⚠️ Severe Thunderstorm Warning – Mercer, IL; Rock Island, IL; Cedar, IA; Henry, IA; Jefferson, IA; Johnson, IA; Keokuk, IA; Louisa, IA; Muscatine, IA; Van Buren, IA; Washington, IA – Sunday, September 20, 2026

Severe Thunderstorm Warning issued September 20 at 1:18AM CDT until September 20 at 2:15AM CDT by NWS Quad Cities IA IL

Details

SVRDVN

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for…
Western Rock Island County in northwestern Illinois…
Northwestern Mercer County in northwestern Illinois…
Northern Henry County in southeastern Iowa…
North central Van Buren County in southeastern Iowa…
Louisa County in southeastern Iowa…
Southeastern Keokuk County in southeastern Iowa…
Southwestern Cedar County in east central Iowa…
Southern Johnson County in east central Iowa…
Washington County in southeastern Iowa…
Muscatine County in east central Iowa…
Jefferson County in southeastern Iowa…

* Until 215 AM CDT.

* At 118 AM CDT, severe thunderstorms were located along a line
extending from Harper to near Coppock to near Hillsboro, moving
northeast at 50 mph.

HAZARD…60 mph wind gusts.

SOURCE…Radar indicated.

IMPACT…Expect damage to roofs, siding, and trees.

* Locations impacted include…
Iowa City, Muscatine, Fairfield, Washington, West Branch, Wapello,
Sigourney, Columbus Junction, West Liberty, Kalona, Wellman, Lone
Tree, Winfield, Riverside, Fruitland, Wayland, Hills, Brighton,
Richland, and Ainsworth.

This includes Interstate 80 in Iowa between mile markers 248 and 265.

Instructions

For your protection move to an interior room on the lowest floor of a
sturdy building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature’s leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.