Psalm 29:3 New English Translation

³The Lord’s shout is heard over the water;^[a]
the majestic God thunders,^[b]
the Lord appears over the surging water.^[c]

Psalm 29:3 tn Heb “the voice of the Lord [is] over the water.” As the next line makes clear, the “voice of the Lord” is here the thunder that accompanies a violent storm. The psalm depicts the Lord in the role of a warrior-king, so the thunder is his battle cry, as it were.
Psalm 29:3 tn The Hebrew perfect verbal form is probably descriptive. In dramatic fashion the psalmist portrays the Lord coming in the storm to do battle with his enemies and to vindicate his people.
Psalm 29:3 tn Traditionally “many waters.” The geographical references in the psalm (Lebanon, Sirion, Kadesh) suggest this is a reference to the Mediterranean Sea (see Ezek 26:19; 27:26). The psalmist describes a powerful storm moving in from the sea and sweeping over the mountainous areas north of Israel. The “surging waters” may symbolize the hostile enemies of God who seek to destroy his people (see Pss 18:17; 32:6; 77:20; 93:4; 144:7; Isa 17:13; Jer 51:55; Ezek 26:19; Hab 3:15). In this case the Lord is depicted as elevated above and sovereign over the raging waters.

New English Translation (NET)