This alert is in force until 3 September 2026, 16:15 UTC.
It is the 13th strongest of the 69 detections recorded within 20 km of this point since 3 April 2026. The last comparable one was on 2 September 2026.
What the source measured
HEAT GOV reported: * WHAT...Heat index values of 100 to 105 expected. This is the third day in a row with forecast or observed heat indices above 100 degrees. * WHERE...Boone, DuPage, Kane, and McHenry Counties. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat i...
An estimated 2,438,565 people live within 50 km of this point.
Nearby, since 3 April 2026
- June 25, 2026 · score 52 · 5.4 km
- July 4, 2026 · score 52 · 6.3 km
- September 2, 2026 · score 46 · 10.1 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Our confidence | 69% |
| Coordinates | 42.1070, -88.4121 |
| Nearest City | Huntley (7 km) |
| Population Exposed | 2.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T06:08:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-03T01:08:00-05:00 |
| Expires | 2026-09-03T11:15:00-05:00 |
| AreaDesc | Boone; McHenry; Kane; DuPage |
| SenderName | NWS Chicago IL |
| ZonesUsedForCentroid | 4 |
| ZoneCount | 4 |
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 Huntley?
Calamity.live data shows a weather event with CalamityScore 46/100, near Huntley (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.