There have been many thousands of tornadoes in the United states.
This country averages over 1000 tornadoes every year.
Every state has had at least a few weak tornadoes.
There were 1692 confirmed tornadoes in the U.S. in 2011.
All 50 states get tornadoes though they are rare in many of the states.
The U.S. averages about 1200 tornadoes per year.
Tornadoes are not limited to flat lands and contrary to popular belief hills do not hinder tornadoes. On many occasions they have been spotted in hilly or mountainous areas. Tornadoes are very common the the Great Plains of North America, which are flat, but this has more to do with climate than topography.
There were 102 tornadoes in Oklahoma in 2010.
yes tornadoes and dust devils are common in Africa
There have been three tornadoes in Davenport Iowa since records began in 1950.
From 2010 to 2011 there were 47 tornadoes in Pennsylvania.
In the years 2000-2010 there have been 13,817 tornadoes confirmed in the United States.
It is impossible to know as records are incomplete and many tornadoes were missed before the implementation of Doppler radar in the early 1990s. Since 1950, there have been nearly 57,000 recorded tornadoes in the U.S. as well as an unknown tens of thousands more that wen unrecorded.
Far too many to list. There are many, many cities and towns in America that are not in a river's flood plain, or not in a particularly tornado-prone area.