Reported by SPC 167 days ago.
It is the 606th strongest of the 814 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 96 more were recorded here in the fortnight before it.
What the source measured
SPC reported: Wind UNK kt near 1 NNE Potomac, Montgomery, MD. Tree down on a house (LWX)
An estimated 4,758,087 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 17, 2026 · score 52 · 3.4 km
- July 7, 2026 · score 52 · 9.1 km
- July 9, 2026 · score 52 · 9.6 km
How we know
One source: SPC. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 66 % 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 | 66% |
| Coordinates | 39.0400, -77.1800 |
| Nearest City | Potomac (3 km) |
| Population Exposed | 4.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T00:54:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | wind |
| Speed | UNK |
| Location | 1 NNE Potomac |
| County | Montgomery |
| State | MD |
| Comments | Tree down on a house (LWX) |
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 Potomac (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.