During the late spring and early summer of 1993, the midwest section of the United States experienced a prolonged period of heavy rain. This precipitation, falling on already saturated ground, produced significant flooding along the central Mississippi River basin. This paper presents the results from seasonal simulations of these Mississippi River floods. The simulations were carried out using the Florida State University Global Spectral Model at both low (T42) and high (T170) resolutions. The low resolution model is initialized on May 10 and run through August, updated only by observed sea surface temperatures. Episodes of heavier rainfall are identified and a high resolution experiment is started at the beginning of one such episode. Similar control experiments were also conducted for 1989, a year of relatively normal rainfall in the midwest region. Detailed, residue- free, moisture budgets are also calculated for the periods of model produced heavy rainfall. The simulations performed here successfully reproduced the heavy precipation signal present during the summer of 1993 for the upper Mississippi River basin. The moisture budgets reveal the important role of directional moisture transport in this heavy rainfall. The results of these experiments also highlight the limitations of low resolution for realistic modelling of seasonal heavy rain events