Right now
The most recent data we hold from NOAA arrived 2 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 12 March 2026 at 01:15 UTC. It is kept here as a record.
It is the 7th strongest of the 120 detections recorded within 20 km of this point since 11 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 11 at 7:47PM EDT until March 11 at 9:15PM EDT by NWS Mount Holly NJ
An estimated 362,353 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 15, 2026 · score 43 · 6.9 km
- July 28, 2026 · score 67 · 10.6 km
- March 12, 2026 · score 43 · 11.1 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, at 78 % 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) | 43 / 100 |
| Our confidence | 78% |
| Coordinates | 39.4096, -75.7827 |
| Nearest City | Middletown (7 km) |
| Population Exposed | 362.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-11T23:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special-Marine-Warning_noaa_urn-oid-2_49_0_1_840_0_c5d284c56cee4650fb71c4af8e4b70f1 |
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; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD |
| Headline | Special Marine Warning issued March 11 at 7:47PM EDT until March 11 at 9:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-03-11T21:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c5d284c56cee4650fb71c4af8e4b70f1eebcbc21.001.1","noaa_urn:oid:2.49.0.1.840.0.8f985bd140d1c76c827b0638308bd25f1c17c0dc.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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