This alert expired on 19 July 2026 at 00:30 UTC. It is kept here as a record.
It is the strongest of the 45 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 10 July 2026. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 18 at 8:19PM EDT until July 18 at 8:30PM EDT by NWS State College PA
An estimated 87,505 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 2, 2026 · score 39 · 7.9 km
- July 28, 2026 · score 39 · 11.5 km
- July 5, 2026 · score 39 · 15.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 63 out of 100, at 79 % 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) | 63 / 100 |
| Our confidence | 79% |
| Coordinates | 40.7529, -78.2686 |
| Nearest City | Altoona (28 km) |
| Population Exposed | 87.5K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-19T00:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d27cb6e9a9d7cb69a340be9817064c519559b9e0.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Blair, PA; Centre, PA; Clearfield, PA |
| Headline | Tornado Warning issued July 18 at 8:19PM EDT until July 18 at 8:30PM EDT by NWS State College PA |
| Expires | 2026-07-18T20:30:00-04:00 |
| SenderName | NWS State College 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 63/100, near Altoona (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.