This alert expired on 28 August 2026 at 19:00 UTC. It is kept here as a record.
It is the 37th strongest of the 81 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 August 28 at 2:02PM EDT until August 28 at 3:00PM EDT by NWS Mount Holly NJ
An estimated 207,185 people live within 50 km of this point.
Nearby, since 16 March 2026
- March 16, 2026 · score 43 · 7.5 km
- March 17, 2026 · score 43 · 7.7 km
- July 21, 2026 · score 67 · 7.9 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 91 % 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) | 37 / 100 |
| Our confidence | 91% |
| Coordinates | 39.1390, -74.7543 |
| Nearest City | Pleasantville (34 km) |
| Population Exposed | 207.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-28T18:02:00.000Z |
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; 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 |
| Headline | Special Marine Warning issued August 28 at 2:02PM EDT until August 28 at 3:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-28T15:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.93b64341344af08162520978a498de89f972a3ba.001.1","noaa_urn:oid:2.49.0.1.840.0.d2294ceb035d2ba6d60d53b6a64995b01414f687.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 1.19 |
| Iem Unit | Inch |
| Iem City | 2 ESE Nassau |
| Iem County | Sussex |
| Iem State | DE |
| Iem Wfo | PHI |
| Iem Remark | Mesonet station FW0960 Rehoboth Beach. |
| MergedSources | [{"id":"iem_F_38.690_-75.070_1787936400000","source":"iem","severity":"low","severityValue":25,"timestamp":1787936400000,"latitude":38.69,"longitude":-75.07},{"id":"iem_R_39.190_-74.820_1787937900000","source":"iem","severity":"low","severityValue":25,"timestamp":1787937900000,"latitude":39.19,"longitude":-74.82},{"id":"iem_R_38.930_-74.960_1787938200000","source":"iem","severity":"low","severityValue":25,"timestamp":1787938200000,"latitude":38.93,"longitude":-74.96},{"id":"iem_R_39.140_-74.770_1787936100000","source":"iem","severity":"low","severityValue":25,"timestamp":1787936100000,"latitude":39.14,"longitude":-74.77},{"id":"iem_R_38.700_-75.130_1787938200000","source":"iem","severity":"low","severityValue":25,"timestamp":1787938200000,"latitude":38.7,"longitude":-75.13},{"id":"iem_R_38.710_-75.120_1787937900000","source":"iem","severity":"low","severityValue":25,"timestamp":1787937900000,"latitude":38.71,"longitude":-75.12}] |
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 37/100, near Pleasantville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.