This alert is in force until 3 September 2026, 13:00 UTC.
It is the 17th strongest of the 43 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 11 August 2026.
What the source measured
HEAT GOV reported: * WHAT...Heat index values up to 100 expected. * WHERE...Portions of north central, northeast, and northwest Ohio. * WHEN...From 2 PM this afternoon to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
An estimated 134,004 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 18, 2026 · score 37 · 3.1 km
- July 18, 2026 · score 43 · 4.4 km
- August 11, 2026 · score 43 · 7.7 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 69 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 69% |
| Coordinates | 40.9527, -82.9767 |
| Nearest City | Tiffin (24 km) |
| Population Exposed | 134.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T18:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-03T14:00:00-04:00 |
| Expires | 2026-09-03T09:00:00-04:00 |
| AreaDesc | Lucas; Wood; Ottawa; Sandusky; Hancock; Seneca; Huron; Wyandot; Crawford; Richland; Ashland; Wayne; Marion; Morrow; Holmes; Knox |
| SenderName | NWS Cleveland OH |
| ZonesUsedForCentroid | 4 |
| ZoneCount | 16 |
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 Tiffin?
Calamity.live data shows a weather event with CalamityScore 37/100, near Tiffin (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.