The next weather system to affect Iowa is approaching from the west. The system will bring a variety of winter weather to northern Iowa this evening through Saturday morning. Temperatures should be cold enough for snow across northwest but further east, a warm layer aloft will allow for sleet and freezing rain to occur along and north of the highway 20 corridor.
Snow will develop across the northwest later this evening and become widespread overnight. As the precipitation spreads east overnight, it will fall as a wintry mix. Snow accumulations up to three inches of snow will fall across northwest portions of the advisory area with two to three hundredths of ice accrual possible along the highway 20 corridor.
An east wind will increase overnight through Saturday morning to speeds of 10 to 20-mph causing reductions and visibilities at times and further diminishing stability on ice covered surfaces.The wintry mix of precipitation will produce slick surfaces causing difficult driving conditions.