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 is much more benign. Sleet forms when precipitation starts falling out of the clouds as snow, but encounters a warm layer of air (above freezing) on the way down. The snow melts into rain, but then the rain falls into a colder layer of air near the ground (below freezing). The rain freezes back into ice pellets.