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

Severe Thunderstorm Warning issued July 20 at 7:11PM CDT until July 20 at 8:00PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Polk County in central Iowa…
Northwestern Marion County in south central Iowa…
Western Jasper County in central Iowa…
Northern Warren County in south central Iowa…

* Until 800 PM CDT.

* At 711 PM CDT, a severe thunderstorm was located over Prairie
Meadows, or over Altoona, 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…
Des Moines, West Des Moines, Ankeny, Urbandale, Johnston, Clive,
Newton, Altoona, Norwalk, Pleasant Hill, Grimes, Windsor Heights,
Carlisle, Bondurant, Saylorville, Mitchellville, Colfax, Monroe,
Prairie City, and Granger.

This includes the following highways…
Interstate 35 between mile markers 61 and 72, and between mile
markers 87 and 92.
Interstate 80 between mile markers 122 and 164.
Interstate 235 between mile markers 1 and 14.

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.