The windchill has officially climbed below 0° and it mostly likely won't climb above until Wednesday afternoon. The Arctic air has officially entered Indiana, and lows tonight are expected to fall to near 0° with wind chills falling to -15° below. A Cold Weather Advisory starts at 7 PM Sunday and continues through 10 AM Wednesday for all of Central Indiana. Wind chills are expected to fall to 15-25 below 0 over the next few days. Make sure you stay up to date on school closings. Wind chill will remain below 0° all day tomorrow so cover any exposed skin as frostbite could set in as little as 30 min.