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Tornado in the U.S. most frequently occur on the Great Plains.
It comes, literally, from assembling all of a ship's crew (all hands) at their mustering point on the ship's deck. This would occur typically in a battle situation. The idiom suggests that all personnel are needed, as for a major undertaking or project.
Georgia...
in the north
Tornadoes tend to occur during late spring to early summer in the United States.