[Boromir88]

I had thought that Sauron or maybe the Witch-king stirred up the storms on Caradhras. Aiwendil, if I'm taking what you said wrong, then please correct me, but here's what I mean...

I speak of Saruman's spell, causing the storm on Caradhras.

And here's what I think would make me realize Sauron or the WK caused the storm.

The Ring goes South
"I wonder if this is a contrivance of the Enemy," said Boromir "They say in my land that he can govern the storms in the Mountains of Shadow that stand upon the borders of Mordor. He has strange powers and many allies."
"His arm has grown long indeed," said Gimli, "if he can draw snow down from the North to trouble us here three hundred leagues away."
"His arm has grown long," said Gandalf.

Here we have Boromir saying, Sauron stirs storms in the mountains around Mordor. Gimli says Sauron's arms grown long if he can trouble Caradhras and the mountains so far, and Gandalf says "his arm has grown long." To me that suggests, Gandalf believes Sauron is troubling the storms. Now, Gandalf isn't always right, so Aiwendil, I would love to see where you found how Saruman stirred the storms, because I could be missing something.