⚠️ Tornado Warning – Lyon, IA; O’Brien, IA; Osceola, IA; Sioux, IA – Tuesday, September 1, 2026

Tornado Warning issued September 1 at 10:04PM CDT until September 1 at 10:30PM CDT by NWS Sioux Falls SD

Details

TORFSD

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for…
Southeastern Lyon County in northwestern Iowa…
Southwestern Osceola County in northwestern Iowa…
Northeastern Sioux County in northwestern Iowa…
Northwestern O’Brien County in northwestern Iowa…

* Until 1030 PM CDT.

* At 1003 PM CDT, a severe thunderstorm capable of producing a
tornado was located over Hull, or 9 miles northeast of Sioux
Center, moving northeast at 45 mph.

HAZARD…Tornado and quarter size hail.

SOURCE…Radar indicated rotation.

IMPACT…Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.

* This dangerous storm will be near…
Boyden and Matlock around 1010 PM CDT.
Ashton around 1015 PM CDT.

Instructions

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

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