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 17:00 UTC. It is kept here as a record.
It is the 10th strongest of the 41 detections recorded within 20 km of this point since 22 March 2026. The last comparable one was on 1 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 12:14PM EDT until July 21 at 1:00PM EDT by NWS Pittsburgh PA
Urban PEI: 17,484 within a heuristic 50 km radius; not unique people.
Nearby, since 22 March 2026
- July 21, 2026 · score 34 · 1.6 km
- September 20, 2026 · score 28 · 12.2 km
- June 14, 2026 · score 43 · 15.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 40.2955, -81.2522 |
| Nearest City | New Philadelphia (27 km) |
| Urban exposure index (PEI) | 17.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T16:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.00aac0133546278ff6b6ac459d383a1a |
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: 2026-07-21T16:14:00.000Z.
First archived: 2026-07-21T16:19:49.880Z. 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 | Carroll, OH; Columbiana, OH; Jefferson, OH; Beaver, PA; Butler, PA; Lawrence, PA; Hancock, WV; Stark, OH; Summit, OH; Athens, OH; Washington, OH; Pleasants, WV; Wood, WV |
| Headline | Severe Thunderstorm Warning issued July 21 at 12:14PM EDT until July 21 at 1:00PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-21T13:00:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.00aac0133546278ff6b6ac459d383a1a5df7ce27.001.1","noaa_urn:oid:2.49.0.1.840.0.37c8a611c42612f4bf80726c2264b5a339d714be.002.1","noaa_urn:oid:2.49.0.1.840.0.56bd219ece905613cde8025b2e57f5a86858d84e.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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