This alert expired on 9 July 2026 at 23:15 UTC. It is kept here as a record.
It is the 69th strongest of the 187 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 9 at 6:18PM EDT until July 9 at 7:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 208,814 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 18, 2026 · score 43 · 5.9 km
- March 20, 2026 · score 43 · 7.8 km
- July 28, 2026 · score 43 · 12.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 38.4886, -76.4728 |
| Nearest City | St. Charles (41 km) |
| Population Exposed | 208.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T22:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.43706f8a6a371a823484d44fd9e042ed |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; 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 9 at 6:18PM EDT until July 9 at 7:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-09T19:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.43706f8a6a371a823484d44fd9e042ed4f5824a5.001.1","noaa_urn:oid:2.49.0.1.840.0.fe380e857968e96cb4817a957bf543b675e88c3b.001.1","noaa_urn:oid:2.49.0.1.840.0.32a5079a68d795367751b51c384c6666c64788c5.001.1"] |
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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.