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

Severe Thunderstorm Warning issued September 8 at 6:55PM CDT until September 8 at 7:45PM 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…
Southern Poweshiek County in central Iowa…
Southeastern Polk County in central Iowa…
Marion County in south central Iowa…
Northwestern Mahaska County in south central Iowa…
Jasper County in central Iowa…
Eastern Warren County in south central Iowa…

* Until 745 PM CDT.

* At 654 PM CDT, severe thunderstorms were located along a line
extending from Grinnell Regional Airport to near Milo, moving east
at 35 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…
Newton, Indianola, Pella, Grinnell, Knoxville, Montezuma, Carlisle,
Colfax, Monroe, Pleasantville, Prairie City, New Sharon,
Melcher-Dallas, Iowa Speedway, Knoxville Raceway, Lake Red Rock,
Rock Creek Lake, Sully, Milo, and Hartford.

This includes Interstate 80 between mile markers 153 and 203.

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.