This alert expired on 10 May 2026 at 21:15 UTC. It is kept here as a record.
It is the 612th strongest of the 850 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 9 May 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 10 at 4:19PM EDT until May 10 at 5:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,497,350 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 12, 2026 · score 52 · 1.1 km
- May 19, 2026 · score 52 · 1.6 km
- April 1, 2026 · score 52 · 1.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 38.8400, -77.0433 |
| Nearest City | Glassmanor (4 km) |
| Population Exposed | 4.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-10T20:19:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Key Bridge to Indian Head MD |
| Headline | Special Marine Warning issued May 10 at 4:19PM EDT until May 10 at 5:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-05-10T17:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Glassmanor (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.