Severe weather including tornadoes form when
cold dry continental polar air (from the
Canadian shield in northern Canada) abuts warm
tropical air from the Caribbean.
The air masses are very different in
temperature and humidity and where the two
distinct air masses meet, instability
develops. This instability is ultimately what
gives rise to intense weather.
California weather is not influenced by the
Caribbean tropical air, because we are far too
west and because weather systems move west to
east at our latitude. For this same reason we
get almost no thunderstorm activity (a weak form
of severe weather) in CA.
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