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| n |
For thousands of
years people have sought to modify weather and
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climate so as
to augment water resources and mitigate severe weather.
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| n |
The modern
technology of weather modification was launched by the
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discovery in the
late 1940’s that supercooled cloud droplets could be
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converted to ice
crystals by insertion of seeding material.
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| n |
For warm
clouds, large hygroscopic particles have been used to initiate
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the so-called
warm rain process earlier.
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| n |
Recently smaller
hygroscopic particles have been used to affect the
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initial droplet
spectra near cloud base.
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| n |
Over 50 years of
subsequent research have greatly enhanced our
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understanding of
precipitation processes but major gaps remain.
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