Charles Ellicott Commentary Isaiah 66:15

"For, behold, Jehovah will come with fire, and his chariots shall be like the whirlwind; to render his anger with fierceness, and his rebuke with flames of fire." — Isaiah 66:15 (ASV)

With his chariots ... —that is, the storm-clouds sweeping on their way, while the lightnings and the winds do their work. (Psalms 68:33)