Saar (H5591) means a storm, tempest, or whirlwind. Both as a noun and a verb (to sweep away in a storm), it depicts violent, overwhelming force — whether of nature or divine judgment and theophany.
God answered Job out of the whirlwind (saarah, H5591), overpowering all human argument with the weight of divine majesty (Job 38:1). Elijah was taken up in a whirlwind (2 Kings 2:11). The storm is a divine chariot, a vehicle of theophany and judgment. Yet the same God who rides the storm whispers to Elijah in the still small voice (1 Kings 19), showing that divine power wears both faces.