Wait a minute (actually ten).

A cleric of Thor *stopping* a storm? Capable or not is irrelevant, the jig is up. They'll know he's not a worshipper of Thor.

He should be basking in divine glory, being so favored. What's next, cavorting with trees?

And if nobody else, Elan should figure this out, given his genre savvy and familiarity with deities (and puppets, for that matter.)