NOAA NWS / Event history
Special Marine Warning issued October 16 at 5:45PM EDT until October 16 at 7:45PM EDT by NWS Baltimore MD/Washington DC
Special Marine Warning · Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD. Severe; likely; urgency: immediate.
- Bulletin issued
- 16 October 2026 at 21:45 UTC
- First saved by us
- 16 October 2026 at 21:47 UTC
- Last included in a daily record
- 16 October 2026
The linked daily edition preserves what we captured that UTC day; this event page is not a live warning.
- Source classification
- Severe · Source alert
A recent feed check does not mean a new observation. This page preserves source records; it does not establish current safety or warning status.
- Issuer / area
- NWS Baltimore MD/Washington DC · Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD
- Certainty / urgency
- Likely / Immediate
- Message expiry (not hazard end)
- 16 October 2026 at 23:45 UTC
- Forecast onset / end
- 16 October 2026 at 21:45 UTC / 16 October 2026 at 23:45 UTC
Archived official description
SMWLWX The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for... Tidal Potomac from Indian Head to Cobb Island MD... Tidal Potomac from Key Bridge to Indian Head MD... * Until 745 PM EDT. * At 544 PM EDT, strong thunderstorms were located along a line extending from 29 nm north of Tidal Basin to 26 nm northwest of Key Bridge to 33 nm northwest of Alexandria to 41 nm northwest of Leesylvania State Park, moving southeast at 25 knots. HAZARD...Wind gusts 34 knots or greater. SOURCE...Radar indicated. IMPACT...Boaters in small craft could be thrown overboard by suddenly higher winds and waves capsizing their vessel. * Locations impacted include... Fort Washington, Tidal Basin, Reagan National Airport, Gunston Hall, Mason Neck State Park, Woodrow Wilson Bridge, Indian Head, Key Bridge, Fort Hunt, National Harbor, and Alexandria.
Instructions in this archived message
Move to safe harbor until hazardous weather passes.
The saved record
What changed
0 updates · 1 first record
Each update compares two versions we saved. This may not include every update from the source. A missing report does not mean an event has ended.
First saved record · 16 October 2026 at 21:47 UTC
Saved by us
Starting point
First saved record
Our first saved version of Special Marine Warning issued October 16 at 5:45PM EDT until October 16 at 7:45PM EDT by NWS Baltimore MD/Washington DC. We have no earlier saved version to compare.
Bulletin issued: 16 October 2026 at 21:45 UTC
View saved version 1
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:b6c139cd0cbf1b10eff62a7e", "authorityId": "urn:oid:2.49.0.1.840.0.96b48f4190142bd12f00184dea951123f29a573b.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [], "category": "weather", "title": "Special Marine Warning issued October 16 at 5:45PM EDT until October 16 at 7:45PM EDT by NWS Baltimore MD/Washington DC", "eventType": "Special Marine Warning", "occurredAt": "2026-10-16T21:45:00.000Z", "issuedAt": "2026-10-16T21:45:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-16T21:45:00.000Z", "onsetAt": "2026-10-16T21:45:00.000Z", "expiresAt": "2026-10-16T23:45:00.000Z", "forecastEndAt": "2026-10-16T23:45:00.000Z", "severity": "Severe", "urgency": "Immediate", "certainty": "Likely", "messageType": "Alert", "status": "Source alert", "place": "Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD", "coordinates": null, "issuer": "NWS Baltimore MD/Washington DC", "summary": "Special Marine Warning · Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD. Severe; likely; urgency: immediate.", "description": "SMWLWX\n\nThe National Weather Service in Sterling Virginia has issued a\n\n* Special Marine Warning for...\nTidal Potomac from Indian Head to Cobb Island MD...\nTidal Potomac from Key Bridge to Indian Head MD...\n\n* Until 745 PM EDT.\n\n* At 544 PM EDT, strong thunderstorms were located along a line\nextending from 29 nm north of Tidal Basin to 26 nm northwest of\nKey Bridge to 33 nm northwest of Alexandria to 41 nm northwest of\nLeesylvania State Park, moving southeast at 25 knots.\n\nHAZARD...Wind gusts 34 knots or greater.\n\nSOURCE...Radar indicated.\n\nIMPACT...Boaters in small craft could be thrown overboard by\nsuddenly higher winds and waves capsizing their vessel.\n\n* Locations impacted include...\nFort Washington, Tidal Basin, Reagan National Airport, Gunston\nHall, Mason Neck State Park, Woodrow Wilson Bridge, Indian Head,\nKey Bridge, Fort Hunt, National Harbor, and Alexandria.", "instruction": "Move to safe harbor until hazardous weather passes.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.96b48f4190142bd12f00184dea951123f29a573b.001.1", "source": "nws", "sourceName": "NOAA NWS" }Visit the external source ↗The external page may have changed since this version was saved.