This alert expired on 4 September 2026 at 21:00 UTC. It is kept here as a record.
It is the 12th strongest of the 35 detections recorded within 20 km of this point since 2 April 2026. The last comparable one was on 28 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 4 at 4:36PM EDT until September 4 at 5:00PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 2 April 2026
- June 14, 2026 · score 22 · 16.0 km
- June 12, 2026 · score 22 · 17.2 km
- May 13, 2026 · score 34 · 24.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 37.8968, -79.8408 |
| Nearest City | Salem (70 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-04T20:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8465922ae0ef3e51b2cd666a8897f302c940aac9.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Greene, VA; Madison, VA; Albemarle, VA; Orange, VA; Clay, WV; Fayette, WV; Nicholas, WV; Pocahontas, WV; Webster, WV and 15 more areas |
| Headline | Severe Thunderstorm Warning issued September 4 at 4:36PM EDT until September 4 at 5:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-09-04T17:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 18 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8465922ae0ef3e51b2cd666a8897f302c940aac9.002.1","noaa_urn:oid:2.49.0.1.840.0.bfd16150b1bcf3b651f82f659d07610633e3150a.001.1","noaa_urn:oid:2.49.0.1.840.0.4357f4d052b711f39a6a224d0bf5e9c01635edb6.001.1","noaa_urn:oid:2.49.0.1.840.0.7ce954db32fbcdf585d986f5bc5c466c50ec84fa.001.1","noaa_urn:oid:2.49.0.1.840.0.11033a7870d7dbc208a41fa4f2f7b62dfdc45b01.001.1","noaa_urn:oid:2.49.0.1.840.0.b53ebfaa813d3e111f7a58f584f7933ee4235fb4.001.1","noaa_urn:oid:2.49.0.1.840.0.6d179c4fc3f0e98c9faf8b5fed21ee5ccf913efd.001.1","noaa_urn:oid:2.49.0.1.840.0.cd260441f22025ca4adf8ccc9b80aad536210d79.001.1","noaa_urn:oid:2.49.0.1.840.0.2c15af613d5194263cecda75c509982fa0212e12.001.1","noaa_urn:oid:2.49.0.1.840.0.a1378c7f427d96a45af0f2b65ce77e52da2abe78.001.1","noaa_urn:oid:2.49.0.1.840.0.a943ab978b40a7daf10057e02c036d8e4fcc01cc.001.1","noaa_urn:oid:2.49.0.1.840.0.ae25ae5eab49904ae6462a450e6e3ecc1688e425.001.1","noaa_urn:oid:2.49.0.1.840.0.da1fcb54bd9705caff0423db82789ed0f9151f01.001.1","noaa_urn:oid:2.49.0.1.840.0.e89a1c4cdcecb226e23b8ae5b133846f23e55a50.001.1","noaa_urn:oid:2.49.0.1.840.0.9d89659fc6a573e5ad6700e9619ec6d31f8f90c8.001.1","noaa_urn:oid:2.49.0.1.840.0.93f431ab12d70eacf86e6c4021856cf555487b91.001.1","noaa_urn:oid:2.49.0.1.840.0.3ac0a013599259deeb9d1af443bed59817222046.002.1","noaa_urn:oid:2.49.0.1.840.0.b8f641aa3b0638f932e6de1eff49f0f2ca0cfdb5.001.1"] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.