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The Cause of Tornadoes.

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  • kirk
    Opinions? Kirk http://nov55.com/tor.html The Cause of Tornadoes Tornadoes are caused when a cloud of the right size precipitates rapidly releasing heat, which
    Message 1 of 2 , Oct 8, 2002
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      Opinions?
      Kirk

      http://nov55.com/tor.html
      The Cause of Tornadoes
      Tornadoes are caused when a cloud of the right size precipitates rapidly
      releasing heat, which causes it to rise and creates a vacuum under it. Air
      rushing under it creates the vortex.

      As much as tornadoes have been studied, and as obvious as the physics is,
      the weather predicters still don't have it figured out. Only newly forming
      rain clouds can create tornadoes, yet tornado warnings are always given for
      old clouds.

      It is known that a sudden drop in air pressure precedes tornadoes. The
      pressure drop is caused by a cloud near the ground rising rapidly creating a
      partial vacuum below it.

      Precipitation releases as much heat as evaporation absorbs. But
      precipitation tends to be much faster than evaporation. So a very large
      amount of heat is released when a cloud precipitates.

      Heat of course causes air to rise. When a cloud near the ground rises, it
      creates a partial vacuum under it.

      The cloud must be the right size for a tornado to occur. A very large cloud
      would not precipitate uniformly, so the whole cloud would not rise at once.
      A very small cloud would not produce enough precipitation or heat to create
      a large enough vacuum for a tornado to form.

      Also, the height from the ground would be important, because the speed at
      which the air moves in rushing under it will depend upon the amount of space
      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 reported,
      doppler radar shows that a new cloud formed out of nowhere where the tornado
      was said to be.

      Therefore, if people are to be warned in advanced, it has to be for an area
      where clouds are expected to form but have not yet appeared.

      It might be possible to prevent a cloud from creating a tornado by seeding
      part of it, so it precipitates prematurely and nonuniformly. But the time
      factor would be a problem in locating a newly forming cloud.

      Cumulous clouds will not create tornadoes, because they dissipate energy
      continuously, and they precipitate too high in the air. A tornado cloud has
      to form rapidly and dissipate its energy all at once. This occurs when hot,
      humid air hits colder air. A typical example is gulf air turning north and
      colliding with other air over Arkansas. In the northern plains, clouds
      usually form more gradually and dissipate energy through cumulous
      formations.


      [Non-text portions of this message have been removed]
    • fredwx
      Precipitation releases no heat. Condensation does. The heat is released when wather vapor condenses into cloud droplets and this is the energy that drives the
      Message 2 of 2 , Oct 9, 2002
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        Precipitation 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
        strong rotation"

        http://www.nssl.noaa.gov/NWSTornado/


        --- In methanehydrateclub@y..., "kirk" <kirk@3...> wrote:
        > Opinions?
        > Kirk
        >
        > http://nov55.com/tor.html
        > The Cause of Tornadoes
        > Tornadoes are caused when a cloud of the right size precipitates
        rapidly
        > releasing heat, which causes it to rise and creates a vacuum under
        it. Air
        > rushing under it creates the vortex.
        >
        > As much as tornadoes have been studied, and as obvious as the
        physics is,
        > the weather predicters still don't have it figured out. Only newly
        forming
        > rain clouds can create tornadoes, yet tornado warnings are always
        given for
        > old clouds.
        >
        > It is known that a sudden drop in air pressure precedes tornadoes.
        The
        > pressure drop is caused by a cloud near the ground rising rapidly
        creating a
        > partial vacuum below it.
        >
        > Precipitation releases as much heat as evaporation absorbs. But
        > precipitation tends to be much faster than evaporation. So a very
        large
        > amount of heat is released when a cloud precipitates.
        >
        > Heat of course causes air to rise. When a cloud near the ground
        rises, it
        > creates a partial vacuum under it.
        >
        > The cloud must be the right size for a tornado to occur. A very
        large cloud
        > would not precipitate uniformly, so the whole cloud would not rise
        at once.
        > A very small cloud would not produce enough precipitation or heat
        to create
        > a large enough vacuum for a tornado to form.
        >
        > Also, the height from the ground would be important, because the
        speed at
        > which the air moves in rushing under it will depend upon the amount
        of space
        > 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
        reported,
        > doppler radar shows that a new cloud formed out of nowhere where
        the tornado
        > was said to be.
        >
        > Therefore, if people are to be warned in advanced, it has to be for
        an area
        > where clouds are expected to form but have not yet appeared.
        >
        > It might be possible to prevent a cloud from creating a tornado by
        seeding
        > part of it, so it precipitates prematurely and nonuniformly. But
        the time
        > factor would be a problem in locating a newly forming cloud.
        >
        > Cumulous clouds will not create tornadoes, because they dissipate
        energy
        > continuously, and they precipitate too high in the air. A tornado
        cloud has
        > to form rapidly and dissipate its energy all at once. This occurs
        when hot,
        > humid air hits colder air. A typical example is gulf air turning
        north and
        > colliding with other air over Arkansas. In the northern plains,
        clouds
        > usually form more gradually and dissipate energy through cumulous
        > formations.
        >
        >
        > [Non-text portions of this message have been removed]
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