Shared ground
These verses portray a storm as creation’s response to God’s approach. The “waters” and even “the depths” are pictured as reacting with distress and convulsion, not calmness. The scene then moves upward and outward: heavy rain, thunder, and lightning fill the skies, and finally the earth itself shakes.
The text explicitly ties these natural forces to God. Lightning is called “your arrows,” and thunder is “the voice of your thunder” heard “in the whirlwind.” The effect is to present the storm as an arena where God’s presence is publicly displayed, not as a closed, purely natural system. Psalm 77:16–18
Where interpretation differs (only where needed)
Some read the “waters saw you” language as fully poetic personification: the psalmist speaks as if nature has eyes and emotions to communicate the overwhelming impact of God’s arrival.
Others think the poetry is anchored in a particular remembered act of God in history—especially a sea-crossing deliverance—so that the “waters” reacting is poetic, but it is pointing to an event God actually did in and through the waters.
A smaller difference shows up in “your arrows”: some hear intentional targeting (lightning as directed action), while others hear a vivid metaphor for widespread lightning without focusing on “aim.”
Why the disagreement exists
The passage uses highly animated language (“saw,” “writhed,” “voice,” “arrows”), which naturally raises the question of how literal the description is meant to be. Also, the wider context is a remembered story of God’s deeds, and the next lines describe God making a path through the sea, so readers differ on how tightly these storm lines are linked to a specific historical moment.
What this passage clearly contributes
The passage contributes a strong claim about God’s supremacy over the most uncontrollable parts of the world. Sea, sky, and land are all depicted as responding to him, and the storm is narrated as God’s own action and self-expression (“your arrows,” “your thunder-voice”). In the psalm’s flow, this serves the larger purpose of recalling God’s past interventions with overwhelming power as a foundation for hope in the present distress.