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What is cloud seeding?
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| Cloud seeding is the process of spreading either dry ice (or more commonly, silver iodide aerosols)
into the upper part of clouds to try to stimulate the precipitation process and form rain. Since most rainfall
starts through the growth of ice crystals from super-cooled cloud droplets (droplets colder than the freezing point, 32 deg. F)
in the upper parts of clouds, the silver iodide particles are meant
to encourage the growth of new ice particles. The history of cloud seeding has seen uncertain results because
even if a cloud rains after seeding, it is not known whether the cloud would have rained anyway.
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| Interesting facts:
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| REDUCING THE INTENSITY OF HURRICANES THROUGH SEEDING? In
the early 1960's, the National Hurricane Center began a series of experiments in seeding of hurricanes to reduce
their intensity. Since the most destructive hurricane winds are produced from hurricanes with the smallest diameter
eyes, STORMFURY seeding flights tried to stimulate the growth of a new eyewall of convection outside
the inner, more destructive eyewall. Unfortunately, the project failed. It has since been determined that
there are already an abundance of ice crystals in hurricane rain systems, so the production of new ice
particles through cloud seeding probably has little if any effect.
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