This alert expired on 7 July 2026 at 03:30 UTC. It is kept here as a record.
It is the 91st strongest of the 165 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 6 at 11:06PM EDT until July 6 at 11:30PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 17 March 2026
- August 3, 2026 · score 43 · 10.9 km
- July 21, 2026 · score 37 · 11.7 km
- July 8, 2026 · score 22 · 13.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % 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) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 38.1772, -76.7200 |
| Nearest City | Saint Charles (51 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-07T03:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9bba98936da18d48d9db0e14238362d6adc0e355.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA |
| Headline | Special Marine Warning issued July 6 at 11:06PM EDT until July 6 at 11:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-06T23:30:00-04:00 |
| 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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.