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.
Rain develops from cloud droplets or ice crystals; if it starts as crystals, the rain first takes the form of snowflakes, but they melt when they enter warmer layers of air, changing into raindrops. In thunderstorms that have a central updraft capable of hosting both rain and snow, snowflakes fall, but the liquid water freezes together with them, making ice pellets that keep growing as they add more water droplets.