The last two snowstorms missed the upper Midwest, taking a southern track from New Mexico, Texas, Arkansas, Tennessee, Kentucky, into Virginia and up the East Coast. The weekend of Feb 6-7 gave D.C. a good dump of the white stuff.
This latest storm stayed North, starting on Mon Feb 8, and by early evening had dropped up to 8" of snow in MN and IA, heading almost due East. The storm was said to be 1300 miles wide, and moving slow. Chicago had cancelled about 600 flights by Tuesday at noon from both major airports. Not necessarilly considered a 'blizzard', it was the duration of the snow that was expected to pile up from 8-12" by Wednesday morning. By Tuesday, the Easterly track was already dumping more snow on Washington DC, on top of their existing 24". It could leave 12" more before moving on.
As the storm moves, it will kick in winds that will add yet more Lake Effect snows to the Western and Southern areas of Lake Michigan, mostly Chicago and Northwest Indiana. Temperatures are predicted to be cooler than normal, ranging from the mid teens to mid 20's.