αὐτῷ

From LSJ

ὥσπερ ἀνέµου 'ξαίφνης ἀσελγοῦς γενοµένου → just as when a wind suddenly turns foul, just as when a wind suddenly turns nasty

Source

French (Bailly abrégé)

dat. de αὐτός.

Russian (Dvoretsky)

αὐτῷ: dat. к αὐτός.