Re: The Cause of Tornadoes.
- View SourcePrecipitation releases no heat.
Condensation does. The heat is released when wather vapor condenses
into cloud droplets and this is the energy that drives the building
Cumulus clouds. Precipitation has a net cooling effect as water
droplets fall from higher colder altitudes to lower warmer altitudes.
It also drags down cool air by friction - thats why you can feel the
cool air blast a the beginning of a thunderstorm.
"Before thunderstorms develop, a change in wind direction and an
increase in wind speed with increasing height creates an invisible,
horizontal spinning effect in the lower atmosphere.
Rising air within the thunderstorm updraft tilts the rotating air
from horizontal to vertical.
An area of rotation, 2-6 miles wide, now extends through much of the
storm. Most strong and violent tornadoes form within this area of
--- In methanehydrateclub@y..., "kirk" <kirk@3...> wrote:
> The Cause of Tornadoes
> Tornadoes are caused when a cloud of the right size precipitates
> releasing heat, which causes it to rise and creates a vacuum under
> rushing under it creates the vortex.
> As much as tornadoes have been studied, and as obvious as the
> the weather predicters still don't have it figured out. Only newly
> rain clouds can create tornadoes, yet tornado warnings are always
> old clouds.
> It is known that a sudden drop in air pressure precedes tornadoes.
> pressure drop is caused by a cloud near the ground rising rapidly
> partial vacuum below it.
> Precipitation releases as much heat as evaporation absorbs. But
> precipitation tends to be much faster than evaporation. So a very
> amount of heat is released when a cloud precipitates.
> Heat of course causes air to rise. When a cloud near the ground
> creates a partial vacuum under it.
> The cloud must be the right size for a tornado to occur. A very
> would not precipitate uniformly, so the whole cloud would not rise
> A very small cloud would not produce enough precipitation or heat
> a large enough vacuum for a tornado to form.
> Also, the height from the ground would be important, because the
> which the air moves in rushing under it will depend upon the amount
> below the cloud.
> These dynamics only exist during the first few minutes of the
formation of a
> heavy cloud. Older clouds precipitate gradually and higher in the
air, so no
> vacuum is created.
> Modern doppler radar substantiates this point. When a tornado is
> doppler radar shows that a new cloud formed out of nowhere where
> was said to be.
> Therefore, if people are to be warned in advanced, it has to be for
> where clouds are expected to form but have not yet appeared.
> It might be possible to prevent a cloud from creating a tornado by
> part of it, so it precipitates prematurely and nonuniformly. But
> factor would be a problem in locating a newly forming cloud.
> Cumulous clouds will not create tornadoes, because they dissipate
> continuously, and they precipitate too high in the air. A tornado
> to form rapidly and dissipate its energy all at once. This occurs
> humid air hits colder air. A typical example is gulf air turning
> colliding with other air over Arkansas. In the northern plains,
> usually form more gradually and dissipate energy through cumulous
> [Non-text portions of this message have been removed]