Right now
The most recent data we hold from NOAA arrived 6 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 29 June 2026 at 00:15 UTC. It is kept here as a record.
It is the 31st strongest of the 239 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 28 at 5:45PM EDT until June 28 at 8:15PM EDT by NWS Pittsburgh PA
Urban PEI: 633,621 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 29, 2026 · score 48 · 0.0 km
- June 28, 2026 · score 48 · 0.0 km
- July 10, 2026 · score 48 · 2.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 40.3925, -79.7462 |
| Nearest City | Monroeville (5 km) |
| Urban exposure index (PEI) | 633.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T21:45:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.97b209099e9175be4676eb4660d68dfada36a324.001.1 |
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: 2026-06-28T21:45:00.000Z.
First archived: 2026-06-28T22:21:17.482Z. 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; Westmoreland, PA |
| Headline | Flash Flood Warning issued June 28 at 5:45PM EDT until June 28 at 8:15PM EDT by NWS Pittsburgh PA |
| Expires | 2026-06-28T20:15:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 1 NE Churchill |
| Iem County | Allegheny |
| Iem State | PA |
| Iem Wfo | PBZ |
| Iem Remark | Water over Rodi Road. |
| MergedSources | [{"id":"iem_F_40.430_-79.800_1782683100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782683100000,"latitude":40.43,"longitude":-79.8},{"id":"iem_F_40.450_-79.830_1782683400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782683400000,"latitude":40.45,"longitude":-79.83}] |
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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