Why describe God's actions using such dramatic, almost violent, natural imagery? It's more than just a description; it's theology in poetic form.
The language here is intensely poetic, using natural forces to represent God's awesome power and presence. The "arrows" flashing are lightning, a common biblical metaphor for God's swift and powerful judgment or action. The "sound" from the skies is thunder, amplifying the sense of divine proclamation or power.
This isn't a literal meteorological report; it's a theological statement. The psalmist is using the most dramatic elements of nature – storm, thunder, lightning – to convey the sheer magnitude of God's intervention during the Exodus. It’s meant to evoke awe and perhaps even a bit of fear, reminding the reader that God’s power is far beyond human comprehension. This poetic description elevates the historical event into a divine spectacle.