ST. LOUIS, MO (KTVI)- Another winter storm has its aim on St. Louis and will bring significant snow to the region. Winter Weather Advisories and Winter Storm Warnings are in effect for the entire FOX 2 News viewing area through 6pm Sunday.Snow builds in Saturday afternoon and will continue through Sunday. As temperatures warm a bit early Sunday, the snow will change over to some freezing rain and sleet south of I-44 in Missouri and I-64 in Illinois. Along the I-70 corridor, some sleet will mix with the snow.As for totals, look for 4"-6"of snow along and north of a Rolla, MO to Festus, MO to Mount Vernon, IL line. 2"-4" of snow south of that line where there will be a mix of snow, sleet and freezing rain after midnight as warmer air tries to build northward.