A storm system will impact Iowa Thursday into Friday, bringing widespread chances for precipitation and the chance for accumulating snowfall across portions of the state. As we have been noting the past 24 hours, the models have been coming in further south with the system. What does this mean?
Precipitation may begin early Thursday across northern Iowa with a brief period of a wintry mix causing a light glazing of ice. Yesterday, with the models were taking this system further to the north, and it appeared that most of the heavy snowfall would stay in southern Minnesota. Now that they models are trending back south once again, this has shifted the snowfall totals south. The greatest snowfall accumulations appear to fall across northern Iowa where moderate accumulations will be possible.
Further south across central and southern Iowa, precipitation may start as rain before transition to some light snow by late Thursday night into Friday. This transition area will drop south and east during the day and impinge on the Des Moines metro area toward sunset. This could be quite problematic around rush hour Thursday evening as temperatures drop below freezing near sunset with falling precipitation leading to quick development of ice on area roadways.
In addition, the winds will be quite brisk and may lead to some reduce visibilities in the snow areas of the north overnight. Due to the light to moderate snow across northern Iowa, and the strong winds, a winter weather advisory would appear likely.