Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 21 July 2026 at 20:15 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 3:23PM EDT until July 21 at 4:15PM EDT by NWS Wilmington OH
Urban PEI: 378,804 within a heuristic 50 km radius; not unique people.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 38.6907, -82.8010 |
| Nearest City | Portsmouth (18 km) |
| Urban exposure index (PEI) | 378.8K within 50 km |
| Impact Tier | significant |
| Date | 2026-07-21, time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6ca11af7b8556419c2f1cb7d8aae1eb5 |
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: 2026-07-21, time not reported.
First archived: 2026-07-21T19:24:06.869Z. 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 | Fayette, OH; Highland, OH; Pickaway, OH; Ross, OH; Guernsey, OH; Muskingum, OH; Noble, OH; Brown, OH and 13 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 3:23PM EDT until July 21 at 4:15PM EDT by NWS Wilmington OH |
| Expires | 2026-07-21T16:15:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 16 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6ca11af7b8556419c2f1cb7d8aae1eb5a16fcf73.001.1","noaa_urn:oid:2.49.0.1.840.0.12874980683d835675a02fab0f5ba05d58d558c0.001.1","noaa_urn:oid:2.49.0.1.840.0.1ae602fbdd9ac90a3a6a266690d1c433c68288c5.002.1","noaa_urn:oid:2.49.0.1.840.0.fd898c2d86f62bfb94c59076c644b216026e89c2.002.1","noaa_urn:oid:2.49.0.1.840.0.f6e1183cde80fce5f28f7897ecfa6030346b18ab.001.1","noaa_urn:oid:2.49.0.1.840.0.3d6e377f7f0a94cd2188443dbff41557da88c7de.001.1","noaa_urn:oid:2.49.0.1.840.0.85146fbd70c755def9b5d7a5f4dc3d79eed01ba4.001.1","noaa_urn:oid:2.49.0.1.840.0.2ff7031c2508f0e2ccd2407e9f3a926c8ec18a05.001.1","noaa_urn:oid:2.49.0.1.840.0.675dd60670950d8845b1fb6a082ba8ffd8ad0c5a.001.1","noaa_urn:oid:2.49.0.1.840.0.b4f2dbc51cb95c5ef3e53eb241ff520bc424f8b5.001.1","noaa_urn:oid:2.49.0.1.840.0.be3cb772b82f4c7b9951961c13401311d6ff7b51.001.1","noaa_urn:oid:2.49.0.1.840.0.e2314723b8269c775b76e1fba1672eb0a6c0df28.001.1","noaa_urn:oid:2.49.0.1.840.0.e6428233ea5ba8d145b3c3fe43a896b348ffc23d.002.1","noaa_urn:oid:2.49.0.1.840.0.c12047b8472026f9d3f0475ca437706ef8935cc0.001.1","noaa_urn:oid:2.49.0.1.840.0.e838fb9d5e733554303e325581f764da80fd893d.001.1","noaa_urn:oid:2.49.0.1.840.0.64436041ee0866d350de4ed474ff9074e5a7f895.001.1"] |
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?