This alert expired on 17 March 2026 at 02:00 UTC. It is kept here as a record.
It is the strongest of the 163 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 71 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued March 16 at 9:49PM EDT until March 16 at 10:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 812,889 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 22, 2026 · score 52 · 5.9 km
- March 17, 2026 · score 52 · 6.1 km
- July 18, 2026 · score 52 · 8.7 km
How we know
Confirmed by 13 independent sources, including NOAA.
Our own score for this event is 72 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 | critical |
| Calamity Score (ours) | 72 / 100 |
| Our confidence | 88% |
| Coordinates | 38.5850, -76.5567 |
| Nearest City | St. Charles (32 km) |
| Population Exposed | 812.9K within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-03-17T01:49:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.fc25bc8f56b3142a45673c45d0e435aebb014879.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Calvert, MD |
| Headline | Tornado Warning issued March 16 at 9:49PM 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 E Alexandria |
| Spc County | City of Alexandri |
| Spc State | VA |
| Spc Comments | Power pole down at the 500 block of Nelson Ave (LWX) |
| MergedSources | [{"id":"spc_wind_38.96_-77.26_132","source":"spc","severity":"medium","severityValue":45,"timestamp":1773712647754,"latitude":38.96,"longitude":-77.26},{"id":"spc_wind_38.54_-77.08_142","source":"spc","severity":"medium","severityValue":45,"timestamp":1773712647754,"latitude":38.54,"longitude":-77.08},{"id":"spc_wind_38.27_-77.18_145","source":"spc","severity":"medium","severityValue":45,"timestamp":1773712647754,"latitude":38.27,"longitude":-77.18},{"id":"spc_wind_38.89_-76.87_150","source":"spc","severity":"medium","severityValue":45,"timestamp":1773712647754,"latitude":38.89,"longitude":-76.87},{"id":"spc_wind_39.00_-77.22_222","source":"spc","severity":"medium","severityValue":45,"timestamp":1773708180000,"latitude":39,"longitude":-77.22},{"id":"spc_wind_39.06_-77.15_223","source":"spc","severity":"medium","severityValue":45,"timestamp":1773708360000,"latitude":39.06,"longitude":-77.15},{"id":"spc_wind_39.04_-77.18_224","source":"spc","severity":"medium","severityValue":45,"timestamp":1773708840000,"latitude":39.04,"longitude":-77.18},{"id":"spc_wind_38.51_-77.30_225","source":"spc","severity":"medium","severityValue":45,"timestamp":1773709200000,"latitude":38.51,"longitude":-77.3},{"id":"spc_wind_38.83_-77.13_226","source":"spc","severity":"medium","severityValue":45,"timestamp":1773709380000,"latitude":38.83,"longitude":-77.13},{"id":"spc_wind_38.85_-77.03_228","source":"spc","severity":"medium","severityValue":45,"timestamp":1773709920000,"latitude":38.85,"longitude":-77.03},{"id":"spc_wind_38.92_-77.09_229","source":"spc","severity":"medium","severityValue":45,"timestamp":1773709920000,"latitude":38.92,"longitude":-77.09},{"id":"spc_wind_38.82_-77.05_233","source":"spc","severity":"medium","severityValue":45,"timestamp":1773710940000,"latitude":38.82,"longitude":-77.05}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 72/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.