* WHAT...Very cold wind chills as low as 29 below.
* WHERE...Portions of southwest and west central Iowa and east central, northeast, and southeast Nebraska.
* WHEN...Until noon CST Tuesday.
* IMPACTS...The dangerously cold wind chills as low as 30 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values this cold can lead to hypothermia with prolonged exposure.