This alert expired on 27 June 2026 at 17:45 UTC. It is kept here as a record.
It is the 30th strongest of the 180 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 18 June 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 27 at 12:39PM EDT until June 27 at 1:45PM EDT by NWS Mount Holly NJ
An estimated 478,152 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 10, 2026 · score 41 · 2.7 km
- March 12, 2026 · score 48 · 3.9 km
- March 11, 2026 · score 48 · 3.9 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 | 39.4364, -75.4521 |
| Nearest City | Bridgeton (19 km) |
| Population Exposed | 478.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T16:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7915d744917971f760515a24d0789f5ba1e12d1e.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware Bay waters north of East Point NJ to Slaughter Beach DE |
| Headline | Special Marine Warning issued June 27 at 12:39PM EDT until June 27 at 1:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-27T13:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
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, near Bridgeton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.