Thank you, Chris.
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Found ruling on Call Lightning Storm:
“It functions like Call Lightning: You get one bolt as part of casting the spell, after that it’s a standard action to call a bolt.”
Call Lightning — “Immediately upon completion of the spell, and once per round thereafter, you may call down a 5-foot-wide, 30-foot-long, vertical bolt of lightning that deals 3d6 points of electricity damage”