During Skyrim's Main Quest you're given the 3 words and knowledge to perform the shout "Clear Sky" which is required to
reach the Throat of the World where Paarthurnax is.
The shout is used in this part to clear away the fog which saps at your health but i am wondering, outside of this can Clear Sky be used for anything else, i've tried shouting at the sky when it was raining at Riverwood but it didn't do anything (apart from making me look like an idiot and embarrassing my wife Lydia)