This alert expired on 4 September 2026 at 05:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 160 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 3 at 8:53PM EDT until September 4 at 1:00AM EDT by NWS Pittsburgh PA
An estimated 633,621 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 18, 2026 · score 48 · 4.0 km
- September 4, 2026 · score 54 · 4.9 km
- March 27, 2026 · score 48 · 4.9 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 54 out of 100, at 92 % 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 | High |
| Calamity Score (ours) | 54 / 100 |
| Our confidence | 92% |
| Coordinates | 40.4337, -79.8737 |
| Nearest City | Wilkinsburg (1 km) |
| Population Exposed | 633.6K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-04T00:53:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8fc9585df992d59ef7850abd35c930abfaaf4d6c.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Fayette, PA; Indiana, PA; Westmoreland, PA; Allegheny, PA; Armstrong, PA; Indiana, PA; Westmoreland, PA; Columbiana, OH; Allegheny, PA; Beaver, PA; Butler, PA; Lawrence, PA and 1 more areas |
| Headline | Flash Flood Warning issued September 3 at 8:53PM EDT until September 4 at 1:00AM EDT by NWS Pittsburgh PA |
| Expires | 2026-09-04T01:00:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8fc9585df992d59ef7850abd35c930abfaaf4d6c.001.1","noaa_urn:oid:2.49.0.1.840.0.c6bfd429088606810e20152565451fbcd77f4121.001.1","noaa_urn:oid:2.49.0.1.840.0.6b5d5a343bdc2c1ec35de834192d45066a63e8f8.001.1","noaa_urn:oid:2.49.0.1.840.0.b330f99eeae7086e10608be547609562764750e8.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | 1 SW Braddock |
| Spc County | Allegheny |
| Spc State | PA |
| Spc Comments | (PBZ) |
| Iem TypeSummary | D |
| Iem City | 1 NNW Wampum |
| Iem County | Lawrence |
| 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 near Wilkinsburg?
Calamity.live data shows a weather event with CalamityScore 54/100, near Wilkinsburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.