hydrometeorology

noun

study of water in the atmosphere

Wiktionary

noun

Etymology: Etymology tree Proto-Indo-European *wed- Proto-Indo-European *-r̥ Proto-Indo-European *wódr̥ Proto-Hellenic *údōr Ancient Greek ῡ̆̔́δωρ (hū̆́dōr) Ancient Greek ῠ̔δρο- (hŭdro-)der. English hydro- English meteorology English hydrometeorology From hydro- + meteorology.

The branch of meteorology that studies the occurrence, movement and changes of state of water in the atmosphere.