This alert expired on 12 August 2026 at 14:15 UTC. It is kept here as a record.
It is the 5th strongest of the 47 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 8:09AM CDT until August 12 at 9:15AM CDT by NWS Chicago IL
An estimated 272,011 people live within 50 km of this point.
Nearby, since 10 March 2026
- July 8, 2026 · score 43 · 13.0 km
- March 11, 2026 · score 49 · 14.0 km
- March 11, 2026 · score 49 · 16.8 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 41.1536, -90.4398 |
| Nearest City | Galesburg (23 km) |
| Population Exposed | 272.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T13:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f1568a59502b6ad8fdab81f27a187bdc |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lee, IL; Ogle, IL; Henderson, IL; Des Moines, IA; Lee, IA; Bureau, IL; Henry, IL; Whiteside, IL and 3 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 8:09AM CDT until August 12 at 9:15AM CDT by NWS Chicago IL |
| Expires | 2026-08-12T09:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f1568a59502b6ad8fdab81f27a187bdc43916226.001.1","noaa_urn:oid:2.49.0.1.840.0.023d97a629ba2c9966f02cc0caad543ec4581885.002.1","noaa_urn:oid:2.49.0.1.840.0.c0ed1625ccf5197d5fadcd26300dca6b399dd694.001.1","noaa_urn:oid:2.49.0.1.840.0.4f20abd7dc8be6ffaffe850acb6ce2f2242893aa.001.1","noaa_urn:oid:2.49.0.1.840.0.a1002587d2dc0c412de5e1a8425b3b43f0ac6b61.001.1","noaa_urn:oid:2.49.0.1.840.0.29863742c1a8b58a89b203d28746e2360acb7f01.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 N Davenport |
| Iem County | Scott |
| Iem State | IA |
| Iem Wfo | DVN |
| Iem Remark | 1-2 inch branches down, very heavy rain and heavy winds. |
| MergedSources | [{"id":"iem_D_41.520_-90.540_1786538460000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538460000,"latitude":41.52,"longitude":-90.54},{"id":"iem_D_41.500_-90.570_1786536720000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536720000,"latitude":41.5,"longitude":-90.57},{"id":"iem_D_41.540_-90.470_1786538040000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538040000,"latitude":41.54,"longitude":-90.47},{"id":"iem_D_41.580_-90.610_1786536540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536540000,"latitude":41.58,"longitude":-90.61}] |
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 Galesburg?
Calamity.live data shows a weather event with CalamityScore 43/100, near Galesburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.