This alert expired on 5 August 2026 at 04:30 UTC. It is kept here as a record.
It is the 6th strongest of the 36 detections recorded within 20 km of this point since 26 May 2026. The last comparable one was on 22 July 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 4 at 9:07PM EDT until August 5 at 12:30AM EDT by NWS Blacksburg VA
An estimated 15,271 people live within 50 km of this point.
Nearby, since 26 May 2026
- July 22, 2026 · score 34 · 7.5 km
- May 28, 2026 · score 34 · 9.9 km
- June 10, 2026 · score 34 · 11.3 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 90% |
| Coordinates | 36.6031, -78.7656 |
| Nearest City | Henderson (45 km) |
| Population Exposed | 15.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-05T01:07:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.5f5213c854560d28eff64eafbb5d3e115718e76f.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Halifax, VA |
| Headline | Flash Flood Warning issued August 4 at 9:07PM EDT until August 5 at 12:30AM EDT by NWS Blacksburg VA |
| Expires | 2026-08-05T00:30:00-04:00 |
| SenderName | NWS Blacksburg VA |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 4.85 |
| Iem Unit | Inch |
| Iem City | 2 SSE Lunenburg |
| Iem County | Lunenburg |
| Iem State | VA |
| Iem Wfo | AKQ |
| Iem Remark | A personal weather station in Lunenburg County measured 4.85 inches of rain since midnight. |
| MergedSources | [{"id":"iem_R_37.010_-78.200_1785881580000","source":"iem","severity":"low","severityValue":25,"timestamp":1785881580000,"latitude":37.01,"longitude":-78.2},{"id":"iem_F_36.840_-78.150_1785880800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785880800000,"latitude":36.84,"longitude":-78.15},{"id":"iem_F_37.020_-78.210_1785882600000","source":"iem","severity":"low","severityValue":25,"timestamp":1785882600000,"latitude":37.02,"longitude":-78.21},{"id":"iem_R_37.010_-78.200_1785892620000","source":"iem","severity":"low","severityValue":25,"timestamp":1785892620000,"latitude":37.01,"longitude":-78.2},{"id":"iem_R_36.790_-78.500_1785876900000","source":"iem","severity":"low","severityValue":25,"timestamp":1785876900000,"latitude":36.79,"longitude":-78.5},{"id":"iem_F_36.930_-78.080_1785883200000","source":"iem","severity":"low","severityValue":25,"timestamp":1785883200000,"latitude":36.93,"longitude":-78.08},{"id":"iem_R_36.940_-78.260_1785886740000","source":"iem","severity":"low","severityValue":25,"timestamp":1785886740000,"latitude":36.94,"longitude":-78.26}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.