Right now
The most recent data we hold from NOAA arrived 60 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 17 March 2026 at 02:00 UTC. It is kept here as a record.
It is the 6th strongest of the 209 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 16 at 8:37PM EDT until March 16 at 10:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 2,296,037 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 5, 2026 · score 52 · 4.8 km
- June 12, 2026 · score 52 · 5.5 km
- May 14, 2026 · score 52 · 5.7 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % 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) | 52 / 100 |
| Our confidence | 88% |
| Coordinates | 38.4695, -77.0343 |
| Nearest City | Saint Charles (17 km) |
| Population Exposed | 2.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T00:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2f1b26b6cb93d13550a8b5948e84341edcf4df7e.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA |
| Headline | Special Marine Warning issued March 16 at 8:37PM EDT until March 16 at 10:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-16T22:00:00-04:00 |
| 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 | Road closure due to a downed tree. (LWX) |
| Iem TypeSummary | D |
| Iem City | Hyattsville |
| Iem County | Prince Georges |
| Iem State | MD |
| Iem Wfo | LWX |
| Iem Remark | Tree fell on a vehicle at the 6400 block of Kilmer Street |
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 near Saint Charles?
Calamity.live data shows a weather event with CalamityScore 52/100, near Saint Charles (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.