This alert expired on 11 August 2026 at 11:07 UTC. It is kept here as a record.
It is the 2nd strongest of the 34 detections recorded within 20 km of this point since 12 March 2026. 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 11 at 6:57AM EDT until August 11 at 7:00AM EDT by NWS Cleveland OH
An estimated 154,321 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 18, 2026 · score 37 · 5.3 km
- July 18, 2026 · score 43 · 8.0 km
- March 12, 2026 · score 43 · 14.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 92 % 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 | 92% |
| Coordinates | 40.9825, -82.8935 |
| Nearest City | Tiffin (28 km) |
| Population Exposed | 154.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T10:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8d948fcd709e162e0ffaa1b99f16ee40 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Huron, OH; Seneca, OH; Crawford, OH; Wyandot, OH |
| Headline | Severe Thunderstorm Warning issued August 11 at 6:57AM EDT until August 11 at 7:00AM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T07:07:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8d948fcd709e162e0ffaa1b99f16ee40ebcc9c43.001.1","noaa_urn:oid:2.49.0.1.840.0.0f8fa85a41a92f53c8925bb0618e6aa1a6ec98f3.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 49 |
| Iem Unit | MPH |
| Iem City | 3 WNW Vermilion |
| Iem County | LEZ145 |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | C-Man station VRMO1 2 WNW Vermilion gust to 43 knots. |
| MergedSources | [{"id":"iem_M_41.430_-82.360_1786424580000","source":"iem","severity":"low","severityValue":25,"timestamp":1786424580000,"latitude":41.43,"longitude":-82.36},{"id":"iem_M_41.430_-82.360_1786425000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786425000000,"latitude":41.43,"longitude":-82.36}] |
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 Tiffin?
Calamity.live data shows a weather event with CalamityScore 43/100, near Tiffin (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.