Right now
The most recent data we hold from NOAA arrived 1 minute 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 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 185 recorded within 20 km of this point since 16 March 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 21 at 7:35PM EDT until July 21 at 7:45PM EDT by NWS Pittsburgh PA
Urban PEI: 217,734 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 6, 2026 · score 43 · 5.2 km
- July 4, 2026 · score 43 · 5.9 km
- July 10, 2026 · score 43 · 6.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 67 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 | Critical |
| Calamity Score (ours) | 67 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 40.9472, -80.2368 |
| Nearest City | New Castle (11 km) |
| Urban exposure index (PEI) | 217.7K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-21T23:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.77925705fa0e48efbe34c209b62d4289 |
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: 2026-07-21T23:35:00.000Z.
First archived: 2026-07-21T23:40:30.073Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lawrence, PA; Butler, PA; Lawrence, PA; Carroll, OH and 1 more areas |
| Headline | Tornado Warning issued July 21 at 7:35PM EDT until July 21 at 7:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-21T19:45:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.77925705fa0e48efbe34c209b62d4289550cef4b.001.1","noaa_urn:oid:2.49.0.1.840.0.41462b4b7873b4c86565ad104c52c48c9586febd.001.1","noaa_urn:oid:2.49.0.1.840.0.b9ea6b4e113b2ad10eff37771259b64882674d9a.001.1","noaa_urn:oid:2.49.0.1.840.0.85898a923ffe6d37fd9319255b4986f6f37c913b.001.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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