Blowing snow is
snow
Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes.
It consists of frozen crystalline water throughou ...
lifted from the surface by the wind, at eye level () or more,
that will reduce visibility. Blowing snow can come from falling snow or snow that already accumulated on the ground but is picked up and blown about by strong winds. It is one of the classic requirements for a
blizzard
A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow is not falling ...
. Its
METAR
METAR is a format for reporting weather information. A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.
Raw METAR is the most common fo ...
code is BLSN. If the snow remains below , it will be called drifting snow (METAR code DRSN). The snow which is being blown about may deposit as
snowdrift
A snowdrift is a deposit of snow sculpted by wind into a mound during a snowstorm. Snowdrifts resemble sand dunes and are formed in a similar manner, namely, by wind moving light snow and depositing it when the wind has virtually stopped, us ...
s.
Formation
There are 3 ways of producing blowing snow:
# In
horizontal advection
Horizontal may refer to:
*Horizontal plane, in astronomy, geography, geometry and other sciences and contexts
*Horizontal coordinate system, in astronomy
* Horizontalism, in monetary circuit theory
* Horizontalism, in sociology
*Horizontal market ...
conditions, the winds blow across the surface of the earth with very little if any large-scale upward motion.
# In
convection
Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy). When the cause of the c ...
conditions, the winds exhibit large-scale upward motion lifting the snow into the atmosphere creating drifting waves of snow up to in height.
# In
thermal-mechanical mixing conditions, massive convective rolls form in the atmosphere and the blizzard may be observed from space with the blizzards convective rolls creating waves of snow (also known as snow billows)
resembling lake or ocean effect snow bands. The extreme conditions can quickly bury a two-story home and make breathing very difficult if not impossible if caught outdoors.
See also
*
Blizzard
A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow is not falling ...
*
Blowing Snow Advisory
*
Ground blizzard
Ground blizzard refers to a weather condition where loose snow or ice on the ground is lifted and blown by strong winds. This can occur in the absence of precipitation, and can even occur when the sky is clear. This is in contrast to "ordinary" b ...
*
Severe weather terminology (Canada)
*
Snowsquall
A snowsquall, or snow squall, is a sudden moderately heavy snowfall with blowing snow and strong, gusty surface winds. It is often referred to as a whiteout and is similar to a blizzard but is localized in time or in location and snow accumul ...
*
Whiteout (weather)
Whiteout, white-out, or milky weather is a weather condition in which the contours and landmarks in a snow-covered zone become almost indistinguishable. It could be also applied when visibility and contours are greatly reduced by sand. The hori ...
Notes
Snow or ice weather phenomena
Fog
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