This alert expired on 16 March 2026 at 19:00 UTC. It is kept here as a record.
It is the 612th strongest of the 838 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 16 at 2:16PM EDT until March 16 at 3:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,138,802 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 22, 2026 · score 52 · 5.4 km
- March 17, 2026 · score 52 · 8.0 km
- August 30, 2026 · score 52 · 8.6 km
How we know
Confirmed by 13 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 87 % 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) | 52 / 100 |
| Our confidence | 87% |
| Coordinates | 38.7658, -76.9900 |
| Nearest City | Oxon Hill (4 km) |
| Population Exposed | 4.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T18:16:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Charles, MD; Prince Georges, MD; St. Marys, MD; Fairfax, VA; King George, VA; Spotsylvania, VA; Stafford, VA; Anne Arundel, MD; Howard, MD; Montgomery, MD; Prince Georges, MD |
| Headline | Severe Thunderstorm Warning issued March 16 at 2:16PM EDT until March 16 at 3:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-16T15:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.efb3789d57da6944bd3abd7552fa8c3386064fe3.001.1","noaa_urn:oid:2.49.0.1.840.0.102ed26ede812eb440d73b09e436c7f1b78fd060.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 ENE Waterford |
| Iem County | Loudoun |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | Multiple large trees reported down on Browns Lane near Sunset Hill Lane. Spotter reports some trees snapped and laying in the same direction (W-SW). |
| Google News RssFeed | weather |
| Google News SourceName | Secret DC |
| MergedSources | [{"id":"iem_D_39.170_-77.330_1773675360000","source":"iem","severity":"low","severityValue":25,"timestamp":1773675360000,"latitude":39.17,"longitude":-77.33},{"id":"iem_D_39.340_-77.070_1773677040000","source":"iem","severity":"low","severityValue":25,"timestamp":1773677040000,"latitude":39.34,"longitude":-77.07},{"id":"iem_D_39.260_-77.230_1773676200000","source":"iem","severity":"low","severityValue":25,"timestamp":1773676200000,"latitude":39.26,"longitude":-77.23},{"id":"iem_D_39.140_-77.400_1773675120000","source":"iem","severity":"low","severityValue":25,"timestamp":1773675120000,"latitude":39.14,"longitude":-77.4},{"id":"iem_D_39.210_-77.420_1773674760000","source":"iem","severity":"low","severityValue":25,"timestamp":1773674760000,"latitude":39.21,"longitude":-77.42},{"id":"iem_D_39.230_-77.260_1773675720000","source":"iem","severity":"low","severityValue":25,"timestamp":1773675720000,"latitude":39.23,"longitude":-77.26},{"id":"iem_D_38.920_-77.370_1773679860000","source":"iem","severity":"low","severityValue":25,"timestamp":1773679860000,"latitude":38.92,"longitude":-77.37},{"id":"iem_D_39.250_-77.240_1773676080000","source":"iem","severity":"low","severityValue":25,"timestamp":1773676080000,"latitude":39.25,"longitude":-77.24},{"id":"iem_D_39.190_-77.590_1773674280000","source":"iem","severity":"low","severityValue":25,"timestamp":1773674280000,"latitude":39.19,"longitude":-77.59},{"id":"gnews_weather_492688_151","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773677520000,"latitude":38.9,"longitude":-77.04},{"id":"gnews_weather_492690_160","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773684399000,"latitude":38.9,"longitude":-77.04},{"id":"gnews_weather_492688_161","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773677605000,"latitude":38.9,"longitude":-77.04}] |
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 52/100, near Oxon Hill (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.