This alert expired on 26 June 2026 at 22:30 UTC. It is kept here as a record.
It is the 12th strongest of the 286 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 23 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 26 at 6:20PM EDT until June 26 at 6:30PM EDT by NWS Baltimore MD/Washington DC
An estimated 568,578 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 27, 2026 · score 52 · 9.8 km
- June 13, 2026 · score 48 · 11.5 km
- June 12, 2026 · score 48 · 13.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 82 % 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) | 48 / 100 |
| Our confidence | 82% |
| Coordinates | 38.4027, -76.8132 |
| Nearest City | Saint Charles (25 km) |
| Population Exposed | 568.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-26T22:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.88f9e469cae4f65b29a8c12762489900 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Indian Head to Cobb Island MD; Chesapeake Bay from North Beach to Drum Point MD; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA |
| Headline | Special Marine Warning issued June 26 at 6:20PM EDT until June 26 at 6:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-26T18:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.88f9e469cae4f65b29a8c127624899005d32c88c.001.1","noaa_urn:oid:2.49.0.1.840.0.98ee32a1aeb0f8620bf78d37123c949c51f5196e.001.1","noaa_urn:oid:2.49.0.1.840.0.d7381bdb9200187caef3a34fc5612a203508c9d0.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | The Washington Post |
| MergedSources | [{"id":"gnews_weather_495141_228","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782510040000,"latitude":38.9,"longitude":-77.04}] |
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 48/100, near Saint Charles (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.