It appears the Arctic air will crash into us immediately following Sunday’s snow. Expect temps of -17 by Monday morning drive time. The “high” Monday will be -13. The low Monday night still looks like -19. The high Tuesday will be about zero, give or take a degree, and it may stay around there through Tuesday night.
Wind chills Monday and Tuesday should run between about 30 and 40 degrees below zero. Expect wind chill warnings to be issued.
A Winter Storm Watch is in place for Sunday. My forecast remains 6-12 inches, with the lower end probably occurring around the northwestern third of the state, including Lafayette and South Bend. Most of central Indiana will be closer to *at least* 8 inches. The snow could start after midnight early Sunday. It will be heaviest in the midday and afternoon. Wind speed will gradually increase through Sunday afternoon, and near-blizzard conditions may develop as powdery snow gets whipped by gusty winds Sunday night into Monday morning.