This alert expired on 10 August 2026 at 02:15 UTC. It is kept here as a record.
No stronger detection stands among the 39 recorded within 20 km of this point since 12 March 2026 — 17 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 9 at 10:05PM EDT until August 9 at 10:15PM EDT by NWS Cleveland OH
An estimated 120,252 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 11, 2026 · score 43 · 9.3 km
- March 16, 2026 · score 43 · 14.3 km
- August 8, 2026 · score 43 · 14.5 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 85% |
| Coordinates | 40.7088, -82.7673 |
| Nearest City | Mansfield (22 km) |
| Population Exposed | 120.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T02:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0898dee788a52d6537383abb2ea7d535 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Erie, OH; Huron, OH; Delaware, OH; Franklin, OH; Madison, OH; Union, OH |
| Headline | Severe Thunderstorm Warning issued August 9 at 10:05PM EDT until August 9 at 10:15PM EDT by NWS Cleveland OH |
| Expires | 2026-08-09T22:15:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0898dee788a52d6537383abb2ea7d535bc5fb2af.001.1","noaa_urn:oid:2.49.0.1.840.0.e5f8261dad4b48b4a1c74a65c7735d4785fad5c8.001.1"] |
| Iem TypeSummary | D |
| Iem City | 3 WNW Monroeville |
| Iem County | Huron |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Reports of poles and trees down across various portions of northern Huron County. Time estimated via radar. |
| MergedSources | [{"id":"iem_D_41.260_-82.760_1786325400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786325400000,"latitude":41.26,"longitude":-82.76}] |
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 10 February 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 Mansfield?
Calamity.live data shows a weather event with CalamityScore 43/100, near Mansfield (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.