There were 1,817 tornadoes recorded in the U.S. in 2004.
There were 1,103 tornadoes in the U.S. in 2006.
There were 1374 tornadoes confirmed in the United States in 2003.
1,282 tornadoes occurred in the US. in 2010, with an unknown number worldwide.
Global data is not available, but the US had 1075 recorded tornadoes in 2000.
In 2009, 22 people in the U.S. were killed by tornadoes.
Official record shows 1,263 tornadoes in the United States in 2005.
The strongest tornadoes in the United States have mostly occurred on the Great Plains and in the Deep South.
Since 1950, the US has recorded more than 57,000 tornadoes. However, since we missed many of the weaker ones, the number is probably closer to 80,000.
The United States experienced 1.374 tornadoes in 2003 and 1,817 (a record high) in 2004. This works out to a difference of 443 tornadoes.
That is impossible to determine. The United States averages over 1000 tornadoes every year, many of them occurred before we started keeping records of them.
Tornadoes occur in many areas around the world by no region experiences more tornadoes than the central United States. No one really knows for sure how many there are in the US each year, but it is estimated that over 1,000 tornadoes occur each year in the US, although many go undetected and unreported.
In the past 10 years (counted as 2002 to 2011 as data for 2012 so far is preliminary) there have been 13,411 confirmed tornadoes in the U.S.