⚠️ Severe Thunderstorm Warning – Jasper, IA; Marion, IA; Polk, IA; Warren, IA – Monday, July 20, 2026

Severe Thunderstorm Warning issued July 20 at 7:45PM CDT until July 20 at 8:30PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Southeastern Polk County in central Iowa…
Marion County in south central Iowa…
Southern Jasper County in central Iowa…
Northeastern Warren County in south central Iowa…

* Until 830 PM CDT.

* At 744 PM CDT, severe thunderstorms were located along a line
extending from near Lambs Grove to 4 miles southeast of Prairie
City to Sandyville, moving southeast at 30 mph.

HAZARD…60 mph wind gusts and quarter size hail.

SOURCE…Public report of 61 mph wind gust 3 miles northwest of
Mitchellville.

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

* Locations impacted include…
Newton, Pella, Knoxville, Carlisle, Mitchellville, Colfax, Monroe,
Pleasantville, Prairie City, Melcher-Dallas, Iowa Speedway,
Knoxville Raceway, Lake Red Rock, Sully, Hartford, Runnells,
Harvey, Lambs Grove, Reasnor, and Swan.

This includes Interstate 80 between mile markers 148 and 174.

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 central and
south central Iowa.

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