What is Snow?
Most people perceive snow simply as frozen water. Delving in a little deeper, snow is actually a form of precipitation in the form of ice crystals. These ice crystals are hexagonal prisms that form when snow freezes up. Prisms are formed due to the molecular structure of water. As these ice crystals are formed, they come down in one of the following forms:
* Snow crystals -- Individual, single ice crystals, often with six-fold symmetrical shapes. These grow directly from condensing water vapor in the air, usually around a nucleus of dust or some other foreign material. Typical sizes range from microscopic to at most a few millimeters in diameter.
* Snowflakes -- Collections of snow crystals, loosely bound together into a puff-ball. These can grow to large sizes (up to about 10 cm across in some cases) when the snow is especially wet and sticky. A snowflake consists of up to 100 snow crystals clumped together.
* Rime -- Super cooled tiny water droplets (typically in a fog), that quickly freeze onto whatever they hit. An example of this is the small droplets of rime on large snow crystals.
* Graupel -- Loose collections of frozen water droplets, sometimes called "soft hail."
* Hail -- Large, solid chunks of ice.