This alert expired on 3 September 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 46 recorded within 20 km of this point since 17 March 2026 — 9 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 6:34PM EDT until September 3 at 6:45PM EDT by NWS Cleveland OH
An estimated 645,858 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 10, 2026 · score 48 · 2.7 km
- September 3, 2026 · score 54 · 6.6 km
- August 9, 2026 · score 48 · 9.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 54 out of 100, at 91 % 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 | 91% |
| Coordinates | 40.8376, -81.1900 |
| Nearest City | Alliance (11 km) |
| Population Exposed | 645.9K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T22:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.5b66cb8550f07d341a09f06159474b716711b0c4.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lorain, OH; Hardin, OH; Allegheny, PA; Beaver, PA and 9 more areas |
| Headline | Severe Thunderstorm Warning issued September 3 at 6:34PM EDT until September 3 at 6:45PM EDT by NWS Cleveland OH |
| Expires | 2026-09-03T18:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5b66cb8550f07d341a09f06159474b716711b0c4.002.1","noaa_urn:oid:2.49.0.1.840.0.1f1acc6007b013aa878e6fa8d67c9240ae80d41e.001.1","noaa_urn:oid:2.49.0.1.840.0.d21dd121ab6079ff07527b6ce40a0b2a21299055.002.1","noaa_urn:oid:2.49.0.1.840.0.9898d8247c9521d199c95cfd52afca43051afe4b.002.1","noaa_urn:oid:2.49.0.1.840.0.24a54e8c768b8dacc7133ddb60f3e3f72ddba165.001.1","noaa_urn:oid:2.49.0.1.840.0.76a911b3fd1a6d7abe8ce648164a8f600e428a2d.001.1","noaa_urn:oid:2.49.0.1.840.0.1a923686c0a02b4bdf7af428ceb9e38d758c1b5c.001.1","noaa_urn:oid:2.49.0.1.840.0.cf62b4e30ec11bd30e4e3a74388e433c019b99db.001.1","noaa_urn:oid:2.49.0.1.840.0.db5dc535a0a43ef75f63ab1f6b1628bf4d5b0113.001.1","noaa_urn:oid:2.49.0.1.840.0.d3c6e9c635dabb9a7280e4d753c9c48b586e8a2f.001.1","noaa_urn:oid:2.49.0.1.840.0.ae3ff1b2bf06b14834f39f75883f7e0fa38ca9e7.001.1","noaa_urn:oid:2.49.0.1.840.0.3fd3119489bd688d829f3fc7a1fe91b479b1d2ec.002.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 2 W Mogadore |
| Spc County | Summit |
| Spc State | OH |
| Spc Comments | (CLE) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | 1 N Lakemore |
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.
Want to know when something happens near Alliance?
Calamity.live data shows a weather event with CalamityScore 54/100, near Alliance (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.