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Ended official alertUpdated

Special Marine Warning for Tidal Potomac from Indian Head to Cobb Island MD

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
Likely

What is happening

For the following areas... Tidal Potomac from Indian Head to Cobb Island MD... At 548 PM EDT, severe thunderstorms were located along a line extending from Knapps Narrows Bridge to 8 nm northwest of Broomes Island to U.S. 301 Nice Memorial Bridge, moving east at 30 knots. HAZARD...Wind gusts in excess of 48 knots...

What the bulletin says to do

Move to safe harbor immediately as gusty winds and high waves are expected. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.

Read official NWS bulletin

Full official description

Bulletin details

For the following areas... Tidal Potomac from Indian Head to Cobb Island MD... At 548 PM EDT, severe thunderstorms were located along a line extending from Knapps Narrows Bridge to 8 nm northwest of Broomes Island to U.S. 301 Nice Memorial Bridge, moving east at 30 knots. HAZARD...Wind gusts in excess of 48 knots and small hail. SOURCE...Observed wind. IMPACT...Boaters could easily be thrown overboard by suddenly higher wind and waves capsizing their vessel. Boats could suffer significant damage in high winds. Locations impacted include... Cobb Island, Swan Point, Mathias Point, U.S. 301 Nice Memorial Bridge, Nanjemoy Creek, Port Tobacco River, Popes Creek, and Westmoreland State Park.

Lifecycle record

Official revisions

3 captured
  1. Update

    Special Marine Warning issued August 10 at 5:48PM EDT until August 10 at 6:00PM EDT by NWS Baltimore MD/Washington DC

    Official revision
  2. Update

    Special Marine Warning issued August 10 at 5:18PM EDT until August 10 at 6:00PM EDT by NWS Baltimore MD/Washington DC

    Official revision
  3. Alert

    Special Marine Warning issued August 10 at 4:04PM EDT until August 10 at 6:00PM 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.

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Message type
Update
Last collected
Methodology and corrections