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currently used as a synonym for general air pollution; it was originally created by combining the words smoke and fog.


(1) an ice particle formed by deposition of vapor in the atmosphere (2) a collection of loosely bonded ice crystals deposited from the atmosphere; high density snow (greater than 550 kilograms per cubic meter; 34 pounds per cubic foot) is called firn if it is older than one year.


snow barchan

horseshoe-shaped snowdrift, with the ends pointing down-wind.

snow board

a specially constructed board used to identify the surface of snow that has been recently covered by snowfall.

snow bridge

an arch formed by snow which has drifted aross a crevasse, forming first a cornice, and ultimately a covering which may completely obscure the opening.

snow core

a sample of snow, either just the freshly fallen snow or the combined old and new snow on the ground, obtained by pushing a cylinder down through the snow layer and extracting it.

snow cover

(1) in general, the accumulation of snow on the ground surface (2) the areal extent of snow-covered ground, usually expressed as percent of total area in a given region.

snow density

the mass of snow per unit volume which is equal to the water content of snow divided by its depth.

snow depth

the combined total depth of both old and new snow on the ground.

snow extent

the total land area covered by some amount of snow; typically reported in square kilometers.

snow flurry

snow that falls for short durations and which often changes in intensity; flurries usually produce little accumulation.

snow grains

precipitation in the form of very small, white opaque ice particles; they resemble snow pellets but are more flattened and elongated, with a diameter less than 1 mm; the solid equivalent of drizzle.

snow layer

a layer of ice crystals with similar size and shape.

snow line

the minimum elevation of snow lying on the ground or glacier surface; the snow line at the end of an ablation season marks a glacier's current equilibrium line.

snow load

the downward force on an object or structure caused by the weight of accumulated snow.

snow patch

relatively small area of snow cover remaining after the main snowmelt period.

snow pellets

precipitation in the form of small, white opaque ice particles; resemble ice grains, but are round (sometimes conical) and about 2-5 mm in diameter.

snow roller

roll-like snow formation, caused by a unique combination of snow, wind, temperature and moisture

snow squall

a brief, but intense fall of snow that greatly reduces visibility and which is often accompanied by strong winds.

snow water equivalent

the water content obtained from melting.

snow worm

an oligochaete worm that lives on temperate glaciers or perennial snow; there are several species that range in color from yellowish-brown to reddish-brown or black; they are usually less than 1 millimeter (0.04 inch) in diameter and average about 3 millimeters (0.1 inch) in length; some feed off red algae.


a bright white glare on the underside of clouds, produced by the reflection of light from a snow-covered surface; snowblink is lighter than ice blink, and much lighter than land sky or water sky.


very intense showers of snow, often of short duration, that greatly restrict visibility and produce periods of rapid snow accumulation.


an accumulation or bank of snow formed when wind blows snow against an obstruction; often considerably thicker than the surrounding snowcover.

snowdrift glacier

a semipermanent mass of firn formed by drifted snow behind obstructions or in the ground; also called a catchment glacier or a drift glacier.


the depth of new snow that has accumulated since the previous day or since the previous observation.


a cluster of ice crystals that falls from a cloud.


melting of the snowcover, and also the period during which melting of the snow cover occurs at the end of the winter.


the total snow and ice on the ground, including both new snow and the previous snow and ice which have not melted.


strong wind with snow.

soil wedge

a wedge-shaped body of soil that is different in structure and texture from the surrounding soil.

solar radiation

the total electromagnetic radiation emitted by the sun.


slow downslope flow of saturated unfrozen earth materials.

solifluction apron

a fan-like deposit at the base of a slope, produced by solifluction.

solifluction features

geomorphological features of varying scale produced by the process of solifluction.

solifluction lobe

an isolated, tongue-shaped solifluction feature, up to 25 meters (27 yards) wide and 150 meters (164 yards) or more long; formed by more rapid solifluction on certain sections of a slope showing variations in gradient.