This alert expired on 12 June 2026 at 00:45 UTC. It is kept here as a record.
It is the 65th strongest of the 99 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 27 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 8:20PM EDT until June 11 at 8:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 977,911 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 9, 2026 · score 48 · 2.7 km
- March 17, 2026 · score 48 · 7.3 km
- March 16, 2026 · score 48 · 7.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 80 % 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) | 41 / 100 |
| Our confidence | 80% |
| Coordinates | 38.5412, -77.5280 |
| Nearest City | Montclair (18 km) |
| Population Exposed | 977.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.83324fb165f91fdf528c3850a2391459 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Culpeper, VA; Orange, VA; Spotsylvania, VA; District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Carroll, MD; Charles, MD; Frederick, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; Arlington, VA; Culpeper, VA; Fairfax, VA; Fauquier, VA; King George, VA; Loudoun, VA; Madison, VA; Orange, VA; Prince William, VA; Spotsylvania, VA; Stafford, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; City of Fredericksburg, VA; City of Manassas, VA; City of Manassas Park, VA |
| Headline | Severe Thunderstorm Warning issued June 11 at 8:20PM EDT until June 11 at 8:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-11T20:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.83324fb165f91fdf528c3850a23914595a83e1b2.001.1","noaa_urn:oid:2.49.0.1.840.0.5d610d63514f7f980bf1116ab0e22019e79fa01e.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 41/100, near Montclair (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.