This alert expired on 22 June 2026 at 22:00 UTC. It is kept here as a record.
It is the 13th strongest of the 159 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 14 June 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 22 at 4:54PM EDT until June 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 5,485,498 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 22, 2026 · score 66 · 4.7 km
- August 6, 2026 · score 66 · 4.9 km
- August 6, 2026 · score 52 · 5.1 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 76 % 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 | 76% |
| Coordinates | 38.9852, -76.7647 |
| Nearest City | Bowie (6 km) |
| Population Exposed | 5.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-22T20:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.102b7720023431efe8af645583428f59 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay from Pooles Island to Sandy Point MD; Patapsco River including Baltimore Harbor; Tidal Potomac from Key Bridge to Indian Head MD |
| Headline | Special Marine Warning issued June 22 at 4:54PM EDT until June 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-22T18:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.102b7720023431efe8af645583428f594bb85138.001.1","noaa_urn:oid:2.49.0.1.840.0.be3eee08b2d395921c71294f3fbdc958adc55a6f.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.
Want to know when something happens near Bowie?
Calamity.live data shows a weather event with CalamityScore 52/100, near Bowie (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.