This seem impossible, because CO2 was just too low to have violent weather. Hansen tells us that the climate is stable below 350 ppm.
THE MOST NOTORIOUS TORNADO IN MISSISSIPPI HISTORY IS THE NATCHEZ TORNADO OF MAY 7, 1840. THIS TORNADO STARTED ACROSS THE RIVER IN CONCORDIA
PARISH, LA, AND MOVED UP THE MISSISSIPPI RIVER, KILLING HUNDREDS OF PEOPLE ON BOATS AND BARGES BEFORE KILLING SEVERAL DOZEN MORE IN NATCHEZ ITSELF. AT LEAST 317 PEOPLE WERE KILLED BY THIS TORNADO, MAKING IT THE SECOND DEADLIEST TORNADO IN UNITED STATES HISTORY.
Very little correlation between CO2 levels and violent tornadoes.
I want a recount. Yours truly, 350.org