official revisions

2 captured
  1. Update

    Severe Thunderstorm Warning issued August 10 at 3:52PM EDT until August 10 at 4:15PM EDT by NWS Baltimore MD/Washington DC

    Official revision
  2. Alert

    Severe Thunderstorm Warning issued August 10 at 3:15PM EDT until August 10 at 4:15PM EDT by NWS Baltimore MD/Washington DC

    Official revision

Source and limitations

Publisher: Weather Alert Watch. Primary source: NWS Baltimore MD/Washington DC. This page reorganizes official fields and does not add a forecast or expand the affected area.

CAP status
Actual
Message type
Update
Last collected
Methodology and corrections