Right now
The most recent data we hold from NOAA arrived 5 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 16:15 UTC. It is kept here as a record.
It is the 15th strongest of the 74 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 6 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 11:47AM EDT until July 21 at 12:15PM EDT by NWS Charleston WV
Urban PEI: 73,484 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- July 21, 2026 · score 63 · 10.1 km
- August 10, 2026 · score 43 · 16.1 km
- September 17, 2026 · 18.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 39.9141, -81.9709 |
| Nearest City | Zanesville (4 km) |
| Urban exposure index (PEI) | 73.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T15:47:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3252c7cbea20e3010ac5c83fc6b4a291 |
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: 2026-07-21T15:47:00.000Z.
First archived: 2026-07-21T15:54:14.157Z. 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 | Athens, OH; Morgan, OH; Washington, OH; Stark, OH; Summit, OH; Wayne, OH; Hocking, OH |
| Headline | Severe Thunderstorm Warning issued July 21 at 11:47AM EDT until July 21 at 12:15PM EDT by NWS Charleston WV |
| Expires | 2026-07-21T12:15:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3252c7cbea20e3010ac5c83fc6b4a291b188a768.001.1","noaa_urn:oid:2.49.0.1.840.0.1a5ea9d5abadfb3b7ea88ddd910c64ef08a77c05.001.1","noaa_urn:oid:2.49.0.1.840.0.86fc73a6697711cb9db49be5e40d97326524ee5f.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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