This alert expired on 2 September 2026 at 01:30 UTC. It is kept here as a record.
It is the 173rd strongest of the 259 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 28 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 1 at 8:06PM EDT until September 1 at 9:30PM EDT by NWS Baltimore MD/Washington DC
An estimated 3,538,048 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 4.2 km
- March 12, 2026 · score 52 · 5.3 km
- July 3, 2026 · score 52 · 5.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 85 % 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) | 46 / 100 |
| Our confidence | 85% |
| Coordinates | 39.6873, -75.0395 |
| Nearest City | Williamstown (3 km) |
| Population Exposed | 3.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T00:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4338fc8adbc87c59dfd875ac0e0a97ca68f72cbd.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay north of Pooles Island MD; Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 NM; Waters from Manasquan Inlet NJ to Little Egg Inlet NJ from 20 to 60 NM |
| Headline | Special Marine Warning issued September 1 at 8:06PM EDT until September 1 at 9:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-09-01T21:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4338fc8adbc87c59dfd875ac0e0a97ca68f72cbd.001.1","noaa_urn:oid:2.49.0.1.840.0.0e4fe796e87ef12b9817aa6d115f9fe3d726b35d.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | CBS News |
| MergedSources | [{"id":"gnews_weather_496748_252","source":"google_news","severity":"medium","severityValue":40,"timestamp":1788294959000,"latitude":39.95,"longitude":-75.16}] |
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 Williamstown?
Calamity.live data shows a weather event with CalamityScore 46/100, near Williamstown (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.