This alert expired on 10 August 2026 at 15:15 UTC. It is kept here as a record.
No stronger detection stands among the 34 recorded within 20 km of this point since 17 March 2026 — 10 others scored the same. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 10 at 10:43AM EDT until August 10 at 11:15AM EDT by NWS Wilmington OH
An estimated 632,342 people live within 50 km of this point.
Nearby, since 17 March 2026
- September 3, 2026 · score 41 · 5.7 km
- August 9, 2026 · score 48 · 8.2 km
- August 10, 2026 · score 48 · 8.5 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 48 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 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 |
| Our confidence | 91% |
| Coordinates | 40.8258, -81.2176 |
| Nearest City | Alliance (14 km) |
| Population Exposed | 632.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T14:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.cbbd9305731bd21d905842862e9a4c51 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Delaware, OH; Franklin, OH; Licking, OH; Carroll, OH; Harrison, OH; Tuscarawas, OH; Carroll, OH; Columbiana, OH and 6 more areas |
| Headline | Severe Thunderstorm Warning issued August 10 at 10:43AM EDT until August 10 at 11:15AM EDT by NWS Wilmington OH |
| Expires | 2026-08-10T11:15:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cbbd9305731bd21d905842862e9a4c51200cb1a1.001.1","noaa_urn:oid:2.49.0.1.840.0.e7926e8dc043bf4517a937439998efb8838a3b31.001.1","noaa_urn:oid:2.49.0.1.840.0.8ff4682cb8dfea0630d0f55f9109d83771efec6d.001.1","noaa_urn:oid:2.49.0.1.840.0.5842d22a6d036abe3a40fec20205afd38df64fbb.001.1","noaa_urn:oid:2.49.0.1.840.0.906cac014f453d6b2e59c38852f36c8c44ed38c4.001.1","noaa_urn:oid:2.49.0.1.840.0.aa427e8adc23b02380665957b6125cbc6de8486f.002.1","noaa_urn:oid:2.49.0.1.840.0.be9f65485e761f4677a50e51b39671fd93cb7d5a.001.1","noaa_urn:oid:2.49.0.1.840.0.488db274b2d1b869150124fe0920e91115358a76.001.1","noaa_urn:oid:2.49.0.1.840.0.502e12e2fe8227a7b20893ccff1a74a577918be5.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | Copley |
| Iem County | Summit |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Estimated 60 mph wind gust. |
| MergedSources | [{"id":"iem_H_41.110_-81.580_1786367520000","source":"iem","severity":"low","severityValue":25,"timestamp":1786367520000,"latitude":41.11,"longitude":-81.58},{"id":"iem_H_41.110_-81.580_1786367460000","source":"iem","severity":"low","severityValue":25,"timestamp":1786367460000,"latitude":41.11,"longitude":-81.58},{"id":"iem_H_40.910_-81.100_1786369800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786369800000,"latitude":40.91,"longitude":-81.1},{"id":"iem_D_41.310_-81.660_1786365900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786365900000,"latitude":41.31,"longitude":-81.66},{"id":"iem_H_41.190_-81.720_1786366920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786366920000,"latitude":41.19,"longitude":-81.72},{"id":"iem_H_41.120_-81.720_1786367400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786367400000,"latitude":41.12,"longitude":-81.72},{"id":"iem_H_41.100_-81.640_1786367100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786367100000,"latitude":41.1,"longitude":-81.64}] |
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 48/100, near Alliance (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.