Right now
The most recent data we hold from NOAA arrived 9 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 19:45 UTC. It is kept here as a record.
It is the 12th strongest of the 63 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 3:32PM EDT until July 21 at 3:45PM EDT by NWS Pittsburgh PA
Urban PEI: 378,804 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 12, 2026 · score 37 · 6.5 km
- June 18, 2026 · score 67 · 6.9 km
- July 28, 2026 · score 37 · 10.2 km
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 | 38.6846, -82.6097 |
| Nearest City | Ashland (23 km) |
| Urban exposure index (PEI) | 378.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T19:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.53853f813403d8d25c8e4b285f22d335 |
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: 2026-07-21T19:32:00.000Z.
First archived: 2026-07-21T19:39:25.713Z. 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 | Guernsey, OH; Muskingum, OH; Noble, OH; Adams, OH; Brown, OH; Fayette, OH; Highland, OH; Pickaway, OH; Ross, OH and 8 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 3:32PM EDT until July 21 at 3:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-21T15:45:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 11 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.53853f813403d8d25c8e4b285f22d3353fd33d86.001.1","noaa_urn:oid:2.49.0.1.840.0.d5b75231f87ac60747a5f6bf8941830261df743e.002.1","noaa_urn:oid:2.49.0.1.840.0.6ca11af7b8556419c2f1cb7d8aae1eb5a16fcf73.001.1","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:2.49.0.1.840.0.2ff7031c2508f0e2ccd2407e9f3a926c8ec18a05.001.1","noaa_urn:oid:2.49.0.1.840.0.675dd60670950d8845b1fb6a082ba8ffd8ad0c5a.001.1","noaa_urn:oid:2.49.0.1.840.0.17a22badbfcb50217e657969cbef833af8aac22e.002.1","noaa_urn:oid:2.49.0.1.840.0.da9752e85d86ca9a8966e82792f80397e196e1f2.001.1","noaa_urn:oid:2.49.0.1.840.0.97ccbc3942e6e6ca45e786968f9aeeeb883eb9e6.002.1","noaa_urn:oid:2.49.0.1.840.0.e838fb9d5e733554303e325581f764da80fd893d.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.
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