This alert expired on 19 May 2026 at 01:30 UTC. It is kept here as a record.
It is the 15th strongest of the 99 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 9:12PM EDT until May 18 at 9:30PM EDT by NWS State College PA
An estimated 29,201 people live within 50 km of this point.
Nearby, since 11 March 2026
- August 28, 2026 · score 28 · 13.1 km
- August 27, 2026 · score 34 · 13.1 km
- August 10, 2026 · score 34 · 13.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 85% |
| Coordinates | 41.0840, -77.2270 |
| Nearest City | Williamsport (26 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T01:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ef56047d4fd79a53f7a951b10fd031d5d7a05948.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, PA; Lycoming, PA |
| Headline | Severe Thunderstorm Warning issued May 18 at 9:12PM EDT until May 18 at 9:30PM EDT by NWS State College PA |
| Expires | 2026-05-18T21:30:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 1 SSW Park Forest |
| Iem County | Centre |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | Tree fell down onto garage and car, possibly also impacting the roof of a residence. No injuries reported. |
| MergedSources | [{"id":"iem_D_40.790_-77.920_1779150240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779150240000,"latitude":40.79,"longitude":-77.92}] |
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 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 34/100, near Williamsport (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.