This alert expired on 16 March 2026 at 19:15 UTC. It is kept here as a record.
It is the 61st strongest of the 248 detections recorded within 20 km of this point since 16 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 16 at 2:17PM EDT until March 16 at 3:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 859,722 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 27, 2026 · score 48 · 1.6 km
- July 23, 2026 · score 48 · 1.7 km
- June 14, 2026 · score 48 · 4.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 83 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 83% |
| Coordinates | 38.3826, -77.1147 |
| Nearest City | Cherry Hill (25 km) |
| Population Exposed | 859.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T18:17:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.af9baf2812a0de2263221f5fbd86852eeedf73a7.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued March 16 at 2:17PM EDT until March 16 at 3:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-16T15:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 SW Reston |
| Spc County | Fairfax |
| Spc State | VA |
| Spc Comments | Tree reported down on Lawyers Road at Fox Mill Road. (LWX) |
| MergedSources | [{"id":"spc_wind_38.92_-77.37_104","source":"spc","severity":"medium","severityValue":45,"timestamp":1773679860000,"latitude":38.92,"longitude":-77.37}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 48/100, near Cherry Hill (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.