This alert is in force until 31 August 2026, 01:00 UTC.
It is the 611th strongest of the 843 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued August 30 at 7:30PM EDT until August 30 at 9:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,079,941 people live within 50 km of this point.
Nearby, since 10 March 2026
- August 6, 2026 · score 52 · 2.0 km
- June 22, 2026 · score 52 · 5.1 km
- May 19, 2026 · score 52 · 6.1 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 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) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 38.7418, -77.0845 |
| Nearest City | Hybla Valley (1 km) |
| Population Exposed | 4.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T23:30:00.000Z |
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 August 30 at 7:30PM EDT until August 30 at 9:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-30T21:00:00-04:00 |
| 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 Hybla Valley (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.