This alert expired on 2 September 2026 at 03:45 UTC. It is kept here as a record.
It is the 40th strongest of the 55 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 1 at 10:48PM EDT until September 1 at 11:45PM EDT by NWS Mount Holly NJ
Nearby, since 16 March 2026
- March 16, 2026 · score 22 · 1.4 km
- July 22, 2026 · score 34 · 10.0 km
- September 2, 2026 · score 32 · 14.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % 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) | 16 / 100 |
| Our confidence | 66% |
| Coordinates | 38.9338, -74.9067 |
| Nearest City | Millville (53 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T02:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.ff04ef007ecc8a1ee28429061f2022440753f94d.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM; Waters from Cape May NJ to Fenwick Island DE from 20 to 60 NM; Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM; Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 NM; Coastal waters from Great Egg Inlet to Cape May NJ out 20 NM; Coastal waters from Cape May NJ to Cape Henlopen DE out 20 NM; Coastal waters from Cape Henlopen to Fenwick Island DE out 20 NM; Waters from Little Egg Inlet NJ to Great Egg Inlet NJ from 20 to 60 NM; Waters from Great Egg Inlet NJ to Cape May NJ from 20 to 60 NM; Waters from Cape May NJ to Fenwick Island DE from 20 to 60 NM |
| Headline | Special Marine Warning issued September 1 at 10:48PM EDT until September 1 at 11:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-01T23:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ff04ef007ecc8a1ee28429061f2022440753f94d.001.1","noaa_urn:oid:2.49.0.1.840.0.f1868b7e3b051f446c1a89ed4e0d977ce11745aa.001.1","noaa_urn:oid:2.49.0.1.840.0.987ea11f09590b49d88cbde6132406f23d781d87.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 51 |
| Iem Unit | MPH |
| Iem City | 6 ESE Woodland Beach |
| Iem County | ANZ430 |
| Iem State | DE |
| Iem Wfo | PHI |
| Iem Remark | Station SJSN4 - Ship John Shoal gusted to 45.1 kt. |
| MergedSources | [{"id":"iem_M_38.790_-75.160_1788316140000","source":"iem","severity":"low","severityValue":25,"timestamp":1788316140000,"latitude":38.79,"longitude":-75.16},{"id":"iem_M_39.300_-75.380_1788311880000","source":"iem","severity":"low","severityValue":25,"timestamp":1788311880000,"latitude":39.3,"longitude":-75.38}] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.