What time of day do tornadoes usually occur in?
The process for making snow is fairly simple.
Condensation nuclei (soil, salt, etc.)
act as sites for water vapor to freeze onto,
expanding as snow crystals with time. The air
that snow crystals form in must be near or
above saturation (relative humidity near 100%)
and below freezing.
The same process is used by man-made snow
machines at ski resorts.
The howstuffworks website at
gives a good description of how snow is
made by nature and also how man-made snow is made.
You can also use a web browser search engine
such as Google (type in "snow maker") to find
web pages that tell you how to make your own
home-made snow maker.
David R. Cook
Climate Research Section
Environmental Science Division
Argonne National Laboratory
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Update: June 2012