This alert expired on 12 March 2026 at 10:15 UTC. It is kept here as a record.
It is the 9th strongest of the 157 detections recorded within 20 km of this point since 12 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 12 at 4:40AM EDT until March 12 at 6:15AM EDT by NWS Baltimore MD/Washington DC
An estimated 3,902,834 people live within 50 km of this point.
Nearby, since 12 March 2026
- May 19, 2026 · score 52 · 0.4 km
- July 5, 2026 · score 66 · 1.6 km
- August 3, 2026 · score 58 · 2.8 km
How we know
Confirmed by 22 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 88% |
| Coordinates | 38.7000, -77.1367 |
| Nearest City | Woodlawn (2 km) |
| Population Exposed | 3.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-12T08:40:00.000Z |
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 |
| Headline | Special Marine Warning issued March 12 at 4:40AM EDT until March 12 at 6:15AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-12T06:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 1 S Marriottsville |
| Spc County | Howard |
| Spc State | MD |
| Spc Comments | Trees down onto houses in the 1300 to 1500 block of Driver Road. (LWX) |
| MergedSources | [{"id":"spc_wind_39.25_-77.57_101","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.25,"longitude":-77.57},{"id":"spc_wind_39.22_-77.53_102","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.22,"longitude":-77.53},{"id":"spc_wind_39.22_-77.48_103","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.22,"longitude":-77.48},{"id":"spc_wind_39.27_-77.31_106","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.27,"longitude":-77.31},{"id":"spc_wind_39.24_-77.28_109","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.24,"longitude":-77.28},{"id":"spc_wind_39.27_-77.35_110","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.27,"longitude":-77.35},{"id":"spc_wind_39.26_-77.23_112","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.26,"longitude":-77.23},{"id":"spc_wind_39.28_-77.20_113","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.28,"longitude":-77.2},{"id":"spc_wind_39.26_-77.17_115","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.26,"longitude":-77.17},{"id":"spc_wind_39.28_-77.13_117","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.28,"longitude":-77.13},{"id":"spc_wind_39.31_-77.11_119","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.31,"longitude":-77.11},{"id":"spc_wind_39.17_-77.24_120","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.17,"longitude":-77.24},{"id":"spc_wind_39.33_-77.06_121","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.33,"longitude":-77.06},{"id":"spc_wind_39.33_-77.04_122","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.33,"longitude":-77.04},{"id":"spc_wind_39.32_-77.02_123","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.32,"longitude":-77.02},{"id":"spc_wind_39.32_-77.03_124","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.32,"longitude":-77.03},{"id":"spc_wind_39.31_-76.98_125","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.31,"longitude":-76.98},{"id":"spc_wind_39.32_-76.98_126","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.32,"longitude":-76.98},{"id":"spc_wind_39.34_-76.94_128","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.34,"longitude":-76.94},{"id":"spc_wind_39.35_-76.96_129","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.35,"longitude":-76.96},{"id":"spc_wind_39.33_-76.90_130","source":"spc","severity":"medium","severityValue":45,"timestamp":1773305383861,"latitude":39.33,"longitude":-76.9}] |
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 Woodlawn (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.