Right now
The most recent data we hold from NOAA arrived 21 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 4 July 2026 at 01:45 UTC. It is kept here as a record.
It is the 11th strongest of the 146 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 9:05PM EDT until July 3 at 9:45PM EDT by NWS Cleveland OH
Urban PEI: 249,035 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 4, 2026 · score 43 · 8.1 km
- September 13, 2026 · score 37 · 8.2 km
- July 5, 2026 · score 67 · 8.4 km
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 | 0.91/1 |
| Coordinates | 41.0789, -80.6639 |
| Nearest City | Youngstown (3 km) |
| Urban exposure index (PEI) | 249.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T01:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b25394f35d7d7faefe627f044eb31363 |
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: 2026-07-04T01:05:00.000Z.
First archived: 2026-07-04T01:09:57.015Z. 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 | Geauga, OH; Mahoning, OH; Medina, OH; Portage, OH; Stark, OH; Summit, OH; Trumbull, OH; Wayne, OH; Jefferson, PA; Ashtabula, OH; Geauga, OH; Lake, OH; Trumbull, OH and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 3 at 9:05PM EDT until July 3 at 9:45PM EDT by NWS Cleveland OH |
| Expires | 2026-07-03T21:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b25394f35d7d7faefe627f044eb313633aa63a5c.001.1","noaa_urn:oid:2.49.0.1.840.0.a1472cddb0af1a382237234138cf44809b75251c.001.1","noaa_urn:oid:2.49.0.1.840.0.eb583abd93e4a652eaf5d87a5f22927eb0e528c8.001.1","noaa_urn:oid:2.49.0.1.840.0.b4fb03f8c27c9c088f28d6693d81c711e1e7b462.002.1","noaa_urn:oid:2.49.0.1.840.0.7653c1e3dbe2e1707979fa87f0038bd5c06d60e4.001.1"] |
| 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.
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