This alert expired on 11 August 2026 at 01:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 184 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 10 at 4:43PM EDT until August 10 at 9:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 240,254 people live within 50 km of this point.
Nearby, since 11 March 2026
- July 28, 2026 · score 67 · 8.1 km
- May 27, 2026 · score 43 · 9.4 km
- March 12, 2026 · score 43 · 12.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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 | 81% |
| Coordinates | 39.3250, -75.6625 |
| Nearest City | Middletown (15 km) |
| Population Exposed | 240.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T20:43:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Cecil, MD; Charles, MD; Harford, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; St. Marys, MD; Baltimore City, MD; Albemarle, VA; Arlington, VA; Culpeper, VA; Fairfax, VA; Fauquier, VA; Greene, VA; King George, VA; Madison, VA; Nelson, VA; Orange, VA; Prince William, VA; Spotsylvania, VA; Stafford, VA; City of Alexandria, VA; City of Charlottesville, VA; City of Fairfax, VA; City of Falls Church, VA; City of Fredericksburg, VA; City of Manassas, VA; City of Manassas Park, VA; Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Chesapeake Bay from Sandy Point to North Beach MD; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; Tangier Sound and the inland waters surrounding Bloodsworth Island; Dorchester, MD; Somerset, MD; Wicomico, MD; Worcester, MD; Accomack, VA; Amelia, VA; Caroline, VA; Charles City, VA; Chesterfield, VA; Cumberland, VA; Dinwiddie, VA; Essex, VA; Fluvanna, VA; Gloucester, VA; Goochland, VA; Hanover, VA; Henrico, VA; James City, VA; King and Queen, VA; King William, VA; Lancaster, VA; Louisa, VA; Mathews, VA; Middlesex, VA; New Kent, VA; Northumberland, VA; Nottoway, VA; Powhatan, VA; Prince Edward, VA; Prince George, VA; Richmond, VA; Westmoreland, VA; City of Colonial Heights, VA; City of Hopewell, VA; City of Petersburg, VA; City of Richmond, VA; City of Williamsburg, VA and 5 more areas |
| Headline | Severe Thunderstorm Watch issued August 10 at 4:43PM EDT until August 10 at 9:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-10T21:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f85ba0a37bc843e42c5888da6839d0dbe9e4d31c.002.1","noaa_urn:oid:2.49.0.1.840.0.f85ba0a37bc843e42c5888da6839d0dbe9e4d31c.003.1","noaa_urn:oid:2.49.0.1.840.0.65452891555bc3ae6e9ffab8b82c5240e8c85498.001.1","noaa_urn:oid:2.49.0.1.840.0.65452891555bc3ae6e9ffab8b82c5240e8c85498.002.1","noaa_urn:oid:2.49.0.1.840.0.852a434ee8ba51780920e1f27f84f68e058bedbd.001.1","noaa_urn:oid:2.49.0.1.840.0.852a434ee8ba51780920e1f27f84f68e058bedbd.002.1","noaa_urn:oid:2.49.0.1.840.0.d2badca77ab7b174bf4acb19fb7486008ff88ec7.002.1","noaa_urn:oid:2.49.0.1.840.0.d2badca77ab7b174bf4acb19fb7486008ff88ec7.001.1"] |
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, near Middletown (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.