A Winter Weather Advisory for freezing fog and drizzle posted has been for southeast Wyoming, including Cheyenne and the summit on Interstate 80 between Cheyenne and Laramie.
We will begin to see a prolonged period of moderate to heavy snowfall for the Snowy and Sierra Madres Ranges where 1 to 2 feet of snow accumulation will be possible.
The wind chill in Cheyenne has only dropped below -50 three times since 1947. But it's expected to hit -51 early Thursday and could well plunge below that mark.