A National Weather Service meteorologist estimates the tornado that hit Evansville and adjacent Warrick County ranked as an F3 on the Fujita scale of tornado magnitude.
Ryan Presley of the Weather Service office in Paducah, Kentucky, says it appears a single twister about 500 yards wide caused all of the destruction. Winds ranged from an estimated 158 mph to 206 miles-per-hour.
The tornado first touched down near the town of Smith Mills in northwestern Kentucky, about 2:00 local time, jumped over the Ohio River and then churned to the northeast through Indiana's Vanderburgh and Warrick Counties. It dissipated northeast of the town of DeGonia Springs, which is just east of Boonville.
Presley says the storm's total path covered 15 to 20 miles.