The Lord sitteth upon the flood - God is enthroned upon the flood, or presides over it. The obvious meaning is, that God is enthroned upon the storm, or presides over that which produces such consternation. It is not undirected; it is not the result of chance or fate; it is not produced by mere physical laws; it is not without restraint - without a ruler - for Yahweh presides over all, and all this may be regarded as his throne. Compare the notes at Psalms 18:7-11. See also Psalms 97:2. The word used here is commonly applied to the deluge in the time of Noah, but there would be an obvious unfitness in supposing here that the mind of the psalmist referred to that, or that the course of thought would be directed to that, and it is most natural, therefore, to suppose that the reference is to the floods above - the vast reservoirs of waters in the clouds, pouring down, amidst the fury of the tempest, floods of rain upon the earth.
The Lord sitteth King for ever - This is an appropriate close of the entire description; this is a thought which tends to make the mind calm and confiding when the winds howl and the thunder rolls; this accords with the leading purpose of the psalm - the call upon the sons of the mighty Psalms 29:1 to ascribe strength and glory to God. From all the terrors of the storm; from all that is fearful, on the waters, in the forests, on the hills, when it would seem as if everything would be swept away - the mind turns calmly to the thought that God is enthroned upon the clouds; that He presides over all that produces this widespread alarm and commotion, and that He will reign forever and ever.