Right now
The most recent data we hold from NOAA arrived 5 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 5 July 2026 at 00:00 UTC. It is kept here as a record.
It is the 74th strongest of the 319 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 23 June 2026. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 4 at 6:56PM EDT until July 4 at 8:00PM EDT by NWS Mount Holly NJ
Urban PEI: 368,064 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 28, 2026 · score 67 · 9.1 km
- July 17, 2026 · score 48 · 10.2 km
- August 3, 2026 · score 54 · 10.3 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.
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 | 0.77/1 |
| Coordinates | 38.8396, -76.2139 |
| Nearest City | Easton (14 km) |
| Urban exposure index (PEI) | 368.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T22:56:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.e85c90d038859debabb07de15db6e992 |
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: 2026-07-04T22:56:00.000Z.
First archived: 2026-07-04T23:05:36.954Z. 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 | 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; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD and 1 more areas |
| Headline | Special Marine Warning issued July 4 at 6:56PM EDT until July 4 at 8:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-04T20:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e85c90d038859debabb07de15db6e9922f44232f.001.1","noaa_urn:oid:2.49.0.1.840.0.331f3a4b944f799598eaadf2f6a479815eaeb569.002.1","noaa_urn:oid:2.49.0.1.840.0.e26c56522c29f2b37991b8009dd493ac4d64ddc2.001.1","noaa_urn:oid:2.49.0.1.840.0.6b9144f890a268885cddd75e1c309fc3a5a4fd49.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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