As of mid December 2013 there have been 12,800 officially documented tornadoes in the United States in the past 10 years. Note that figures for several months in 2013 are still preliminary.
All states have had tornadoes in the past 50 years.
Preliminary estimates show that there have been 1286 tornadoes so far in the U.S., though the actual number is probably lower. More tornadoes will probably occur before the end of the year.
Official record keeping for tornadoes in the U.S. began in 1950. Annual tornado death tolls are available as far back as 1875, though their accuracy is not as great as it is for years after 1950. Other data is hit-miss.
Since official record keeping began in 1950, there have been 58,009 tornadoes recorded in the U.S. The actual number of tornadoes is likely much higher though, as in the early part of this period we missed many of the weaker tornadoes. Modern records suggest the U.S. averages between 1,200 and 1,300 tornadoes per year. This suggests that more than 75,000 tornadoes ocurred in this time period, and likely more than 80,000.
Tornado season begins in March and ends in July. April is historically the deadliest month, although May has more tornadoes. However, tornadoes hit the U.s. in all months. Tornado season is simply more active.
All states have had tornadoes in the past 50 years.
Texas by far has had the highest number of tornadoes in the past 50 years.
In the past 5 years (2010-2014) tornadoes have hit every state except Alaska.
In the years 2001-2002 Georgia had 36 confirmed tornadoes.
There were 949 recorded tornadoes in Illinois in the years 2000 to 2016.
Depends on where you are, whether you want to know how many tornadoes have hit the United States, or a single state, or even somewhere else.
There were 737 tornadoes in Alabama in the years 2001-2011.
Georgia had 395 tornadoes in the years 2001-2011.
Tornadoes hit the U.S. every year.
In the years 2001-2011 there were 650 confirmed tornadoes in Illinois.
There were 644 tornadoes recorded in Georgia in the years 1991-2011.
Although Dallas has had tornadoes in the past the "super tornado" that was depicted as hitting the city was a purely hypothetical event meant to illustrate a worst-case scenario. It never really happened. In the past 60 years the strongest tornado to hit Dallas was an F3.