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Whenever and wherever conditions are right, tornadoes are possible, but they are most common in the central plains of North America, east of the Rocky Mountains and west of the Appalachian Mountains. Tornadoes have been known to occur in every state in the United States, on any day of the year, and at any hour. They also occur in many other parts of the world, including Australia, Europe, Africa, Asia, and South America.
Whenever and wherever conditions are right, tornadoes are possible, but they are most common in the central plains of North America, east of the Rocky Mountains and west of the Appalachian Mountains. Tornadoes have been known to occur in every state in the United States, on any day of the year, and at any hour. They also occur in many other parts of the world, including Australia, Europe, Africa, Asia, and South America.Whenever and wherever conditions are right, tornadoes are possible, but they are most common in the central plains of North America, east of the Rocky Mountains and west of the Appalachian Mountains. Tornadoes have been known to occur in every state in the United States, on any day of the year, and at any hour. They also occur in many other parts of the world, including Australia, Europe, Africa, Asia, and South America.Whenever and wherever conditions are right, tornadoes are possible, but they are most common in the central plains of North America, east of the Rocky Mountains and west of the Appalachian Mountains. Tornadoes have been known to occur in every state in the United States, on any day of the year, and at any hour. They also occur in many other parts of the world, including Australia, Europe, Africa, Asia, and South America.
Whenever and wherever conditions are right, tornadoes are possible, but they are most common in the central plains of North America, east of the Rocky Mountains and west of the Appalachian Mountains. Tornadoes have been known to occur in every state in the United States, on any day of the year, and at any hour. They also occur in many other parts of the world, including Australia, Europe, Africa, Asia, and South America.
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The first tornado captured by the NSSL doppler radar and NSSL chase personnel. The tornado is here in its early stage of formation. Union City, Oklahoma on May 24, 1973.

Photo Courtesy NOAAHorizontal cloud is ahead of tornado motion while near vertical cloud is behind. Seymour, Texas on April 10, 1979.

Photographer: D. Burgess NOAAUnion City Tornado. Union City, Oklahoma on May 24, 1973.

Photo Courtesy NOAAProject Vortex. The Dimmitt Tornado. South of Dimmitt, Texas on June 2, 1995.

Photographer: Harald Richter NOAAPhotographer: Sean Waugh NOAA/NSSLOldest Known tornado photo. 
(NOAA Image)