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 20:45 UTC. It is kept here as a record.
It is the 19th strongest of the 31 detections recorded within 20 km of this point since 18 June 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 4:25PM EDT until July 21 at 4:45PM EDT by NWS Wilmington OH
Urban PEI: 20,409 within a heuristic 50 km radius; not unique people.
Nearby, since 18 June 2026
- September 10, 2026 · score 37 · 12.7 km
- August 5, 2026 · score 43 · 20.8 km
- September 20, 2026 · score 37 · 20.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 38.8184, -83.0420 |
| Nearest City | Portsmouth (10 km) |
| Urban exposure index (PEI) | 20.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T20:27:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.58f38602d02d715205370060f145dd79 |
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: 2026-07-21T20:27:00.000Z.
First archived: 2026-07-21T20:35:59.323Z. 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 | Fairfield, OH; Athens, OH; Gallia, OH; Jackson, OH; Meigs, OH; Vinton, OH; Mason, WV; Doddridge, WV; Harrison, WV; Tyler, WV and 11 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 4:25PM EDT until July 21 at 4:45PM EDT by NWS Wilmington OH |
| Expires | 2026-07-21T16:45:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.58f38602d02d715205370060f145dd7926f39c7c.001.1","noaa_urn:oid:2.49.0.1.840.0.f87884e6aa1a76f2873273d3867110acdfb66677.001.1","noaa_urn:oid:2.49.0.1.840.0.46e04899e4819e865243a0b94c8308c16d23490d.001.1","noaa_urn:oid:2.49.0.1.840.0.1e4c1300f5872297da75621d08860bb49d4790ce.001.1","noaa_urn:oid:2.49.0.1.840.0.a226a8d58ec64498eac891913e01b16e9038392a.001.1","noaa_urn:oid:2.49.0.1.840.0.edde3cacd7ade34323179da306f057e924a3c32b.001.1","noaa_urn:oid:2.49.0.1.840.0.e26d5f73983b3d7b34233f7d96c07bffe865052c.001.1","noaa_urn:oid:2.49.0.1.840.0.36cffd1980405570452e1fdae0a7f184d0506b8c.001.1","noaa_urn:oid:2.49.0.1.840.0.86f4d084aaebd230bfffbaed494538adda2c0bb9.001.1","noaa_urn:oid:2.49.0.1.840.0.0d21f9707c16c94d08829fdcbcbec4ac68111e1d.001.1","noaa_urn:oid:2.49.0.1.840.0.678b831dc0fba5e40ec3a447b129a261a66141d9.001.1","noaa_urn:oid:2.49.0.1.840.0.e25b8082f8b7b057149a8287dbbf4595f4fd5651.001.1","noaa_urn:oid:2.49.0.1.840.0.6e361de4092d9f3f95f35a9ed918b00e2f03d840.001.1","noaa_urn:oid:2.49.0.1.840.0.546e2dca33416c76a2e880f1324af2fa95f762a3.001.1"] |
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 near Portsmouth?