Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 12 June 2026 at 04:00 UTC. It is kept here as a record.
It is the 115th strongest of the 168 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 11 at 7:53PM EDT until June 12 at 12:00AM EDT by NWS Baltimore MD/Washington DC
An estimated 217,596 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 10, 2026 · score 37 · 2.4 km
- August 3, 2026 · score 37 · 5.1 km
- May 27, 2026 · score 43 · 8.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. 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 | 79% |
| Coordinates | 39.2600, -75.8500 |
| Nearest City | Middletown (24 km) |
| Population Exposed | 217.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.958fd0d1fa2f5f2e37b2f3c40870afa3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Calvert, MD; Cecil, MD; Charles, MD; St. Marys, MD; King George, VA; Stafford, 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; Tidal Potomac from Key Bridge to Indian Head MD; Patapsco River including Baltimore Harbor; District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Carroll, MD; Frederick, MD; Harford, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; Baltimore City, MD; Arlington, VA; Culpeper, VA; Fairfax, VA; Fauquier, VA; Loudoun, VA; Prince William, VA; Rappahannock, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; City of Manassas, VA; City of Manassas Park, VA and 7 more areas |
| Headline | Severe Thunderstorm Watch issued June 11 at 7:53PM EDT until June 12 at 12:00AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-12T00:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.958fd0d1fa2f5f2e37b2f3c40870afa3609fcb9b.004.1","noaa_urn:oid:2.49.0.1.840.0.958fd0d1fa2f5f2e37b2f3c40870afa3609fcb9b.003.1","noaa_urn:oid:2.49.0.1.840.0.958fd0d1fa2f5f2e37b2f3c40870afa3609fcb9b.002.1","noaa_urn:oid:2.49.0.1.840.0.958fd0d1fa2f5f2e37b2f3c40870afa3609fcb9b.005.1","noaa_urn:oid:2.49.0.1.840.0.7b9a8257bc60e3d62cfdb1de0feb22c05f972f92.002.1","noaa_urn:oid:2.49.0.1.840.0.7b9a8257bc60e3d62cfdb1de0feb22c05f972f92.001.1","noaa_urn:oid:2.49.0.1.840.0.52210a5c82bfe0e0c12fcf280b3528dcdd476a7c.002.1","noaa_urn:oid:2.49.0.1.840.0.52210a5c82bfe0e0c12fcf280b3528dcdd476a7c.001.1","noaa_urn:oid:2.49.0.1.840.0.06aee1665b2a443edd7ff2d5c89813dfd546f2b6.002.1","noaa_urn:oid:2.49.0.1.840.0.06aee1665b2a443edd7ff2d5c89813dfd546f2b6.001.1"] |
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 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.
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