This alert expired on 17 March 2026 at 01:15 UTC. It is kept here as a record.
It is the 6th strongest of the 57 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: Severe Thunderstorm Warning issued March 16 at 9:05PM EDT until March 16 at 9:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 483,764 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 7, 2026 · score 37 · 4.7 km
- June 23, 2026 · score 43 · 7.5 km
- August 10, 2026 · score 43 · 8.3 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % 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) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 37.5558, -77.0245 |
| Nearest City | Highland Springs (27 km) |
| Population Exposed | 483.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T01:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8df7b78d8eb7173a114a2f3fefb86097 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Carroll, MD; Charles, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; Arlington, VA; Fairfax, VA; Prince William, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; Anne Arundel, MD; Calvert, MD; Charles, MD; Prince Georges, MD; St. Marys, MD; Caroline, VA; Charles City, VA; Essex, VA; Hanover, VA; Henrico, VA; James City, VA; King and Queen, VA; King William, VA; New Kent, VA; Prince George, VA; Richmond, VA; Surry, VA; Sussex, VA; Westmoreland, VA; York, VA; City of Williamsburg, VA and 3 more areas |
| Headline | Severe Thunderstorm Warning issued March 16 at 9:05PM EDT until March 16 at 9:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-16T21:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8df7b78d8eb7173a114a2f3fefb8609727cea7d2.002.1","noaa_urn:oid:2.49.0.1.840.0.503b301d015791513e96efa0e62605d194445796.001.1","noaa_urn:oid:2.49.0.1.840.0.9004be803624aab16711a3e9db72611e4238a403.002.1","noaa_urn:oid:2.49.0.1.840.0.4cb53a52530853df2f1cda1b6a8890c21802b036.002.1","noaa_urn:oid:2.49.0.1.840.0.b3d164a29681bb254af670d2f6739826a4f2b95e.002.1","noaa_urn:oid:2.49.0.1.840.0.08f2495f6c0c687568d138380a039da365de88df.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 WSW Short Pump |
| Spc County | Henrico |
| Spc State | VA |
| Spc Comments | Tree down. Time estimated from radar. (AKQ) |
| Iem TypeSummary | M |
| Iem Magnitude | 47 |
| Iem Unit | MPH |
| Iem City | 2 S Deltaville |
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 43/100, near Highland Springs (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.