⚠️ Severe Thunderstorm Warning – Lucas, IA; Mahaska, IA; Marion, IA; Monroe, IA – Monday, July 20, 2026

Severe Thunderstorm Warning issued July 20 at 8:21PM CDT until July 20 at 9:00PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Northeastern Lucas County in south central Iowa…
Northwestern Monroe County in south central Iowa…
Southeastern Marion County in south central Iowa…
Southwestern Mahaska County in south central Iowa…

* Until 900 PM CDT.

* At 821 PM CDT, severe thunderstorms were located along a line
extending from Pella Municipal Airport to 4 miles south of
Knoxville Municipal Airport to near Williamson, moving southeast at
30 mph.

HAZARD…60 mph wind gusts and quarter size hail.

SOURCE…Radar indicated.

IMPACT…Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.

* Locations impacted include…
Pella, Knoxville, Albia, Melcher-Dallas, Knoxville Raceway, Lake
Red Rock, Lovilia, Beacon, Bussey, Harvey, Hamilton, Melrose,
Marysville, Pella Municipal Airport, and Knoxville Municipal
Airport.

Instructions

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

A Tornado Watch remains in effect until 1000 PM CDT for south central
Iowa.

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