* WHAT...Very cold wind chills as low as 15 to 20 below zero.

* WHERE...All of southeast Michigan.

* WHEN...Until noon EST Wednesday.

* IMPACTS...The dangerously cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* ADDITIONAL DETAILS...Wind chills recover some during the day Tuesday but still between negative 5 to negative 15. Coldest temperatures occur late night into the early morning period.