This alert expired on 5 September 2026 at 01:00 UTC. It is kept here as a record.
It is the 64th strongest of the 152 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 2 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 4 at 2:05PM EDT until September 4 at 9:00PM EDT by NWS Blacksburg VA
An estimated 145,329 people live within 50 km of this point.
Nearby, since 16 March 2026
- September 4, 2026 · score 37 · 0.0 km
- September 2, 2026 · score 37 · 0.0 km
- August 11, 2026 · score 43 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 86% |
| Coordinates | 37.4000, -78.7000 |
| Nearest City | Lynchburg (39 km) |
| Population Exposed | 145.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T18:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0079c6ba57b895ba765e3ec53f58f515fc0123c7.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Alleghany, VA; Amherst, VA; Appomattox, VA; Bath, VA; Bedford, VA; Bland, VA; Botetourt, VA; Buckingham, VA; Campbell, VA; Carroll, VA; Charlotte, VA; Craig, VA; Floyd, VA; Franklin, VA; Giles, VA; Grayson, VA; Halifax, VA; Henry, VA; Montgomery, VA; Patrick, VA; Pittsylvania, VA; Pulaski, VA; Roanoke, VA; Rockbridge, VA; Smyth, VA; Tazewell, VA; Wythe, VA; City of Buena Vista, VA; City of Covington, VA; City of Danville, VA; City of Galax, VA; City of Lexington, VA; City of Lynchburg, VA; City of Martinsville, VA; City of Radford, VA; City of Roanoke, VA; City of Salem, VA; Greenbrier, WV; Mercer, WV; Monroe, WV; Summers, WV; Amelia, VA; Brunswick, VA; Caroline, VA; Charles City, VA; Chesterfield, VA; Cumberland, VA; Dinwiddie, VA; Essex, VA; Fluvanna, VA; Gloucester, VA; Goochland, VA; Greensville, VA; Hanover, VA; Henrico, VA; Isle of Wight, VA; James City, VA; King and Queen, VA; King William, VA; Lancaster, VA; Louisa, VA; Lunenburg, VA; Mathews, VA; Mecklenburg, VA; Middlesex, VA; New Kent, VA; Northumberland, VA; Nottoway, VA; Powhatan, VA; Prince Edward, VA; Prince George, VA; Richmond, VA; Southampton, VA; Surry, VA; Sussex, VA; Westmoreland, VA; York, VA; City of Chesapeake, VA; City of Colonial Heights, VA; City of Emporia, VA; City of Franklin, VA; City of Hampton, VA; City of Hopewell, VA; City of Newport News, VA; City of Norfolk, VA; City of Petersburg, VA; City of Poquoson, VA; City of Portsmouth, VA; City of Richmond, VA; City of Suffolk, VA; City of Virginia Beach, VA; City of Williamsburg, VA |
| Headline | Severe Thunderstorm Watch issued September 4 at 2:05PM EDT until September 4 at 9:00PM EDT by NWS Blacksburg VA |
| Expires | 2026-09-04T21:00:00-04:00 |
| SenderName | NWS Blacksburg VA |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0079c6ba57b895ba765e3ec53f58f515fc0123c7.001.1","noaa_urn:oid:2.49.0.1.840.0.6acc1489cc19c0753827489f5f013aa57ad97229.001.1"] |
| Heat Gov Event | Heat Advisory |
| Heat Gov Urgency | Expected |
| Heat Gov Certainty | Likely |
| Heat Gov Onset | 2026-09-04T12:10:00-04:00 |
| Heat Gov Expires | 2026-09-04T19:00:00-04:00 |
| Heat Gov AreaDesc | Rockingham; Caswell; Pittsylvania; Campbell; Appomattox; Buckingham; Halifax; Charlotte |
| Heat Gov SenderName | NWS Blacksburg VA |
| Heat Gov ZonesUsedForCentroid | 8 |
| Heat Gov ZoneCount | 8 |
| MergedSources | [{"id":"heat_gov_37.2_-78.1_heat_advisory_2026-09-04","source":"heat_gov","severity":"medium","severityValue":50,"timestamp":1788539760000,"latitude":37.16351903937313,"longitude":-78.13537492747838},{"id":"heat_gov_37.0_-79.1_heat_advisory_2026-09-04","source":"heat_gov","severity":"medium","severityValue":50,"timestamp":1788538200000,"latitude":36.97731223164034,"longitude":-79.06119304312234}] |
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 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 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.