Tornado

Български: Торнадо, Смерч
Deutsch: Tornado
Ελληνικά: Σίφωνας
English: Tornado
Español: Tornado
Français : Tornade
Česky: Tornádo
Slovenčina: Tornádo
日本語: 竜巻(トルネード)
한국어: 토네이도
Русский: Смерч
中文（繁體）‎: 龍捲風
中文（简体）‎: 龙卷风

A tornado is a violently rotating column of air, going up from the ground along a warm front. It is caused from cold air rotating clockwise and downward and, therefore, causing another whirl of warm and moist air rotating upward and anticlockwise.

Photographs [redaguoti]

A tornado near Minco, Oklahoma.
Occluded mesocyclone tornado.
Project Vortex. The Dimmitt Tornado.
Project Vortex. The Dimmitt Tornado.
An occluded mesocyclone tornado rated an F3 by an NWS damage survey.
Occluded mesocyclone tornado.
Mayfield Tornado.
Tornado at beginning of life - condensation funnel has not yet reached ground.
Tornado with dust and debris cloud forming at surface.
Tornado with large dust cloud obscuring funnel shape.
The first tornado captured by the NSSL doppler radar and NSSL chase personnel.
The first tornado captured by the NSSL doppler radar and NSSL chase personnel.
Alfalfa Tornado.
A rope tornado in its dissipating stage. The horizontal lines in the foreground are are power cables.
A shear funnel observed by members of the VORTEX project.
1957 Dallas Tornado, approaching the city as a multi-vortex twister.
Terracina (Lazio, Italia), piccola tromba d'aria marina (tornado sul mare) davanti la città l'11 agosto 2006
Category F5 tornado in Manitoba, Canada, 2007.

Radar [redaguoti]

A classical "hook echo" as seen in the strongest tornado in the 1999 Oklahoma Tornado Outbreak.
A doppler radar image indicating the presence of a tornado over De Land, Florida.
Doppler radar image of a tornado-producing mesocyclone over Salina, Kansas on June 11, 2008.