* WHAT…Very cold wind chills as low as 30 below expected.
* WHERE…The Mountains of Southwestern Montana south of Interstate
90, Missouri Headwaters, and Madison River Valley.
* WHEN…Until 11 AM MST Tuesday.
* IMPACTS…The dangerously cold wind chills as low as 30 below zero
could cause frostbite on exposed skin in as little as 10 minutes.