This alert expired on 11 August 2026 at 05:45 UTC. It is kept here as a record.
No stronger detection stands among the 91 recorded within 20 km of this point since 11 March 2026 — 30 others scored the same. The last comparable one was on 10 August 2026. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 1:00AM EDT until August 11 at 1:45AM EDT by NWS Cleveland OH
An estimated 1,952,938 people live within 50 km of this point.
Nearby, since 11 March 2026
- August 10, 2026 · score 52 · 5.0 km
- May 9, 2026 · score 52 · 5.8 km
- August 10, 2026 · score 52 · 7.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 85% |
| Coordinates | 41.3925, -81.7912 |
| Nearest City | Brook Park (1 km) |
| Population Exposed | 2.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T05:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6d4d6c86eddb4ac5eb3a098de0129cf61ec6744a.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cuyahoga, OH; Lorain, OH; Medina, OH; Portage, OH; Summit, OH |
| Headline | Severe Thunderstorm Warning issued August 11 at 1:00AM EDT until August 11 at 1:45AM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T01:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | Savannah |
| Iem County | Ashland |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Widespread power outages in Northern Ashland County with trees and power lines down along S Main St in Savannah. Damage seems to be isolated to the US 250 corridor. |
| MergedSources | [{"id":"iem_D_40.970_-82.360_1786422420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786422420000,"latitude":40.97,"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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Brook Park (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.