This alert expired on 23 July 2026 at 04:30 UTC. It is kept here as a record.
It is the 10th strongest of the 144 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 22 July 2026. 18 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 22 at 10:22PM EDT until July 23 at 12:30AM EDT by NWS Baltimore MD/Washington DC
An estimated 137,507 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 7, 2026 · score 37 · 5.5 km
- July 28, 2026 · score 43 · 11.7 km
- March 12, 2026 · score 43 · 12.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 80 % 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 38.3596, -76.6308 |
| Nearest City | St. Charles (38 km) |
| Population Exposed | 137.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-23T02:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.083ec910fc462421dae36ff2ef56cb8b |
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; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued July 22 at 10:22PM EDT until July 23 at 12:30AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-23T00:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.083ec910fc462421dae36ff2ef56cb8b0e6e3b8a.001.1","noaa_urn:oid:2.49.0.1.840.0.1e134ff29f2e692d18bc7848346cff77489ae11a.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 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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.