Jehovah’s “glorious voice,” raised against the enemy (Isa 30:27), is again mentioned here, in contrast to the music (Isa 30:29) with which His people shall come to worship Him.
lighting down of ... arm - (Isa 30:32; Psa 38:2). The descent of His arm in striking.
scattering - namely, a blast that scatters, or an “inundation” [Maurer].