God came out of His holy habitation on Mt. Zion to judge. Fire and storms frequently accompanied God in theophanies, and they symbolize irresistible judgment and awesome power. [source][source][source]
"His appearance (theophany) is attended by phenomena designed to inspire "fear" in man: fire and a tempest. God is like "a consuming fire" (cf. Deuteronomy 4:24; Deuteronomy 9:3; Isaiah 66:16; Hebrews 12:29) when he comes in judgment. In his anger he may storm like a "tempest" (cf. Isaiah 66:15)." [1][source]