This alert expired on 28 August 2026 at 06:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 12 detections recorded within 20 km of this point since 2 April 2026. The last comparable one was on 10 August 2026.
What the source measured
NOAA reported: Flash Flood Warning issued August 27 at 11:17PM EDT until August 28 at 2:15AM EDT by NWS Blacksburg VA
Nearby, since 2 April 2026
- July 7, 2026 · score 43 · 16.2 km
- June 14, 2026 · score 22 · 19.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 61 % 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) | 22 / 100 |
| Our confidence | 61% |
| Coordinates | 37.7043, -79.7774 |
| Nearest City | Roanoke (50 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-28T03:17:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.fa7fd3e60c22f0430f3f840c42c011ba |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Giles, VA; Mercer, WV; Monroe, WV; Summers, WV; Alleghany, VA; Bath, VA; Albemarle, VA; Nelson, VA |
| Headline | Flash Flood Warning issued August 27 at 11:17PM EDT until August 28 at 2:15AM EDT by NWS Blacksburg VA |
| Expires | 2026-08-28T02:15:00-04:00 |
| SenderName | NWS Blacksburg VA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fa7fd3e60c22f0430f3f840c42c011ba45764e0b.001.1","noaa_urn:oid:2.49.0.1.840.0.a52b211218d13d208e51baed32fd4d06dd06fb6a.001.1","noaa_urn:oid:2.49.0.1.840.0.cf43dc80c7967f1109fe88cb699833c6151aaa45.001.1"] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.