This alert expired on 3 September 2026 at 03:00 UTC. It is kept here as a record.
It is the 9th strongest of the 25 detections recorded within 20 km of this point since 15 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 10:19PM EDT until September 2 at 11:00PM EDT by NWS Cleveland OH
Nearby, since 15 April 2026
- July 11, 2026 · score 22 · 13.1 km
- June 14, 2026 · score 46 · 13.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 71% |
| Coordinates | 41.8227, -77.8945 |
| Nearest City | Elmira (94 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T02:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.1da77ce21b6583ef3a0fe755ba5ace171f1c682a.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Erie, PA; Allegany, NY; Lycoming, PA; Sullivan, PA; Tioga, PA and 3 more areas |
| Headline | Severe Thunderstorm Warning issued September 2 at 10:19PM EDT until September 2 at 11:00PM EDT by NWS Cleveland OH |
| Expires | 2026-09-02T23:00:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1da77ce21b6583ef3a0fe755ba5ace171f1c682a.001.1","noaa_urn:oid:2.49.0.1.840.0.7700b446caf3e1408cbc931e70244915214e7734.001.1","noaa_urn:oid:2.49.0.1.840.0.61e95e748f218b61660fa92a17d5f59570144226.001.1","noaa_urn:oid:2.49.0.1.840.0.f7608fb7b46f90f05f1b870cdd0483f1d4e81b2c.001.1","noaa_urn:oid:2.49.0.1.840.0.7aa53114f2365ab993d7703847ac0e7b96dad740.001.1","noaa_urn:oid:2.49.0.1.840.0.f9d1c3e64b85c6eb3d298aacb7dfe9e939e1fc91.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 5 N Denton Hill State P |
| Spc County | Potter |
| Spc State | PA |
| Spc Comments | Tree down partially blocking South Brookland Road. Likely associated with the outflow boundary out ahead of the line of storms. (CTP) |
| Iem TypeSummary | D |
| Iem City | 5 N Denton Hill State P |
| Iem County | Potter |
| Iem State | PA |
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 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 in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.