This alert expired on 21 July 2026 at 21:00 UTC. It is kept here as a record.
It is the 97th strongest of the 193 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 Warning issued July 21 at 4:34PM EDT until July 21 at 5:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 1,766,023 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 16, 2026 · score 52 · 3.4 km
- August 7, 2026 · score 52 · 3.9 km
- June 22, 2026 · score 52 · 4.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 79 % 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) | 46 / 100 |
| Our confidence | 79% |
| Coordinates | 39.2855, -76.1518 |
| Nearest City | Edgewood (19 km) |
| Population Exposed | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T20:34:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Anne Arundel, MD; Calvert, MD; Charles, MD; Prince Georges, MD; Charles, MD; Prince Georges, MD; Chester, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 4:34PM EDT until July 21 at 5:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-21T17:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.866932b8b2cb50c26d078e18f304f5be90719c17.001.1","noaa_urn:oid:2.49.0.1.840.0.9a1776ed6169d73416ac5d44cc3be88a701f1d54.002.1","noaa_urn:oid:2.49.0.1.840.0.6c24dc889894de7afee86951fbe3dbd3618195bd.001.1","noaa_urn:oid:2.49.0.1.840.0.9865d103731a858b9fb94398b7c8b6bb45a72ea3.001.1","noaa_urn:oid:2.49.0.1.840.0.73e1c86203107f7854c32759b0140cf61f5288f4.001.1","noaa_urn:oid:2.49.0.1.840.0.a496c7d6821e4affb467f50f6ed8956ef7fa6291.001.1","noaa_urn:oid:2.49.0.1.840.0.9c8537af120e6b0682cc050197b8ef0dff4fbd7f.001.1","noaa_urn:oid:2.49.0.1.840.0.a2824d2f61ecab06edb5dfe4ce6770d0c940f36d.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 46/100, near Edgewood (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.