The east wind blows from the desert, drying up crops and seas (Genesis 41:6, 23, 27; Jeremiah 4:11; Jonah 4:8; Exodus 14:21; Isaiah 11:15). It is not like the heavy rain that causes floods.
Helpful rain quenches a barren land (Psalms 104:10–11; 107:35; Isaiah 35:7; 58:11). This contrasts with both hot winds and flooding rains (Job 38:24, 25).