This alert expired on 12 August 2026 at 16:15 UTC. It is kept here as a record.
It is the 5th strongest of the 54 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 20 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 12 at 7:35AM CDT until August 12 at 11:15AM CDT by NWS Quad Cities IA IL
An estimated 172,057 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 9, 2026 · score 43 · 3.4 km
- August 15, 2026 · score 37 · 11.3 km
- July 11, 2026 · score 43 · 14.6 km
How we know
Confirmed by 10 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 | 41.6947, -91.2065 |
| Nearest City | Iowa City (27 km) |
| Population Exposed | 172.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T12:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.b6bebec96bf6d3bc95ef3fd867c21b2d |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Benton, IA; Iowa, IA; Johnson, IA; Linn, IA; Scott, IA; Rock Island, IL |
| Headline | Flash Flood Warning issued August 12 at 7:35AM CDT until August 12 at 11:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-08-12T11:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b6bebec96bf6d3bc95ef3fd867c21b2dd8e2d83b.001.1","noaa_urn:oid:2.49.0.1.840.0.517826677f2472c0d6f67a3b638cf90f5d125d12.001.1"] |
| 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_G_41.620_-90.580_1786536240000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536240000,"latitude":41.62,"longitude":-90.58},{"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_41.830_-91.870_1786531980000","source":"iem","severity":"low","severityValue":25,"timestamp":1786531980000,"latitude":41.83,"longitude":-91.87},{"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_41.730_-91.890_1786535880000","source":"iem","severity":"low","severityValue":25,"timestamp":1786535880000,"latitude":41.73,"longitude":-91.89},{"id":"iem_D_41.540_-90.470_1786538040000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538040000,"latitude":41.54,"longitude":-90.47},{"id":"iem_H_41.830_-91.870_1786530600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786530600000,"latitude":41.83,"longitude":-91.87},{"id":"iem_G_41.580_-91.180_1786533180000","source":"iem","severity":"low","severityValue":25,"timestamp":1786533180000,"latitude":41.58,"longitude":-91.18},{"id":"iem_D_41.580_-90.610_1786536540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536540000,"latitude":41.58,"longitude":-90.61}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 near Iowa City?
Calamity.live data shows a weather event with CalamityScore 43/100, near Iowa City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.