The 2034 Florissant, Missouri tornado was a deadly, violent EF5-rated tornado which impacted the suburbs of St. Louis, Missouri, primarily the second-ring city of Florissant, late in the afternoon of Thursday, June 8, 2034. Touching down at 5:11 PM CDT near Maryland Heights, the tornado tracked through central and central-eastern Florissant, leaving behind catastrophic damage and numerous deaths, before dissipating at 5:48 PM near Old Jamestown.
The tornado caused 31 deaths and 467 injuries over its 37-minute existence, and left a path 14.80 miles long and 735 yards wide at its peak. While the majority of damage in Florissant was consistent with EF4 winds, damage surveyors were able to identify at least three small areas of "definitive EF5" damage, with the most intense damage taking place near the intersection of St. Catherine Street and Waterford Drive, where 14 of the 31 fatalities occurred. In the same area, a RaXPol mobile radar recorded wind speeds of 234 miles per hour within the tornado.
In July of 2034, a secondary damage survey disputed the tornado's EF5 rating, noting that house construction quality in the worst affected areas was "slightly less than optimal". A third damage survey, conducted in October of 2034, however, reinforced the EF5 rating, believing that the extent and consistency of the destruction in the worst affected areas indicated ground level winds of more than 200 miles per hour.
The National Weather Service stated that the tornado was "almost a worst-case scenario", passing near the center of a large city in the late afternoon, crossing several congested roads, and intensifying as it made its closest approach to the city center. Official statements claimed that had the tornado's path been oriented a half mile farther to the west, or had the tornado developed 20 minutes later, the death toll may have tripled; while a death toll of "several hundred" would have been likely had the tornado cut through St. Louis itself.