qThe objective is to convert some of the
supercooled droplets
in a cool clouds to ice and cause precipitation by the Bergeron process.
qTwo primary methods are used to trigger the
precipitation process.
qDry ice is used to lower cloud temperature to
a freezing point in
order to stimulate ice crystal production leading to the Bergeron process.
qSilver iodide initiates the Bergeron process
by directly acting
as freezing nuclei.
qUnder ideal conditions, seeding may enhance
precipitation by
about 10%.