This alert is in force until 2 September 2026, 11:00 UTC.
It is the 7th strongest of the 36 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 19 August 2026.
What the source measured
HEAT GOV reported: * WHAT...Heat index values up to 105. * WHERE...Portions of northwest and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Thunderst...
An estimated 49,378 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 13, 2026 · score 34 · 14.6 km
- August 16, 2026 · score 43 · 17.2 km
- June 11, 2026 · score 37 · 20.8 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 69 % 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) | 28 / 100 |
| Our confidence | 69% |
| Coordinates | 41.1544, -91.3735 |
| Nearest City | Muscatine (41 km) |
| Population Exposed | 49.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T02:47:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-01T21:47:00-05:00 |
| Expires | 2026-09-02T06:00:00-05:00 |
| AreaDesc | Iowa; Johnson; Cedar; Clinton; Muscatine; Scott; Keokuk; Washington; Louisa; Jefferson; Henry; Des Moines; Van Buren; Lee; Carroll; Whiteside; Rock Island; Henry; Mercer; Henderson; Warren; Hancock; McDonough; Scotland; Clark |
| SenderName | NWS Quad Cities IA IL |
| ZonesUsedForCentroid | 9 |
| ZoneCount | 25 |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.