This alert expired on 18 July 2026 at 20:30 UTC. It is kept here as a record.
It is the 612th strongest of the 849 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 8 July 2026. 34 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 18 at 2:55PM EDT until July 18 at 4:30PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,638,140 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 12, 2026 · score 52 · 0.8 km
- May 19, 2026 · score 52 · 1.3 km
- April 1, 2026 · score 52 · 1.3 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 | 38.8567, -77.0417 |
| Nearest City | Southwest Waterfront (3 km) |
| Population Exposed | 4.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T18:55:00.000Z |
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 July 18 at 2:55PM EDT until July 18 at 4:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-18T16:30:00-04:00 |
| 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 52/100, near Southwest Waterfront (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.