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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.
Snow Light, Snow Bright On Christmas
It’s the first storm of the season…..,
And it really sets the mood……,
Cause the spirit of the holiday….,
Comes from gifts, snow and food….,
And it looks like a good one…..,
That I hope you just won’t miss…..,
Snow Light, Snow Bright On Christmas….,
Yes, Snow Light, Snow Bright On Christmas….! ! !
Thnaks for viewing.2012©Sonali T. Gangane
November 29th, 2012
Viewed 168 Times - Last Visitor from Rishikesh, 39 - India on 12/24/2014 at 8:00 PM
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