⚠️ Severe Thunderstorm Warning – Jasper, IA; Mahaska, IA; Marion, IA; Polk, IA; Poweshiek, IA; Warren, IA – Tuesday, September 8, 2026

Severe Thunderstorm Warning issued September 8 at 6:21PM CDT until September 8 at 7:00PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

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

* Until 700 PM CDT.

* At 621 PM CDT, severe thunderstorms were located along a line
extending from 4 miles northwest of Lambs Grove to near Spring
Hill, moving east at 40 mph.

HAZARD…70 mph wind gusts and quarter size hail.

SOURCE…Public.

IMPACT…Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.

* Locations impacted include…
Des Moines, West Des Moines, Ankeny, Johnston, Newton, Indianola,
Altoona, Pella, Grinnell, Norwalk, Pleasant Hill, Knoxville,
Carlisle, Bondurant, Saylorville, Mitchellville, Colfax, Monroe,
Pleasantville, and Prairie City.

This includes the following highways…
Interstate 35 between mile markers 87 and 101.
Interstate 80 between mile markers 132 and 183.
Interstate 235 between mile markers 5 and 14.

Instructions

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

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