A flash flood warning for most of the Chicago area was issued Friday afternoon as an unusually rainy January day creates a flooding risk in part due to frozen soil.

Heavy rain and rumbles of thunder were expected throughout the Friday morning commute, the NBC 5 Storm Team said, with some slick spots expected and low visibility due to fog.

While Groundhog Day remains a fun tradition, meteorologists rely on data and computer models for more accurate forecasts.

The Chicago area is under a Dense Fog Advisory until 9 a.m. Friday as rainy conditions continue. The bigger rainmaker arrives Friday morning and looks like it’ll linger until the early afternoon hours ...