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 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.