St. Louis experiences thunderstorms 48 days a year on average . Especially in the spring , these storms can often be severe , with high winds , large hail and tornadoes . Lying within the hotbed of Tornado Alley , St. Louis is one of the most frequently tornadic metropolitan areas in the U.S. and has an extensive history of particularly damaging tornadoes . Severe flooding , such as the Great Flood of 1993 , may occur in spring and summer ; the ( often rapid ) melting of thick snow cover upstream on the Missouri or Mississippi Rivers can contribute to springtime flooding
Great Flood of 1993
Great Flood of 1993
St. Louis