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.
All three involve precipitation in the clouds, but each requires just the right set of circumstances to occur. One difference between sleet and hail is the time of year in which each occurs. Typically, hail is most often a summer occurrence, while sleet occurs mostly in winter. Youâre much more likely to see hail in warm and oppressive weather where a sudden thunderstorm occurs.
Sleet forms when a raindrop or a snowflake partially melts as it falls through a layer of warm air higher in the atmosphere and turns back into ice as it falls through a deep layer of cold air at the surface.This deep layer of sub-freezing air is usually 3,000 to 4,000 feet thick.s the rain falls, it passes through a very cold, but shallow layer of cold air at the surface and once it hits the ground, trees, cars or other items it freezes and forms a coating or glaze over the surfaces. It is important to note that freezing rain is in liquid form until it strikes a cold surface.