29:10 The present storm reminded David of the inundation of the whole world in Noah's day. The Hebrew word for flood here occurs elsewhere in the Old Testament only in Genesis 6-11. As Yahweh ruled over His creation then, so He did in David's day, and so He does forever. Thunderstorms reminded the psalmist of this truth.
29:11 The same power Yahweh employs in storms is available to His people. As He can cause a storm to subside, so He can bring peace into our lives (cf. Mark 4:37-39). Thus the Lord is not just transcendent over all and able to control the forces of nature. He is also a resource for those to whom He has committed Himself with covenant promises.
Believers should see in nature the attributes of God and glorify Him for His mighty power (cf. 19:1-6). We should also remember that His power is a resource for us. The God of creation is also the God who saves His people.