This alert expired on 22 June 2026 at 21:15 UTC. It is kept here as a record.
It is the 8th strongest of the 127 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 15 June 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 22 at 4:48PM EDT until June 22 at 5:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 1,502,309 people live within 50 km of this point.
Nearby, since 11 March 2026
- July 6, 2026 · score 52 · 2.4 km
- March 16, 2026 · score 52 · 4.9 km
- August 28, 2026 · score 52 · 9.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 77 % 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) | 52 / 100 |
| Our confidence | 77% |
| Coordinates | 39.5093, -76.2353 |
| Nearest City | Aberdeen (6 km) |
| Population Exposed | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-22T20:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e6a871f0b21e160a8d7b41b3e5c5ea8f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Anne Arundel, MD; Howard, MD; Prince Georges, MD; Berks, PA; Chester, PA; Delaware, PA; Montgomery, PA |
| Headline | Severe Thunderstorm Warning issued June 22 at 4:48PM EDT until June 22 at 5:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-22T17:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e6a871f0b21e160a8d7b41b3e5c5ea8ff97ed284.001.1","noaa_urn:oid:2.49.0.1.840.0.f4391392fab887f60e156ae1de00b853c894295a.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.
Want to know when something happens near Aberdeen?
Calamity.live data shows a weather event with CalamityScore 52/100, near Aberdeen (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.