Deadliest single tornado in the world: April 26, 1989 - Bangladesh - A massive tornado claimed 1,300 lives.

The 10 Deadliest tornadoes in U.S. history:

1. Tri-State Tornado - March 18, 1925 - 695 dead.
2. The Great Natchez Tornado - May 7, 1840 - 317 dead.
3. The East St. Louis Tornado - May 27, 1896 - 255 dead.
4. The Tupelo Tornado - April 5, 1936 - 233 dead.
5. The Gainesville Tornado - April 6, 1936 - 203 dead.
6. The Glazier-Higgins-Woodward Tornadoes - April 9, 1947 - 181 dead.
7. The Amite-Pine-Purvis Tornadoes - April 24, 1908 - 143 dead.
8. The New Richmond Tornado - June 12, 1899 - 117 dead.
9. The Flint Tornado - June 8, 1953 - 115 dead.
10. The Waco Tornado - May 11, 1953 - 114 dead.

Fastest ground speed: 73 mph (117 kph) from the Tri-State Tornado

Slowest ground speed: Less than 10 mph (16 kph) during The Jarrell Tornado.

Costliest tornado: The F5 tornado that moved into Oklahoma City on May 3, 1999. That tornado caused $1.24 billion in damage.

Costliest thunderstorm: May 16, 1995 during the "Mayfest" in Fort Worth, Texas. A hailstorm with hailstones the size of grapefruits hit the city causing $2 billion in damage.

Last tornado to kill more than 40 people: April 10, 1979 - Wichita Falls, Texas - 45 dead.

First confirmed tornado in the U.S.: July 8, 1680 - Cambridge, Massachusetts - 1 dead.

Deadliest tornado of the 80s: May 22, 1987 - Saragosa, Texas - 23 dead.

Biggest outbreak in the fall: 143 tornadoes broke out in 41 hours of continuous tornado activity from November 21 to 23, 1992.

Longest span without an F5 tornado: Probably as of this writing. As of February 7, it has been 4 years 280 days since the United States has had a F5 tornado. The last hit in Oklahoma City during the May 3, 1999 event.

Latest in the year without a tornado: The first confirmed tornado of 2003 hit in Mississippi on February 15.

Slowest years for tornado outbreaks: Probably the 10 most insignificant years of the last 50 for tornado outbreaks were: 1994, 1988, 1986, 1983, 1978, 1977, 1976, 1972, 1969, and 1954.