IMO 2 examples come to mind:
1st: In Uncanny X-Men #251, 253: When Storm inadvertently create a Storm that spanned from Illinois to Australia.
-Due to the Effects of fighting The X-Men Villain "Nanny"
2nd: In Worlds Apart #4: Storm affects the Weather on a Planetary Scale. (Again for the 3rd time)
Of Course there are A LOT more.