Wind chill values will drop to -30 to -50 degrees across the Black Hills region Monday night through Tuesday morning, prompting a Wind Chill Warning in effect until Noon MST Tuesday. Cold Arctic air has pushed into the region, with temperatures falling through the day Monday, while winds were 20 to 30 mph and gusts reached 40 mph.
Air temperatures will drop to -10 to -30 degrees Monday night with 10 to 20 mph winds and 30 mph gusts producing the frigid wind chill readings. "At 40 below zero wind chill values, a person can get frostbite on exposed skin in less than 10 minutes, and that can be dangerous whenever you go outside," cautioned National Weather Service meteorologists. "Even if you're driving a short distance and don't intend to be outdoors; take warm clothes, boots, mittens, and hats. If your car breaks down or you're involved in an accident, you may have to wait longer than 10 minutes for assistance and you can be in real danger if you're not protected."
Daytime temperatures on Tuesday will reach 5 above to 10 below zero and wind chill values will range from -15 to -30 degrees. Lows will be even colder Tuesday night and Wednesday morning--ranging from -15 to -30 degrees. Lighter winds will result in wind chill values from -20 to -40 degrees.