Why does crystal ice (Bergeron) tend to freeze at temperatures close to freezing? Do they reach -15°C?
Touch the liquid drops to the ice and stick together. This process of ice crystals that collide with them become larger, supercharged cloud droplets is called accretion. The ice material of these forms is called granules (or snowballs). As the boar falls, small ice particles may fracture or shatter upon impact with the cloud droplets. These clumps may grow to become new graupels, which, in turn, may produce more compact ones. In colder clouds, the fine ice crystal may collide with other crystals and break into smaller ice particles, or grains, which bring hundreds of supercooled droplets into contact. In both cases, a chain reaction may occur, producing many ice crystals. As the ice crystals fall, they may collide with one another. The process of ice crystals that are colliding, stuck together is called aggregation. * The final product of this gathering together with the ice crystal is a snowflake. If the sleet melts before it reaches the ground, it continues to fall as a raindrop. Much of the rain in the mid- and high latitudes—even in summer—actually begins as snow. For ice crystals large enough to produce precipitation, there must be several times more water droplets than ice crystals. Generally, the ratio of ice crystals to water droplets must be on the order of 1:100,000 to 1:1,000,000. . When there are very small ice crystals in the cloud, each crystal expands and collapses
Outside the cloud, the majority of the cloud passed (no effect). Because there are very few ice crystals, there is very little precipitation. If, on the other hand, there are too many ice crystals (such as an equal amount of crystals and droplets), then each ice crystal receives the mass of one drop. This creates a cloud.
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