St. Louis-An ominous spring flooding report for the upper Midwest was released in advance of last week’s heavy snows in the region. The Spring Flood Outlook, released by the National Weather Service’s St. Louis office in late January, predicts moderate to major flooding on the Mississippi River, noting that soils are saturated and tributaries are already running high in northern states, while winter precipitation levels continue to build throughout the Midwest and Northern Plains. Weather Service officials said computer models show the greatest flood risk in eight years along the Mississippi, with some locations in Minnesota, Wisconsin, Iowa, and Illinois facing an 80 percent probability of major flooding this spring. Serious flooding risks are not as great along the Missouri and Illinois Rivers, the report said, nor along areas of the Mississippi below St. Louis due to 2010 drought conditions in southeastern Missouri and southern Illinois.