God weighs the atmosphere
"For he looketh to the ends of the earth, and seeth under the whole heaven; To make the weight for the winds; and he weigheth the waters by measure." (Job 28:24-25)
Clouds are composed of liquid drops of water, not water vapor, and water is heavier than air, so how are they "balanced" in the sky? "For he maketh small the drops of water: they pour down rain according to the vapour thereof: Which the clouds do drop and distill upon man abundantly" (Job 36:27-28).
Eventually, however, the droplets coalesce to form larger drops which overcome these updrafts and fall as rain. "By watering he wearieth the thick cloud" (Job 37:11). The coalescence is probably triggered electrically in the clouds themselves, "when he made a decree for the rain, and a way for the lightning of the thunder" (Job 28:26).