This alert expired on 17 March 2026 at 04:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 67 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 16 at 10:03PM EDT until March 17 at 12:00AM EDT by NWS Mount Holly NJ
An estimated 32,899 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 31, 2026 · score 28 · 4.7 km
- July 27, 2026 · score 34 · 11.5 km
- June 17, 2026 · score 22 · 19.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 82 % 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) | 34 / 100 |
| Our confidence | 82% |
| Coordinates | 38.0145, -75.8828 |
| Nearest City | Salisbury (46 km) |
| Population Exposed | 32.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T02:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.910705de11a5081a426f445d1445ca2b |
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 Fenwick Island DE to Chincoteague VA out 20 nm; Coastal waters from Chincoteague to Parramore Island VA out 20 nm; Coastal waters from Parramore Island to Cape Charles Light VA out 20 nm; Waters from Fenwick Island DE to Chintoteague VA from 20 to 40 nm; Waters from Chincoteague VA to Parramore Island VA from 20 to 40 nm; Waters from Parramore Island VA to Cape Charles Light VA from 20 to 40 nm; Chesapeake Bay from Smith Point to Windmill Point VA; Chesapeake Bay from Windmill Point to New Point Comfort VA; Chesapeake Bay from New Point Comfort to Little Creek VA; Chesapeake Bay from Little Creek VA to Cape Henry VA including the Chesapeake Bay Bridge Tunnel and 4 more areas |
| Headline | Special Marine Warning issued March 16 at 10:03PM EDT until March 17 at 12:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-03-17T00:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.910705de11a5081a426f445d1445ca2b3525abcc.001.1","noaa_urn:oid:2.49.0.1.840.0.f320ccb9c36f8ad8cda3cd1c34ff645487876356.001.1","noaa_urn:oid:2.49.0.1.840.0.24e087753f07e0c699002ea0bf03fcbf7e0bb545.001.1","noaa_urn:oid:2.49.0.1.840.0.2eb9b0ee992f49db40c6d81bcb1213d19382b8cc.001.1","noaa_urn:oid:2.49.0.1.840.0.e922c83a7f38068f3e715dc8fd9b04acc82915c5.001.1","noaa_urn:oid:2.49.0.1.840.0.6f06305c73cea93ba0b0c8ba019841752ea2aeef.001.1","noaa_urn:oid:2.49.0.1.840.0.0165425da867df3da90518602d964f1532d26364.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Leonardtown |
| Spc County | St. Marys |
| Spc State | MD |
| Spc Comments | St Mary's 911 reports about a dozen or so calls for trees and wires down from Leonardtown to Hollywood. (LWX) |
| MergedSources | [{"id":"spc_wind_38.30_-76.64_239","source":"spc","severity":"medium","severityValue":45,"timestamp":1773710880000,"latitude":38.3,"longitude":-76.64}] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.