A major crash involving over 50 cars on I-35 has the highway shut down near Ames, IA this afternoon, as road conditions continue to worsen during this winter storm.

PHOTO: Iowa DOT

Police advise motorist to stay off the roads for the next several hours to allow the storms to pass and for road crews to do their jobs.

The storm is expected to dump 5-7" of snow, followed by sub zero temperatures overnight.  The winter weather advisory remains in effect until 7:00 p.m. tonight