Accretion (meteorology) Accretion (meteorology) Accretion is defined as the gradual collection of something over time. In meteorology or atmospheric science it is the process of accumulation of frozen water as precipitation over time as it descends through the atmosphere, in particular when an ice crystal or snowflake hits a supercooled liquid droplet, which then freeze together, increasing the size of the water particle. The collection of these particles eventually forms snow or hail in clouds and depending on lower atmosphere temperatures may become rain, sleet, or graupel. Accretion is the basis for cloud formation and can also be seen as water accumulates
Snow dance in a row. All of these superstitions are to help influence the temperature to drop and for snow to fall. The Snow Dance, which is meant to summon snow, contrasts the Native American tradition of ushering in rain through what is called the rain dance. Although the Snow Dance is typically performed to invite a type of weather appreciated mainly for its beauty and the fun to be had in it, the success and failure of the rain dance is a matter of survival. Due to prolonged periods of drought in the southwestern United States, the tradition formed as an