What does Psalm 29:7 mean?

In this psalm, David celebrates God's power. In poetic form he described God's voice as a potent thunderstorm or series of earthquakes (Psalm 29:3–8). This verse refers to lightning, often described in the Bible as a form of "fire" (Exodus 9:23).

Perhaps it was lightning that consumed Elijah's sacrifice at Mount Carmel (1 Kings 18:38). It may have been fiery lightning that consumed the men whom the king of Samaria sent to Elijah (2 Kings 1:9–14). In Job's description of God's works he credits God with decreeing rain and a way for lightning (Job 28:26). In his description of four heavenly beings, Ezekiel writes that they had the appearance of torches. When they moved, their appearance resembled "a flash of lightning" (Ezekiel 1:14).

Jesus compared His second coming to the lightning that comes from the east and shines as far as the west (Matthew 24:27). When God judges the city of Babylon in the tribulation period, flashes of lightning will strike it (Revelation 16:18). God controls all things, including lightning!