This alert expired on 10 August 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 102 recorded within 20 km of this point since 17 March 2026 — 32 others scored the same. Another comparable one was recorded here earlier the same day. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 10 at 6:15PM EDT until August 10 at 7:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 511,761 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 4, 2026 · score 48 · 13.4 km
- July 27, 2026 · score 48 · 13.4 km
- July 27, 2026 · score 48 · 15.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 85 % 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) | 48 / 100 |
| Our confidence | 85% |
| Coordinates | 37.3554, -77.5622 |
| Nearest City | Chester (11 km) |
| Population Exposed | 511.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T22:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f51227b98e4e259ef125f320c0b6b34a |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Calvert, MD; St. Marys, MD; Charles City, VA; Chesterfield, VA; Goochland, VA; Hanover, VA; Henrico, VA; King William, VA; New Kent, VA; Powhatan, VA; Prince George, VA; City of Hopewell, VA; City of Richmond, VA; Caroline, VA; Essex, VA; Hanover, VA; King and Queen, VA; King William, VA; Lancaster, VA; Middlesex, VA; Northumberland, VA; Richmond, VA; Westmoreland, VA and 6 more areas |
| Headline | Severe Thunderstorm Warning issued August 10 at 6:15PM EDT until August 10 at 7:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-10T19:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f51227b98e4e259ef125f320c0b6b34a52c7b236.001.1","noaa_urn:oid:2.49.0.1.840.0.4b6def6ab9cddf9eca462181039a7b0d6bd974b8.001.1","noaa_urn:oid:2.49.0.1.840.0.fbe6f2410869fb1ab0bda8c61c9f9bf0e79f7f53.001.1","noaa_urn:oid:2.49.0.1.840.0.2e9bfa66f6434e3d0a53819adfcdd544c650f3b4.001.1","noaa_urn:oid:2.49.0.1.840.0.5df0c65b2816725c6043bb1394200f5966a5395a.002.1","noaa_urn:oid:2.49.0.1.840.0.1d4c9569cc4c1b619b1350f6ef7531d587276f69.001.1","noaa_urn:oid:2.49.0.1.840.0.5bce5eb63568efb16e2ed0a7d82f739d91c8818a.001.1","noaa_urn:oid:2.49.0.1.840.0.5e69d9e9698d04480e94961ba7e5418052b82e9a.002.1","noaa_urn:oid:2.49.0.1.840.0.203d87ba29828d33232d627c92f938ab53d26d23.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 N Hadensville |
| Iem County | Goochland |
| Iem State | VA |
| Iem Wfo | AKQ |
| Iem Remark | Trees downed at the intersection of Three Chopt Rd and Walton Rd. VA-699 closed in both directions in this location. |
| MergedSources | [{"id":"iem_D_37.860_-78.000_1786396800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786396800000,"latitude":37.86,"longitude":-78}] |
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.
Want to know when something happens near Chester?
Calamity.live data shows a weather event with CalamityScore 48/100, near Chester (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.