Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 27 May 2026 at 17:00 UTC. It is kept here as a record.
It is the 109th strongest of the 190 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 27 at 12:33PM EDT until May 27 at 1:00PM EDT by NWS Mount Holly NJ
An estimated 39,403 people live within 50 km of this point.
Nearby, since 11 March 2026
- September 3, 2026 · score 32 · 3.6 km
- August 27, 2026 · score 34 · 9.9 km
- August 8, 2026 · score 34 · 9.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 79% |
| Coordinates | 38.9125, -75.5203 |
| Nearest City | Dover (28 km) |
| Population Exposed | 39.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T16:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.30cbbfaf3e02db56357a826086843812 |
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 Great Egg Inlet to Cape May NJ out 20 NM; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; 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 |
| Headline | Special Marine Warning issued May 27 at 12:33PM EDT until May 27 at 1:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-05-27T13:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.30cbbfaf3e02db56357a826086843812fa09b730.001.1","noaa_urn:oid:2.49.0.1.840.0.f0a368d2d11789201423b9e0b246e11c23b1a141.001.1","noaa_urn:oid:2.49.0.1.840.0.e7f9917d3e846e5ddf9f690eec444322254e7fb4.001.1"] |
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 8 March 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.
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