Special Marine Warning for Patapsco River Including Baltimore Harbor
The National Weather Service Baltimore MD/Washington DC has issued a Special Marine Warning for the Patapsco River including Baltimore Harbor as strong thunderstorms move across the region. Mariners should prepare for wind gusts of 34 knots or greater, capable of producing dangerous waves, rapidly changing conditions, and significantly reduced visibility.
These storms can intensify quickly over the water, leaving little time for boaters to react. Even experienced mariners can encounter hazardous conditions when thunderstorms produce sudden gale-force wind gusts.
What to Expect
The warning highlights the potential for:
- Wind gusts of 34 knots (approximately 39 mph) or greater
- Sudden rough and choppy waters
- Frequent lightning
- Torrential rainfall reducing visibility
- Strong thunderstorm outflow winds
- Dangerous conditions for small boats and recreational watercraft
Special Marine Warnings are issued when thunderstorms become strong enough to create immediate hazards over coastal waters, bays, rivers, and harbors.
Areas Impacted
The warning includes:
- Patapsco River
- Baltimore Harbor
- Nearby Chesapeake Bay waters
Boaters navigating commercial shipping channels, marinas, or open sections of Baltimore Harbor should closely monitor weather conditions and be prepared to seek safe harbor immediately.
Marine Safety Tips
If you are on the water:
- Head to the nearest safe harbor immediately.
- Secure loose equipment and ensure everyone aboard is wearing a properly fitted life jacket.
- Stay off open water until thunderstorms have completely passed.
- Avoid metal railings, fishing rods, and other conductive objects during lightning.
- Monitor NOAA Weather Radio or trusted marine weather sources for updated warnings.
Waiting until strong winds arrive can make returning to shore much more dangerous.
Thunderstorms Continue Across the Mid-Atlantic
Forecasters expect multiple rounds of showers and thunderstorms across portions of Maryland and the Chesapeake Bay region. Additional marine warnings may be issued if new storms develop over the waters throughout the afternoon and evening.
Anyone planning boating or fishing activities should continue checking the latest forecasts before departing.
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Radar Watch HQ provides timely updates on severe weather, marine warnings, tropical systems, flooding, and hazardous conditions affecting communities across the United States. Continue following us for the latest National Weather Service alerts and marine safety information.
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Top 5 Radar Watch HQ Essentials for Marine Warnings
Protect yourself and your crew before heading onto the water with these marine safety essentials.
- USCG-Approved Inflatable Life Jacket – Comfortable, lightweight flotation that should be worn at all times while underway.
- Handheld Floating Marine VHF Radio – Stay connected with the U.S. Coast Guard, nearby vessels, and receive NOAA Weather Radio alerts even if your boat loses power.
- Waterproof Dry Bag – Protect phones, wallets, keys, emergency supplies, and important documents from heavy rain and waves.
- Rechargeable Waterproof LED Spotlight & Flashlight – Essential for navigating through heavy rain, low visibility, or after sunset.
- Marine First Aid & Emergency Survival Kit – Include waterproof bandages, emergency blanket, whistle, flashlight, multi-tool, and other emergency supplies for unexpected situations.
