This alert expired on 18 July 2026 at 21:15 UTC. It is kept here as a record.
No stronger detection stands among the 41 recorded within 20 km of this point since 17 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 18 at 4:45PM EDT until July 18 at 5:15PM EDT by NWS Pittsburgh PA
Nearby, since 17 March 2026
- July 19, 2026 · score 22 · 12.2 km
- June 14, 2026 · score 46 · 13.1 km
- July 4, 2026 · score 22 · 17.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 59 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 59% |
| Coordinates | 40.9771, -78.9043 |
| Nearest City | Altoona (67 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-18T20:45:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e5bf969d2449b31274363bbfc1552eb49c25a2f1.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jefferson, PA |
| Headline | Tornado Warning issued July 18 at 4:45PM EDT until July 18 at 5:15PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-18T17:15:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.