Right now
The most recent data we hold from NOAA arrived 1 minute 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 22 July 2026 at 00:15 UTC. It is kept here as a record.
It is the 12th strongest of the 28 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 7:48PM EDT until July 21 at 8:15PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 17 March 2026
- July 5, 2026 · score 22 · 17.5 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.
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) | 16 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 38.6532, -79.4983 |
| Nearest City | Harrisonburg (59 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-21T23:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b707822d395af9af198da0a072b46f01 |
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: 2026-07-21T23:48:00.000Z.
First archived: 2026-07-21T23:50:53.143Z. 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 | Clarke, VA; Fauquier, VA; Loudoun, VA; Warren, VA; Braxton, WV; Lewis, WV; Pocahontas, WV; Randolph, WV; Upshur, WV; Webster, WV; Boone, WV; Kanawha, WV; Lincoln, WV and 4 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 7:48PM EDT until July 21 at 8:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-21T20:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b707822d395af9af198da0a072b46f01a074c058.001.1","noaa_urn:oid:2.49.0.1.840.0.16adb08311289675aea1b38ede628f36248cb3a5.001.1","noaa_urn:oid:2.49.0.1.840.0.766cc7e2c3f8075c9baabb2b1f80962e9dc5dc2f.001.1","noaa_urn:oid:2.49.0.1.840.0.4488ad36c563dee419efe18793de80d2da03011e.002.1","noaa_urn:oid:2.49.0.1.840.0.ba75989e0b406f3d652ba053df47b537a8073f50.001.1","noaa_urn:oid:2.49.0.1.840.0.c8e441d186dda370bb036431e55ae5cbcfe30fc7.001.1","noaa_urn:oid:2.49.0.1.840.0.cdf60e13cd2a4be36ae17baf49e962abfc3462be.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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?