Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 4 July 2026 at 00:52 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 8:42PM EDT until July 3 at 8:45PM EDT by NWS Pittsburgh PA
Urban PEI: 249,035 within a heuristic 50 km radius; not unique people.
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.1221, -80.7015 |
| Nearest City | Youngstown (5 km) |
| Urban exposure index (PEI) | 249.0K within 50 km |
| Impact Tier | significant |
| Date | 2026-07-04 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.042f572f17b748753884a322ce63da45 |
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: 2026-07-04 — time not reported.
First archived: 2026-07-04T00:43:26.075Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Armstrong, PA; Butler, PA; Clarion, PA; Venango, PA; Armstrong, PA; Butler, PA; Clarion, PA; Indiana, PA; Jefferson, PA; Clarion, PA; Forest, PA; Venango, PA and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 3 at 8:42PM EDT until July 3 at 8:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-03T20:52:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.042f572f17b748753884a322ce63da45bf63ee21.001.1","noaa_urn:oid:2.49.0.1.840.0.08b83ebd5fd3dd5d8fa8b9150c3f26ae123be039.001.1","noaa_urn:oid:2.49.0.1.840.0.6d183ec7eca95a10e5d56d3d1fc867bb9c104b62.001.1","noaa_urn:oid:2.49.0.1.840.0.23bc24d5a5660cd566bfdbca6747a69c85461f87.001.1","noaa_urn:oid:2.49.0.1.840.0.6c0bcd1e24be34b5d2c85abbf3d92cc1b2dcd7e6.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 NNW Grove City |
| Iem County | Mercer |
| Iem State | PA |
| Iem Wfo | PBZ |
| Iem Remark | BETWEEN GEORGE JR RD TO THE RAILROAD TRACKS (CROSSING CRANBERRY RD) THERE ARE WIRES DOWN AND TREES ALL ALONG THE ROAD. Time based on radar estimate. |
| MergedSources | [{"id":"iem_L_41.170_-80.170_1783121220000","source":"iem","severity":"low","severityValue":25,"timestamp":1783121220000,"latitude":41.17,"longitude":-80.17},{"id":"iem_D_41.240_-80.490_1783120620000","source":"iem","severity":"low","severityValue":25,"timestamp":1783120620000,"latitude":41.24,"longitude":-80.49},{"id":"iem_D_41.190_-80.100_1783121820000","source":"iem","severity":"low","severityValue":25,"timestamp":1783121820000,"latitude":41.19,"longitude":-80.1},{"id":"iem_D_41.190_-80.110_1783121820000","source":"iem","severity":"low","severityValue":25,"timestamp":1783121820000,"latitude":41.19,"longitude":-80.11}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens near Youngstown?