Fire, and hail - Fire, when accompanied by hail; that is, the lightning. See Psalms 18:12.
Snow, and vapors - Snow and clouds. It was not unnatural that these should be combined, or suggested together to the mind.
Stormy wind - The storm; the tempest.
Fulfilling his word - Obeying his command; accomplishing his purpose. Let the storm-wind, which seems to be so little under any control, speak his praise by showing how obedient it is to his will, and how exactly it carries out his designs. Its perfect submission to his laws - the exactness with which, though apparently so fierce, raging, and lawless, it carries out his plans, and pauses when he commands it - is in fact an act of praise or homage, as it proclaims his majesty, his supremacy, and his power. On the sentiment here expressed, compare Psalms 107:29, note; Psalms 89:9, note.