This alert is in force until 3 September 2026, 07:30 UTC.
It is the 7th strongest of the 9 detections recorded within 20 km of this point since 14 June 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 2 at 11:38PM EDT until September 3 at 3:30AM EDT by NWS Cleveland OH
Nearby, since 14 June 2026
- July 18, 2026 · score 46 · 9.6 km
- July 11, 2026 · score 22 · 15.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 72 % 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 | 72% |
| Coordinates | 41.5807, -77.9139 |
| Nearest City | Williamsport (85 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T03:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.421a4cece1f36e07a8aa60809f748075a04728cb.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Erie, PA; Allegany, NY; Cattaraugus, NY; Steuben, NY and 3 more areas |
| Headline | Flash Flood Warning issued September 2 at 11:38PM EDT until September 3 at 3:30AM EDT by NWS Cleveland OH |
| Expires | 2026-09-03T03:30:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.421a4cece1f36e07a8aa60809f748075a04728cb.001.1","noaa_urn:oid:2.49.0.1.840.0.77c092015c810e01a43340a2b55dd75971b4be57.001.1","noaa_urn:oid:2.49.0.1.840.0.bcd4213e3662135db456e5511fccb37eb34e1e5e.001.1","noaa_urn:oid:2.49.0.1.840.0.707d1ec229b4b7d228402abed115e09674013cc0.001.1","noaa_urn:oid:2.49.0.1.840.0.ef56cdd120bcd8c805e968dc686010ffbacf6435.001.1","noaa_urn:oid:2.49.0.1.840.0.95564d66dd9292d422cc97796927fe28d77c7a07.001.1"] |
| 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 | 2 S Genesee |
| Iem County | Potter |
| Iem State | PA |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.