From 2011:  Rainy Spring Ahead: “According to current projections by May 20, Mississippi River stages will reach their highest flood elevation since the 1927 flood at the Vicksburg gauge. It should be noted that the 2011 information is from Sunday, April 24, National Weather Service forecasts which have not yet been fully adjusted for the 5-inch  to 9-inch accumulation of rainfall that is projected across the Arkansas and Ohio River basin later this week. It is estimated that this rainfall accumulation could account for another May, 2011, adjustment at Vicksburg, of possibly as much as 12 inches to 18 inches.