Category 6: Day of Destruction (2004 TV miniseries)
starring Thomas Gibson, Nancy McKeon, Chandra West, Randy Quaid, Dianne Wiest, Brian Dennehy
IMDb synopsis:
Tornado in Las Vegas. Heat in Chicago. Hail in Illinois. A snowfall and a storm force flows towards Chicago. It's just the beginning of a series of weather anomalies. The lights go off. People panic. A few courageous people are trying to solve the riddle of infuriated nature and prevent mass destruction.
I watched it this past weekend on the Sci Fi Channel during their disaster movie marathon.