A tornado is a violently rotating column of air in contact with the ground. While a visible condensation funnel is not required, a tornado must have circulation touching the ground. Tornadoes can have wind speeds between 40 and over 300 mph and form through a process called tornadogenesis. The deadliest tornadoes on record include the 1925 Tri-State Tornado that killed 695 people across multiple states and the 2011 Joplin, Missouri tornado that killed 158 people and destroyed over a thousand structures.

1. Tor nad oes
 A tornado is a violently rotating column of air in contact
with the ground
 Tornadogenesis is the formation of a tornado
 A visible condensation funnel is NOT necessary to have
a tornado
 However, just a funnel without a circulation in contact
with the ground is NOT a tornado
 Tornadoes may have wind speeds between 40 and
300+ m.p.h!

2. 0
10
20
30
40
50
60
70
2007 2008 2009 2010 2011
EF3
EF4
EF5
Key
NumberofTornadoes
Years
N umber of Tor nad oes in 2 0 0 7 -2 0 1 1

3. Year Place Name Name of Tornadoes Dam
arch,1925 Missouri, Illinois and Indiana "Tri-State Tornado" Killed 695 people
2,027.
y,1840 Mississippi River in Louisiana and
Mississippi
"Natchez Tornado" Killed 317 people
109.
ay,1896 Missouri and Illinois "St. Louis Tornado" Killed 255 people
1,000.
il,1936 The Northeastern Mississippi city "Tupelo Tornado" Killed 216 people
700.
il,1936 Gainesville, Georgia "Gainesville Tornado" Killed 203 people
1,600. The tornad
blocks and 750 h
northern Georgia
il,1947 Texas, Oklahoma and Kansas "Woodward Tornado" Killed 181 people
970.
ay,2011 Joplin, Missouri - Killed 158 people
more than a thou
Deadliest Top 10 Tornadoes of U.S