Commentaries:
Jamieson, Fausset, and Brown
How the thunderclouds are dispersed, or else employed by God, either for correction or mercy.
by watering—by loading it with water.
wearieth—burdeneth it, so that it falls in rain; thus "wearieth" answers to the parallel "scattereth" (compare, see on Job 37:9); a clear sky resulting alike from both.
bright cloud—literally, "cloud of his light," that is, of His lightning. UMBREIT for "watering," etc., translates; "Brightness drives away the clouds, His light scattereth the thick clouds"; the parallelism is thus good, but the Hebrew hardly sanctions it.
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