This is a Weather Underground forecast for Saturday, Dec. 21, 2013, for the U.S. A storm will produce showers and thunderstorms from Texas to Tennessee. Rain will be likely from the southern Plains to the Ohio Valley and portions of the Northeast. Snow will fall from the central Plains to Lower Michigan and northern New England. (AP Photo/Weather Underground)ST. LOUIS (AP) — A stew of foul climate, starting from freezing rain and snow in the Midwest to thunderstorms and possible tornadoes within the South, is arriving simply in time for one of the busiest commute weekends of the 12 months.