This alert expired on 11 August 2026 at 02:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 122 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 10 at 6:29PM EDT until August 10 at 10:00PM EDT by NWS Wakefield VA
An estimated 145,329 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 11, 2026 · score 43 · 0.0 km
- July 29, 2026 · score 43 · 0.0 km
- July 28, 2026 · score 43 · 0.0 km
How we know
Confirmed by 20 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % 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 | 88% |
| Coordinates | 37.4000, -78.7000 |
| Nearest City | Lynchburg (39 km) |
| Population Exposed | 145.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T22:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4ca6f206c534a7b6cd396ea3711035a7502ddad6.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Brunswick, VA; Greensville, VA; Isle of Wight, VA; Lunenburg, VA; Mecklenburg, VA; Northampton, VA; Southampton, VA; Surry, VA; Sussex, VA; York, VA; City of Chesapeake, VA; City of Emporia, VA; City of Franklin, VA; City of Hampton, VA; City of Newport News, VA; City of Norfolk, VA; City of Poquoson, VA; City of Portsmouth, VA; City of Suffolk, VA; City of Virginia Beach, VA |
| Headline | Severe Thunderstorm Watch issued August 10 at 6:29PM EDT until August 10 at 10:00PM EDT by NWS Wakefield VA |
| Expires | 2026-08-10T22:00:00-04:00 |
| SenderName | NWS Wakefield VA |
| HasExactCoords | false |
| Iem TypeSummary | D |
| Iem City | 1 WNW Altavista |
| Iem County | Campbell |
| Iem State | VA |
| Iem Wfo | RNK |
| Iem Remark | Tree blocking on ramp from SB US Hwy 29 to Bedford Avenue in Altavista, VA. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_37.390_-79.220_1786394700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786394700000,"latitude":37.39,"longitude":-79.22},{"id":"iem_D_37.050_-78.940_1786397400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786397400000,"latitude":37.05,"longitude":-78.94},{"id":"iem_D_37.340_-79.230_1786395240000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395240000,"latitude":37.34,"longitude":-79.23},{"id":"iem_D_37.140_-78.570_1786398480000","source":"iem","severity":"low","severityValue":25,"timestamp":1786398480000,"latitude":37.14,"longitude":-78.57},{"id":"iem_D_37.920_-78.330_1786395300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395300000,"latitude":37.92,"longitude":-78.33},{"id":"iem_D_37.320_-79.240_1786395000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395000000,"latitude":37.32,"longitude":-79.24},{"id":"iem_D_37.410_-79.170_1786394700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786394700000,"latitude":37.41,"longitude":-79.17},{"id":"iem_D_37.670_-78.890_1786395180000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395180000,"latitude":37.67,"longitude":-78.89},{"id":"iem_D_37.230_-79.290_1786395300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395300000,"latitude":37.23,"longitude":-79.29},{"id":"iem_D_37.320_-79.530_1786394400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786394400000,"latitude":37.32,"longitude":-79.53},{"id":"iem_D_37.450_-79.260_1786394640000","source":"iem","severity":"low","severityValue":25,"timestamp":1786394640000,"latitude":37.45,"longitude":-79.26},{"id":"iem_D_37.200_-78.600_1786397100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786397100000,"latitude":37.2,"longitude":-78.6},{"id":"iem_D_37.330_-79.160_1786395300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395300000,"latitude":37.33,"longitude":-79.16},{"id":"iem_D_38.000_-79.010_1786393560000","source":"iem","severity":"low","severityValue":25,"timestamp":1786393560000,"latitude":38,"longitude":-79.01},{"id":"iem_D_38.010_-78.980_1786393560000","source":"iem","severity":"low","severityValue":25,"timestamp":1786393560000,"latitude":38.01,"longitude":-78.98},{"id":"iem_D_37.070_-79.360_1786395900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395900000,"latitude":37.07,"longitude":-79.36},{"id":"iem_G_37.880_-78.690_1786394340000","source":"iem","severity":"low","severityValue":25,"timestamp":1786394340000,"latitude":37.88,"longitude":-78.69},{"id":"iem_D_37.960_-78.960_1786393440000","source":"iem","severity":"low","severityValue":25,"timestamp":1786393440000,"latitude":37.96,"longitude":-78.96},{"id":"iem_D_37.130_-79.310_1786395900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786395900000,"latitude":37.13,"longitude":-79.31}] |
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.