Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 2 August 2026 at 21:50 UTC. It is kept here as a record.
It is the 15th strongest of the 37 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 28 July 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 2 at 5:40PM EDT until August 2 at 5:45PM EDT by NWS Pittsburgh PA
Urban PEI: 45,344 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 5, 2026 · score 39 · 2.7 km
- July 28, 2026 · score 39 · 5.3 km
- July 19, 2026 · score 63 · 16.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 | Medium |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 40.6859, -78.4412 |
| Nearest City | Altoona (19 km) |
| Urban exposure index (PEI) | 45.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-02T21:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.3fae7e81c2b1d19502a21efa1966d480 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-08-02T21:40:00.000Z.
First archived: 2026-08-02T21:42:49.140Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Allegheny, PA; Butler, PA; Fayette, PA; Greene, PA; Marion, WV; Monongalia, WV; Clay, WV; Kanawha, WV; Roane, WV and 5 more areas |
| Headline | Flash Flood Warning issued August 2 at 5:40PM EDT until August 2 at 5:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-08-02T17:50:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3fae7e81c2b1d19502a21efa1966d4800cb30239.001.1","noaa_urn:oid:2.49.0.1.840.0.c6e9213e86fadc864beccda0c92238e37a83f1b5.001.1","noaa_urn:oid:2.49.0.1.840.0.2fa4cc4ece61b9e74c659d9735a56ce3ffe35215.001.1","noaa_urn:oid:2.49.0.1.840.0.91398bb682758247c8e5e19e9e1eed34e0bdc0ce.001.1","noaa_urn:oid:2.49.0.1.840.0.f75d6f7ca6c0777bfb1d5126d12537d50a7645e4.001.1","noaa_urn:oid:2.49.0.1.840.0.f99ebb6130ba340c8ebad48644a6cfb7989d43cf.001.1","noaa_urn:oid:2.49.0.1.840.0.08b38e9dd67110d574041a828aac76107c4e78ff.001.1","noaa_urn:oid:2.49.0.1.840.0.24588da49bc62840192e3b07c2c0a6ec5baf32bc.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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