This alert expired on 16 March 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 152 recorded within 20 km of this point since 11 March 2026 — 14 others scored the same. The last comparable one was on 11 March 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued March 16 at 11:30AM EDT until March 16 at 7:00PM EDT by NWS State College PA
An estimated 29,201 people live within 50 km of this point.
Nearby, since 11 March 2026
- September 2, 2026 · score 46 · 0.0 km
- August 28, 2026 · score 28 · 0.0 km
- August 27, 2026 · score 34 · 0.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 | High |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 88% |
| Coordinates | 41.2000, -77.2000 |
| Nearest City | Williamsport (17 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T15:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.fcca3865a5b9677c3958ecf417f40ecee20e8476.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Adams, PA; Columbia, PA; Cumberland, PA; Dauphin, PA; Franklin, PA; Juniata, PA; Lancaster, PA; Lebanon, PA; Mifflin, PA; Montour, PA; Northumberland, PA; Perry, PA; Schuylkill, PA; Snyder, PA; Union, PA; York, PA |
| Headline | Tornado Watch issued March 16 at 11:30AM EDT until March 16 at 7:00PM EDT by NWS State College PA |
| Expires | 2026-03-16T19:00:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | false |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 SE Mcelhattan |
| Spc County | Clinton |
| Spc State | PA |
| Spc Comments | Trees down on wires. (CTP) |
| Iem TypeSummary | D |
| Iem City | 2 SE Mcelhattan |
| Iem County | Clinton |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | Trees down on wires. |
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.
Want to know when something happens near Williamsport?
Calamity.live data shows a weather event with CalamityScore 46/100, near Williamsport (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.