Snow is a form of precipitation in the form of crystalline water ice, consisting of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by external pressure. Snowflakes come in a variety of sizes and shapes. Types which fall in the form of a ball due to melting and refreezing, rather than a flake, are known as graupel, ice pellets or snow grains. Snowfall amount and its related liquid equivalent precipitation amount are determined using a variety of different rain gauges.

The process of precipitating snow is called snowfall. Snowfall tends to form within regions of upward motion of air around a type of low-pressure system known as an extratropical cyclone. Snow can fall poleward of these systems' associated warm fronts and within their comma head precipitation patterns (called such due to the comma-like shape of the cloud and precipitation pattern around the poleward and west sides of extratropical cyclones). Where relatively warm water bodies are present, for example due to water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effect snowfall can be locally heavy. Thundersnow is possible within a cyclone's comma head and within lake effect precipitation bands. In mountainous areas, heavy snow is possible where upslope flow is maximized within windward sides of the terrain at elevation, if the atmosphere is cold enough.

Read more about SnowForms, Cause, Snowflakes, Types, Density, Acoustic Properties, Snowfall Measurement, Records, Snow Blindness, Relation To River Flow, Effects On Human Society, Damage, Design of Structures Considering Snow Load, Extraterrestrial Snow

Other articles related to "snow":

Extraterrestrial Snow
... Very light snow is known to occur at high latitudes on Mars ... A "snow" of hydrocarbons is also theorized to occur on Saturn's moon Titan ... on Venus, there is a phenomenon which is quite similar to snow ...
Rose Red
... Rose Red (German Rosenrot), or Rose-Red, is a character in the fairy tale Snow-White and Rose-Red, recorded by the Brothers Grimm ... She is the sister of Snow-White, not to be confused with Snow White ... is portrayed as the more rambunctious of the two devoted sisters, associated with the summer as Snow-White is with the winter ...
Winter Weather Advisory
... system produces a combination of winter weather (snow, freezing rain, or sleet) that presents a hazard, but does not meet warning criteria ... For example, any measurable snow will constitute the advisory in Florida, while up to 5 inches will do so in New England ... to the 2008-09 winter storm season, there was the Snow Advisory, specific for when snow was the only hazard expected in the advised area, the Sleet Advisory, specific for when sleet was ...
Peter Snow - Personal Life
... Snow has been married twice, and has six children from three relationships ... citizen Matthieu, was born before his first marriage, although Snow was not aware of his exisence until he was an adult ... Snow was appointed CBE (Commander of the Order of the British Empire) for his services to broadcasting in the 2006 Queen's New Year's Honours List ...
Snow (disambiguation) - Other Uses
... SNOW, a stream cipher Snow (dessert), two types of dessert Snow (ship), a type of two-masted sailing vessel Snow (visual novel), a 2003 Japanese adult visual novel Snow beer ... Snow College, Ephraim, Utah, U.S ... John Snow College, a college of the University of Durham Cocaine or snow, a crystalline tropane alkaloid obtained from the leaves of the coca plant Noise (vide ...

Famous quotes containing the word snow:

    These be
    Three silent things:
    The falling snow ... the hour
    Before the dawn ... the mouth of one
    Just dead.
    Adelaide Crapsey (1878–1914)

    Old age is
    a flight of small
    cheeping birds
    bare trees
    above a snow glaze.
    William Carlos Williams (1883–1963)

    You have to make more noise than anybody else, you have to make yourself more obtrusive than anybody else, you have to fill all the papers more than anybody else, in fact you have to be there all the time and see that they do not snow you under, if you are really going to get your reform realized.
    Emmeline Pankhurst (1858–1928)