Right now
The most recent data we hold from NOAA arrived 18 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 4 September 2026 at 06:45 UTC. It is kept here as a record.
No stronger detection stands among the 9 recorded within 20 km of this point since 16 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 2:00AM EDT until September 4 at 2:45AM EDT by NWS Mount Holly NJ
Urban PEI: 32,899 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 23, 2026 · 16.9 km
- July 21, 2026 · 22.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.92/1 |
| Coordinates | 38.2198, -75.8253 |
| Nearest City | Salisbury (25 km) |
| Urban exposure index (PEI) | 32.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T06:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.120464ed2609e3aa91c0a7a6918f42466badcbbc.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-04T06:00:00.000Z.
First archived: 2026-09-04T06:02:12.332Z. 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 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; Waters from Cape May NJ to Fenwick Island DE from 20 to 60 NM; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Tangier Sound and the inland waters surrounding Bloodsworth Island; Chesapeake Bay from Smith Point to Windmill Point VA; Chesapeake Bay from Windmill Point to New Point Comfort VA; Rappahannock River from Urbanna to Windmill Point |
| Headline | Special Marine Warning issued September 4 at 2:00AM EDT until September 4 at 2:45AM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-04T02:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.120464ed2609e3aa91c0a7a6918f42466badcbbc.001.1","noaa_urn:oid:2.49.0.1.840.0.1662e0b3a7ffcd85ad5bb0f9e53f522eeefc8e9f.001.1","noaa_urn:oid:2.49.0.1.840.0.6b42357ce5e01deeed4478f74533daa1088c3138.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 58 |
| Spc Location | Delaware Coastal Airpor |
| Spc County | Sussex |
| Spc State | DE |
| Spc Comments | Georgetown (GED) measured a 50 kt wind gust. (PHI) |
| Iem TypeSummary | M |
| Iem Magnitude | 46 |
| Iem Unit | mph |
| Iem City | 11 E Chesapeake Beach |
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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