UPDATE (WKOW) -- A Wind Chill Warning remains in effect for all of southern Wisconsin until noon Tuesday.
Wind chills will slowly improve from around -35 Tuesday morning to -10 by late afternoon.
Frostbite can develop on exposed skin within about 10 minutes Tuesday morning, so make sure you have everything covered.
Temperatures will improve later in the week with highs into the low 20s by Thursday. By Friday, temperatures will actually be too warm for snow, with sleet, freezing rain and rain in the forecast for the afternoon and evening.
The weekend is expected to be mild.
UPDATE (WKOW) -- Arctic air settled into southern Wisconsin overnight and will hang around into Tuesday.
Brisk northwest to west winds during this time will bring bitterly cold temperatures and dangerously low wind chill temperatures.
A wind chill warning is in effect until Noon Tuesday for wind chills of -30 to -45. The high temperature Tuesday is only expected to reach 2 degrees.
Skin exposure to this cold for a short period of time will cause frostbite.
Stay indoors if possible. If you must travel, carry a winter survival kit.
This is a life threatening situation for anyone who becomes stranded outdoors.
It will stay bitterly cold through Wednesday before temperatures warm up significantly late in the week.
Highs should be around freezing by Friday and the weekend.
UPDATE (WKOW) -- The bitter cold air mass expected over Wisconsin is the worst in about 18 years.
MADISON (WKOW) -- Temperatures will dip below zero over the next few days and wind chills could take temperatures to dangerous levels.
It will get warmer on Saturday, with a forecasted high of 26. But after that, temperatures will plunge again. Dangerously cold air arrives Sunday and will stick around through Tuesday. The high on Sunday is expected to be just 3 degrees, followed by a high of -10 on Monday. Wind chills late Sunday night & early Monday may be around -40.
Make sure you bundle up if you head outside. These conditions could lead to frost bite and hypothermia if you don't take precautions.