This alert expired on 9 August 2026 at 22:50 UTC. It is kept here as a record.
It is the 3rd strongest of the 40 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 9 at 6:41PM EDT until August 9 at 6:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 213,417 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 22, 2026 · score 67 · 4.8 km
- June 12, 2026 · score 43 · 7.6 km
- August 3, 2026 · score 37 · 13.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 86 % 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 | 86% |
| Coordinates | 37.6828, -78.7478 |
| Nearest City | Waynesboro (45 km) |
| Population Exposed | 213.4K within 50 km |
| Impact Tier | significant |
| Date | 2026-08-09 — time not reported by the source |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ce6bb2cf2b50bf1c2427a921e139db60d53a715b.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Nelson, VA |
| Headline | Severe Thunderstorm Warning issued August 9 at 6:41PM EDT until August 9 at 6:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-09T18:50:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | mph |
| Iem City | 1 WSW Stuarts Draft |
| Iem County | Augusta |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | A wind gust of 53 knots (61 MPH) was measured by a personal weather station (KVASTUAR110). Several trees were blown down, including onto cars and bringing down a couple of poles. |
| MergedSources | [{"id":"iem_G_38.020_-79.040_1786308540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786308540000,"latitude":38.02,"longitude":-79.04}] |
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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.