Seriously, if someone isn’t keeping an eye or ear to the forecast, this is a good way to end up stiff, and then some.
Sounds like I-90 is closed in South Dakota. Started in the far west, but now extended to Sioux Falls. Rescues underway.
.SHORT TERM...(Today - Friday) Issued at 420 AM MST Thu Dec 22 2022 A very cold morning indeed across all of southeast Wyoming and the western Nebraska Panhandle, with the vast majority of areas seeing current temperatures around -20 deg F with a few sites approaching -30 F across portions of Converse County in southeast Wyoming. The low temperature so far at the Cheyenne Airport has been a chilling -23 deg F, with potential for additional cooling as sunrise slowly approaches. This is not a daily record low, but does have at least some significance as the all-time record for temperature drops for KCYS is 64 degrees over 19 hours, set in 1950. Cheyenne saw a high of 42 degrees shortly after 100 PM on Wednesday, and has fallen 65 degrees in an incredible 15 hours. It appears we have a new record for all durations of temperature drops! Otherwise, dangerously low wind chills persist with a steady breeze of 15-30 MPH helping push wind chills into the -50 to -65 range for much of the CWA. Did not make any changes to Wind Chill Warnings as daytime highs will most likely remain well below zero, especially considering the addition of fresh snow from the snow squalls on Wednesday. Winds will get a bit stronger as well this afternoon, which should hold wind chills to minus 30 or colder. Just one more night of this before we start to see some moderation!
Emphasis mine.