Definition of reservoir. 1 : a place where something is kept in store: such asa : an artificial lake where water is collected and kept in quantity for useb : a part of an apparatus in which a liquid is heldc : supply, store a large reservoir of educated people.
Four types of winter precipitation. While all forms of precipitation start as snow high up in the clouds, there are four primary types that eventually reach the ground: snow, sleet, freezing rain and plain ol' rain. Snow occurs when the atmosphere is cold all the way from the clouds to down here at the surface.
Sleet occurs during a winter storm and is caused by rain falling into a cold layer of air aloft which has to be below freezing. As the raindrops fall through the cold layer of air, they freeze and become small ice pellets. When they hit your car windshield or your windows at home, they can make quite a racket.