It doesn't make a difference.
No. Valleys do not protect from tornadoes. In fact there is some evidence that tornadoes can intensify as they enter a valley. Saginaw was hit by a tornado in 1982.
They do hit mountainous areas, but it is not very common for two reasons. First, mountainous areas tend to be dry due to something called the rain shadow effect. Tornadoes need moisture to form. Second, mountains can interfere to some degree with the mechanisms that produce tornadoes, but once the tornado is established mountains will not stop it.
Yes, Valleys and rivers do not stop tornadoes. If tornadoes have occurred near your town or city there isn't really anything preventing a direct hit.
Yes. North Carolina has been hit by both tornadoes and hurricanes. In 2011 the state was first hit hard by both.
When plate tectonics move under the Earth's surface, sometimes they hit each other creating deep crevices or large hills. These results are what we call valleys and mountains.
Tornadoes hit the U.S. every year.
From 1950 to 2011 there were 56,221 tornadoes recorded in the U.S. of which 388 or 0.6% hit California. This figure may be somewhat skewed as for the first 30 years or so of this period the majority of tornadoes were missed.
Yes. Tornadoes do occur in Cuba. Interestingly, it is believed that the first ever footage of a tornado was taken in Cuba.
Tornadoes hit the U.S. every year.
tornadoes hit very hard very hard
Yes. Many tornadoes have occurred in forests, with some of the larger and stronger ones destroying thousands of trees.
There were 129 tornadoes in Texas in 2009.