This alert expired on 10 August 2026 at 15:15 UTC. It is kept here as a record.
It is the 6th strongest of the 40 detections recorded within 20 km of this point since 17 March 2026. 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
- August 9, 2026 · score 48 · 8.2 km
- September 3, 2026 · score 54 · 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.