This alert expired on 27 May 2026 at 18:15 UTC. It is kept here as a record.
No stronger detection stands among the 62 recorded within 20 km of this point since 17 March 2026 — 29 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 27 at 12:20PM EDT until May 27 at 2:15PM EDT by NWS Mount Holly NJ
An estimated 287,186 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 10, 2026 · score 43 · 12.8 km
- July 9, 2026 · score 43 · 12.8 km
- August 8, 2026 · score 37 · 12.9 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 81 % 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 | 81% |
| Coordinates | 39.2519, -74.9555 |
| Nearest City | Millville (18 km) |
| Population Exposed | 287.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T16:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.e7f9917d3e846e5ddf9f690eec444322 |
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; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ 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; Waters from Manasquan Inlet NJ to Little Egg Inlet NJ from 20 to 60 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; 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 |
| Headline | Special Marine Warning issued May 27 at 12:20PM EDT until May 27 at 2:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-05-27T14:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e7f9917d3e846e5ddf9f690eec444322254e7fb4.001.1","noaa_urn:oid:2.49.0.1.840.0.bfdb10c697bd170d8dc27b63b0f79c123de1ea70.001.1"] |
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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Millville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.