A vigorous low pressure tracking eastward from Colorado will intensify and bring up to a foot of new snow and near-blizzard conditions to Chicago by tomorrow afternoon.
Similar conditions will occur across central Iowa, northern Illinois, Indiana, Ohio, southern Lower Michigan and Detroit, and then spread eastward with 6-12 inches of snow for New York City through Boston by Tuesday morning (all graphics courtesy of Weatherbell.com, click for full size):
The low pressure and precipitation areas forecast for Super Bowl game time suggest that being parked in front of the TV will be a safer activity than being out driving in a car: