This alert expired on 12 August 2026 at 13:45 UTC. It is kept here as a record.
It is the 4th strongest of the 35 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 20 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 7:44AM CDT until August 12 at 8:45AM CDT by NWS Lincoln IL
An estimated 119,271 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 11, 2026 · score 32 · 9.2 km
- March 10, 2026 · score 39 · 10.9 km
- July 8, 2026 · score 43 · 11.3 km
How we know
Confirmed by 7 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 41.1047, -90.8178 |
| Nearest City | Muscatine (40 km) |
| Population Exposed | 119.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T12:44:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Knox, IL; Henderson, IL; Des Moines, IA; Henry, IA; Lee, IA; Schuyler, MO and 2 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 7:44AM CDT until August 12 at 8:45AM CDT by NWS Lincoln IL |
| Expires | 2026-08-12T08:45:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.29863742c1a8b58a89b203d28746e2360acb7f01.001.1","noaa_urn:oid:2.49.0.1.840.0.9096798c0a05e460997347fac8d51091861ce6a4.001.1","noaa_urn:oid:2.49.0.1.840.0.beb8f8721608dd4adbde3b83ddceaabc31357607.001.1","noaa_urn:oid:2.49.0.1.840.0.ea934565e8381b259040f14c8c4dadf1b4c08f4e.001.1","noaa_urn:oid:2.49.0.1.840.0.470f806e0381762a359025fbd1e2d1356e705315.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 N Riverdale |
| Iem County | Scott |
| Iem State | IA |
| Iem Wfo | DVN |
| Iem Remark | 2-3 foot trees snapped. |
| MergedSources | [{"id":"iem_G_40.830_-91.270_1786538340000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538340000,"latitude":40.83,"longitude":-91.27},{"id":"iem_D_41.520_-90.540_1786538460000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538460000,"latitude":41.52,"longitude":-90.54},{"id":"iem_H_40.930_-91.410_1786537740000","source":"iem","severity":"low","severityValue":25,"timestamp":1786537740000,"latitude":40.93,"longitude":-91.41},{"id":"iem_D_41.500_-90.570_1786536720000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536720000,"latitude":41.5,"longitude":-90.57},{"id":"iem_G_40.930_-91.430_1786537380000","source":"iem","severity":"low","severityValue":25,"timestamp":1786537380000,"latitude":40.93,"longitude":-91.43},{"id":"iem_D_41.540_-90.470_1786538040000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538040000,"latitude":41.54,"longitude":-90.47}] |
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 43/100, near Muscatine (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.