On this day in 1840, the second deadliest tornado in the US ripped a 35-mile path through Concordia Parish, LA, to Adams County, MS. At Natchez MS, the mile-wide funnel leveled buildings and sunk several boats on the river. At least 48 people were killed in Natchez and 269 on the river. Reports that “hundreds” of people were killed on plantations in LA are possible but never confirmed. The official death total stands at 317, with 109 people injured, though it is likely that these numbers are too low. Thomas Grazulis lists this tornado as an F4 in his Book “F5-F6 Tornadoes”. Source: F5-F6 Tornadoes.