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TORNADO

 

what is a tornado

 Tornado (pl. tornadoes, not "tornados") is a very dangerous thing.

^{http://upload.wikimedia.org/wikipedia/commons/6/63/Tornado_infrasound_sources.png
Description    A picture of a tornado showing the kinds and sources of vortex infrasound generation.
Date    
Source    http://www.esrl.noaa.gov/psd/programs/infrasound/isnet/
Author    NOAA Earth System Research Laboratory
Permission
   
Public domain    This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made during the course of an employee's official duties.}

A tornado is a violent, dangerous, rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as a twister or a cyclone, although the word cyclone is used in meteorology in a wider sense, to name any closed low pressure circulation. Tornadoes come in many shapes and sizes, but are typically in the form of a visible condensation funnel, whose narrow end touches the earth and is often encircled by a cloud of debris and dust. Most tornadoes have wind speeds less than 110 miles per hour (177 km/h), are approximately 250 feet (76 m) across, and travel a few miles (several kilometers) before dissipating. The most extreme tornadoes can attain wind speeds of more than 300 mph (480 km/h), stretch more than two miles (3.2 km) across, and stay on the ground for dozens of miles (more than 100 km).

http://en.wikipedia.org/wiki/Tornado


 

[MSL]

 A link about what is a tornado:

http://www.cimms.ou.edu/~doswell/a_tornado/atornado.html

[Gay]

WOW! Good to know!