This alert expired on 28 August 2026 at 00:45 UTC. It is kept here as a record.
It is the strongest of the 142 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Tornado Warning issued August 27 at 8:24PM EDT until August 27 at 8:45PM EDT by NWS State College PA
An estimated 239,408 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 4, 2026 · score 43 · 4.8 km
- August 31, 2026 · score 43 · 8.4 km
- March 17, 2026 · score 43 · 10.2 km
How we know
Confirmed by 19 independent sources, including NOAA.
Our own score for this event is 67 out of 100, at 90 % 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) | 67 / 100 |
| Our confidence | 90% |
| Coordinates | 40.1000, -76.1733 |
| Nearest City | Lancaster (13 km) |
| Population Exposed | 239.4K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-08-28T00:24:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lancaster, PA |
| Headline | Tornado Warning issued August 27 at 8:24PM EDT until August 27 at 8:45PM EDT by NWS State College PA |
| Expires | 2026-08-27T20:45:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 1 NE Cornwall |
| Spc County | Lebanon |
| Spc State | PA |
| Spc Comments | Tree down. (CTP) |
| Iem TypeSummary | F |
| Iem City | 1 E North Coventry Twp |
| Iem County | Chester |
| Iem State | PA |
| Iem Wfo | PHI |
| Iem Remark | Flooding on 422 near East Coventry Township, resulting in an accident. Time estimated. |
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 67/100, near Lancaster (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.