Right now
The most recent data we hold from NOAA arrived 2 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 21 July 2026 at 23:15 UTC. It is kept here as a record.
It is the 28th strongest of the 83 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 6:57PM EDT until July 21 at 7:15PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 95,476 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 28, 2026 · score 39 · 7.3 km
- September 5, 2026 · score 32 · 8.1 km
- August 11, 2026 · score 39 · 10.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 32 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 38.1776, -81.9964 |
| Nearest City | Charleston (37 km) |
| Urban exposure index (PEI) | 95.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T22:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7bc734267dfd4e701acf6f20db626e4b |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-21T22:57:00.000Z.
First archived: 2026-07-21T22:59:32.183Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hampshire, WV; Hardy, WV; Tucker, WV; Frederick, VA; City of Winchester, VA and 10 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 6:57PM EDT until July 21 at 7:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-21T19:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7bc734267dfd4e701acf6f20db626e4b728b1ed2.002.1","noaa_urn:oid:2.49.0.1.840.0.5f14e1cad28ba1c06300bf7feb5b6c90122671a7.001.1","noaa_urn:oid:2.49.0.1.840.0.e3c1fc40edc2b09d6b1cb2959aa8f75984bb304b.001.1","noaa_urn:oid:2.49.0.1.840.0.16d1126ed42811c3da4fdf58b375278529b1c897.001.1","noaa_urn:oid:2.49.0.1.840.0.36617ab59e30c092fa6898f64df1547cc0debbea.001.1","noaa_urn:oid:2.49.0.1.840.0.f9b2908f3c363dc26294436363833ced3cae0845.001.1","noaa_urn:oid:2.49.0.1.840.0.2b19ee38941aa65eec5558bb39b1b9acd926c5bf.001.1","noaa_urn:oid:2.49.0.1.840.0.fb8212e272c130eca6e3a6ecf3b690c080804f2f.001.1","noaa_urn:oid:2.49.0.1.840.0.157e91cc7095d06e59338f70d6e73155a8eacb9f.001.1","noaa_urn:oid:2.49.0.1.840.0.0d1a0a894d7227cd81ebf5e7232341f7a4f81590.001.1","noaa_urn:oid:2.49.0.1.840.0.02119db7658d635c70d527ab2cb7dd96b2c6c49d.001.1","noaa_urn:oid:2.49.0.1.840.0.32e168cd111d91488626e93efdaa0960f4bf3364.001.1","noaa_urn:oid:2.49.0.1.840.0.b5d4874c3febb8b092582da174a2860ccebc04de.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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