How Are Tornadoes Formed


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** How Are Tornadoes Formed **

by Jerry Coffey on August 24, 2010

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How Are Tornadoes Formed

Tornado at Union City, Oklahoma Credit: NOAA Photo Library

Tornadoes are usually the extreme result of a very large thunderstorm
called a supercell. During the storm cold air and warm air combine. The
cold air goes drops as the warm air rises. The warm air eventually twists
into a spiral and forms a funnel cloud. The sky turns a very dark green
color and the tornado begins its destruction.

There is a clear set of steps in the formation of a tornado. First, just
before the thunderstorm develops, a change in wind direction and an
increase in wind speed, at an increasing altitude, creates an invisible
horizontal spinning effect in the lower atmosphere. Second, rising air
within the thunderstorm’s updraft tilts the rotating air from horizontal
to vertical. Next, An area of rotation, 2-6 miles wide is contained within
a vast majority of the storm. The strongest, most violent tornadoes form
within this area of rotation. After that, a lower cloud base in the center
of the storm becomes a rotating wall cloud. This area is often nearly
rain-free. Lastly, just a very few minutes later, a tornado develops and
starts to wreak its destruction.

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Tornadoes follow a definite life cycle.


As the mesocyclone(area of organized rotation) approaches the ground, a
visible condensation funnel appears to descend from the base of the storm.
As the funnel descends, the


how is a tornado formed

Tornado - Wikipedia, the free encyclopedia


** Tornado **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the weather phenomenon. For other uses, see Tornado
For the current tornado season, see Tornadoes of 2013.
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A tornado near Anadarko, Oklahoma. The /funnel/ is the thin tube reaching
from the cloud to the ground. The lower part of this tornado is surrounded
by a translucent dust cloud, kicked up by the tornado's strong winds at the
surface. The wind of the tornado has a much wider radius than the funnel

Part of the nature series
Calendar seasons
· Spring
· Summer
· Autumn
· Winter

Tropical seasons
· Dry season
· Wet season

· Thunderstorm (Thundersnow)
· Supercell
· Downburst
· Lightning
· *Tornado*
· Waterspout
· Tropical cyclone (Hurricane)
· Extratropical cyclone
· Winter storm
· Blizzard
· Ice storm
· Dust storm
· Firestorm
· Cloud

· Drizzle (Freezing drizzle)
· Rain (Freezing rain)
· Snow (Rain and snow mixed â€¢ Snow grains  â€¢ Snow roller)
· Graupel
· Ice pellets
· Hail

· Meteorology
· Climate
· Weather forecasting
· Heat wave
· Air pollution
· Cold wave

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A *tornado* is a violently 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 *twisters* or
*cyclones*,^[1] 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 they are typically in the form of a visible
condensation funnel, whose narrow end touches the earth and


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