Right now
The most recent data we hold from NOAA arrived 49 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 21 May 2026 at 01:00 UTC. It is kept here as a record.
It is the 4th strongest of the 211 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 19 April 2026.
What the source measured
NOAA reported: Special Marine Warning issued May 20 at 7:30PM EDT until May 20 at 9:00PM EDT by NWS Mount Holly NJ
Urban PEI: 185,460 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- May 21, 2026 · score 43 · 0.0 km
- July 17, 2026 · score 67 · 3.6 km
- June 7, 2026 · score 43 · 4.9 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.5750, -74.2908 |
| Nearest City | Ocean Acres (18 km) |
| Urban exposure index (PEI) | 185.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T23:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.afa5b2295d6861eac6a6ad2bcf40e15446ded6f9.001.1 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-05-20T23:30:00.000Z.
First archived: 2026-05-21T00:49:16.004Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; Waters from Manasquan Inlet NJ to Little Egg Inlet NJ from 20 to 60 NM |
| Headline | Special Marine Warning issued May 20 at 7:30PM EDT until May 20 at 9:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-05-20T21:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | Bordentown |
| Iem County | Burlington |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Several wires down across Bordentown and Chesterfield. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_39.980_-74.820_1779314700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779314700000,"latitude":39.98,"longitude":-74.82},{"id":"iem_D_39.880_-74.830_1779315000000","source":"iem","severity":"low","severityValue":25,"timestamp":1779315000000,"latitude":39.88,"longitude":-74.83},{"id":"iem_D_40.140_-74.710_1779314760000","source":"iem","severity":"low","severityValue":25,"timestamp":1779314760000,"latitude":40.14,"longitude":-74.71}] |
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.
Review the area, threshold and delivery channel in your account.
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