High rates of snowfall produced slushy accumulations across north and east Iowa on Thursday, December 28, prompting official warnings to motorists to take care on “slick” roads.This timelapse video from the Cedar Rapids Police Department shows snow progressively coating the parking lot outside the main police station.The National Weather Service advised drivers to “slow down and drive carefully” as visibility could drop to less than a mile in some areas. Credit: Cedar Rapids PD via Storyful