This alert expired on 2 September 2026 at 19:15 UTC. It is kept here as a record.
It is the 112th strongest of the 192 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 23 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 2 at 2:18PM EDT until September 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 197,194 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 23, 2026 · score 43 · 3.0 km
- August 7, 2026 · score 37 · 3.2 km
- July 28, 2026 · score 43 · 8.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 81% |
| Coordinates | 38.3865, -76.6297 |
| Nearest City | St. Charles (35 km) |
| Population Exposed | 197.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T18:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.62bf8bcb6c9f4754b25479096f760eb5ba6e53b5.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued September 2 at 2:18PM EDT until September 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-09-02T15:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.62bf8bcb6c9f4754b25479096f760eb5ba6e53b5.001.1","noaa_urn:oid:2.49.0.1.840.0.d088a963d1e9d812ba5bae6ce7c373b964cdc1d8.001.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.