A Winter Weather Advisory is in effect until 6 PM Saturday for the southern two tiers of counties plus Adair, Madison, Warren, Audubon, and Guthrie county.
A Winter Storm Warning is in effect until 6 PM Saturday for the rest of central Iowa, and all of northern Iowa.
A Blizzard Warning will go into effect at 6 AM Saturday and last until 6 PM Saturday for Kossuth, Humboldt, Pocahontas, Calhoun County, Webster and Greene Counties.
Freezing drizzle will be common through the overnight, with another quick burst of snow around 3 to 4 AM. Some minor additional accumulations are possible.
Another thing to be aware of is the wind. On Saturday the wind will shift NW gusting near 45 mph. Blowing snow and blizzard conditions are expected in northwest Iowa. Visibility will be low and roads are expected to be icy in many spots.
By Sunday the wind will be weaker, but temperatures will be brutally cold. Wind chills will be near -20° during the morning.