This alert expired on 14 May 2026 at 02:00 UTC. It is kept here as a record.
It is the 7th strongest of the 196 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 20 April 2026.
What the source measured
NOAA reported: Special Marine Warning issued May 13 at 9:11PM EDT until May 13 at 10:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 2,732,421 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 12, 2026 · score 52 · 1.5 km
- July 4, 2026 · score 52 · 2.9 km
- March 17, 2026 · score 52 · 4.0 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 81 % 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 | 81% |
| Coordinates | 38.5037, -77.0826 |
| Nearest City | Saint Charles (16 km) |
| Population Exposed | 2.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-14T01:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bf15c34181c3a2f828e354b5b29322b219d7f427.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued May 13 at 9:11PM EDT until May 13 at 10:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-05-13T22:00:00-04:00 |
| 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 Saint Charles (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.