World's Deadliest Tornado

The U.S. may see the largest number of tornadoes per year, but the strength and damages of any tornado that landed in the U.S. does not compare to the tornado that struck Bangladesh in 1989.
"The violent tornado carved a path a mile wide and 10 miles long, destroying the towns of Manikgank Sadar and Saturia. An estimated 1,300 people were killed and an additional 12,000 injured.
All structures in a 2.3-square-mile-wide area were destroyed along a portion of the path of the tornado, which left an estimated 80,000 people homeless."
"Dr. Greg Forbes, The Weather Channel's severe weather expert, notes that Bangladesh experiences some of the strongest and deadliest tornadoes outside the U.S., possibly up to F4 or even F5 intensity. That said, according to [an] article by Paul and Bhuivan, the country only averages more than six tornadoes per year. This is much less than the U.S. 10-year average of 1,294 tornadoes annually."

Also, their high number of death counts are equally due to "high population density, poor building construction and no warnings systems."

http://www.weather.com/news/tornado-central/deadliest-tornado-world-bangladesh-20140416