This alert expired on 2 August 2026 at 19:15 UTC. It is kept here as a record.
It is the 66th strongest of the 143 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 28 July 2026. 21 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 2 at 2:44PM EDT until August 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 33,379 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 12, 2026 · score 43 · 3.9 km
- June 14, 2026 · score 22 · 4.4 km
- June 15, 2026 · score 22 · 9.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 38.3132, -76.4889 |
| Nearest City | St. Charles (50 km) |
| Population Exposed | 33.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-02T18:44:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.777cdb1cffdde6cf09f66b8e6235e472 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Cobb Island MD to Smith Point VA; Chesapeake Bay from Smith Point to Windmill Point VA; Chesapeake Bay from Windmill Point to New Point Comfort VA; Chesapeake Bay from New Point Comfort to Little Creek VA; Rappahannock River from Urbanna to Windmill Point; York River; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD |
| Headline | Special Marine Warning issued August 2 at 2:44PM EDT until August 2 at 3:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-02T15:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.777cdb1cffdde6cf09f66b8e6235e472210f19f8.001.1","noaa_urn:oid:2.49.0.1.840.0.cb48a1195d36d6cfc2239376a017c24368d7296b.001.1","noaa_urn:oid:2.49.0.1.840.0.c504d5679a58a411e062cefd83400f1dfd1a0df5.001.1"] |
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 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.