The storm bought blizzard conditions across California's Sierra Nevada earlier this week. Heavy snow has also impacted highway travel in Arizona. At least 20 inches of snow has fallen in parts of the Flagstaff area. Snow is still falling in the Desert Southwest and southern Rockies. 

Snow, rain, and strong winds will affect much of the Southwest through Thursday. The National Weather Service still has winter storm watches and warnings in effect from Flagstaff to Santa Fe. Watches were published today for Chicago, Detroit, and parts of the interior Northeast. 

Fox Weather provides the forecast timing of the snowstorm: 

Thursday 

After burying California's Sierra Nevada mountain range under feet of snow amid blizzard conditions, the snow from this storm will spread from the southern Rockies into portions of the central and southern High Plains on Thursday.