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Author Topic: fwd hail does not exist email  (Read 1972 times)

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  • Guest
fwd hail does not exist email
« on: April 27, 2006, 08:37:31 PM »

Hail does exist

Hail forms on condensation nuclei such as dust, bugs, or ice crystals when supercooled water freezes on contact. In clouds containing large numbers of supercooled water droplets, these ice nuclei grow quickly at the expense of the liquid droplets because the saturation vapor pressure over ice is slightly less than the saturation vapor pressure over water. If the hail stones grow large enough, latent heat released by further freezing may melt the outer shell of the hail stone. The growth which follows, usually called wet growth, is more efficient because the liquid outer shell allows the stone to accrete other smaller hail stones in addition to supercooled droplets. Once a hailstone becomes too heavy to be supported by the storm's updraft it falls out of the cloud. The reason rain can't fall, is typically because of the strong winds inside a thunderstorm cloud -- keeping the rain in and freezing it, making it hail that grows bigger and bigger.

Even though temperatures at this height are below freezing, most of the cloud's moisture is super cooled. This means it remains liquid because it lacks a surface on which to freeze. As soon as a super cooled droplet collides with potential nuclei—ice crystals, frozen raindrops, dust, or salt—it freezes quickly. :lol:

GOD bless


  • Guest
fwd hail does not exist email
« Reply #1 on: April 27, 2006, 10:32:53 PM »

I thought hail was hot, now you tell me it's cold. Oh well, you learn something new everyday :!:
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