During the great flood of July 1993 in the upper mississippi river basin, the southeastern united states experienced persistent high atmospheric pressure and a drought.
The 1993 flood was caused by unprecedentedly severe meteorological and hydrologic conditions. A wet autumn in 1992 set the stage by increasing soil moisture and reservoir levels beyond average in the Missouri and Upper Mississippi River basins. The 1993 Great Flood affected nine states, flooded over 400,000 square miles, and lasted for approximately 200 days in certain areas.
Consistent weather patterns that brought storms to the same areas soon followed these conditions. The Upper Midwest was pounded by massive volumes of precipitation because to these storms' persistent, recurring character and expansive height during the late spring and summer. More than 4 feet of rain fell in some regions. Every day from the end of June through the end of July, the upper Mississippi basin had precipitation of some kind. Heavy downpours continued to form virtually daily throughout much of the summer in the Upper Midwest due to a weather pattern that is more common in the spring but unusual in the summer.
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