Here are some notable tornado records that remain unbroken.

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

The 10 Deadliest tornadoes in Canadian history:

1. Regina, Saskatchewan - June 30, 1912 - 28 dead.
2. Edmonton, Alberta - July 31, 1987 - 27 dead.
3. Windsor, Ontario - June 17, 1946 - 17 dead.
4. Pine Lake, Alberta - July 14, 2000 - 11 dead.
5. Valleyfield, Quebec - August 16, 1888 - 9 dead.
6. Windsor, Ontario - April 3, 1974 - 9 dead.
7. Barrie, Ontario - May 31, 1985 - 8 dead.
8. Sudbury, Ontario - August 20, 1970 - 6 dead.
9. St. Rose, Quebec - June 14, 1892 - 6 dead.
10. Portage la Prairie, Manitoba - June 23, 1922 - 5 dead.

Biggest outbreak of tornadoes: The Super Outbreak, in which 148 tornadoes affected 13 states and one Canadian province on April 3 and 4, 1974.

Highest winds in a tornado: The F5 tornado that moved into Oklahoma City on May 3, 1999. A doppler radar near the tornado measured winds of up to 318 mph inside the cyclone.

Fastest ground speed: 73 mph (117 km/h) from the Tri-State Tornado

Costliest tornado: The Oklahoma City tornado of May 3, 1999 caused more than $1 billion in damage. This was the first time in history damages from a single tornado exceeded this amount.

Last tornado to kill more than 40 people: May 3, 1999 - Oklahoma City - 42 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 - 30 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.

Most tornadoes spawned from a hurricane: 117 tornadoes spun out of Hurricane Frances upon landfall in Florida in September 2004. The old record was 115 from Hurricane Beulah in 1967.

Most significant coincidence: A small town in Kansas called Codell was hit by a tornado on the exact same date three years straight! A tornado hit on May 20, 1916, 1917, and 1918. The U.S. gets 100,000 storms a year; only 1% produces a tornado. The odds of this coincidence occurring again is practically infinitesimal to nonexistent.