This alert expired on 12 March 2026 at 04:30 UTC. It is kept here as a record.
It is the 5th strongest of the 327 detections recorded within 20 km of this point since 12 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 11 at 11:55PM EDT until March 12 at 12:30AM EDT by NWS Upton NY
An estimated 27,271,343 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 28, 2026 · score 52 · 3.0 km
- July 6, 2026 · score 52 · 3.7 km
- August 28, 2026 · score 46 · 4.2 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 40.5348, -74.1205 |
| Nearest City | Great Kills (3 km) |
| Population Exposed | 27.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-12T03:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_d2db64cfbbdb511b1615bf8d029113538d261fc4_001_1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | New York Harbor |
| Headline | Special Marine Warning issued March 11 at 11:55PM EDT until March 12 at 12:30AM EDT by NWS Upton NY |
| Expires | 2026-03-12T00:30:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | New Vernon |
| Spc County | Morris |
| Spc State | NJ |
| Spc Comments | Trees and wires down in Harding Township. Time estimated from radar. (PHI) |
| Iem TypeSummary | D |
| Iem City | 1 SE Chester |
| Iem County | Morris |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Trees and wires down in Chester Township. Time estimated from radar. |
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 52/100, near Great Kills (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.