Answer:
Persistent thunderstorms caused large amounts of rainfall over a several-state region was the cause of flooding in the 1993 upper Mississippi River flood .
Explanation:
In 1993 , Mississippi and Missouri rivers flooded , also called The Great Flood of 1993 or The Great Mississippi and Missouri Rivers Flood of 1993 .
This was among the most costly and devastating flood in United States , Destroying around 30,000 square miles , the cause of flood was thunderstorm and heavy rainfall , the wet soil condition was the cause of sever flood in the upper Mississippi River basin .