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Special Marine Warning for Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point 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
Likely

What is happening

For the following areas... Tidal Potomac from Cobb Island MD to Smith Point VA... Tidal Potomac from Indian Head to Cobb Island MD... At 447 PM EDT, a severe thunderstorm was located 12 nm southwest of Potomac Creek, moving east at 30 knots. HAZARD...Wind gusts in excess of 48 knots and large hail. SOURCE...Radar...

What the bulletin says to do

Move to safe harbor immediately as gusty winds and high waves are expected. Frequent lightning is occurring with this storm. 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 Cobb Island MD to Smith Point VA... Tidal Potomac from Indian Head to Cobb Island MD... At 447 PM EDT, a severe thunderstorm was located 12 nm southwest of Potomac Creek, moving east at 30 knots. HAZARD...Wind gusts in excess of 48 knots and large hail. SOURCE...Radar indicated. IMPACT...Boaters could easily be thrown overboard by suddenly higher wind and waves capsizing their vessel. Boats could suffer significant damage in high winds and hail. Locations impacted include... Breton Bay, Potomac Creek, Saint Clements Bay, Maryland Point, Nanjemoy Creek, Port Tobacco River, Cobb Island, Swan Point, Coltons Point, Mathias Point, U.S. 301 Nice Memorial Bridge, Wicomico River, Popes Creek, Westmoreland State Park, Fairview Beach, Colonial Beach, and Dahlgren.

Lifecycle record

Official revisions

2 captured
  1. Update

    Special Marine Warning issued July 22 at 4:47PM EDT until July 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC

    Official revision
  2. Alert

    Special Marine Warning issued July 22 at 4:30PM EDT until July 22 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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Actual
Message type
Update
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