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From Wikipedia, the free encyclopedia

Blowing snow[1] is snow lifted from the surface by the wind, at eye level (1.8 m or 6 ft) or more,[2] 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. Its METAR code is BLSN. If the snow remains below 1.8 m (6 ft), it will be called drifting snow (METAR code: DRSN). The snow which is being blown about may deposit as snowdrifts.

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Transcription

Formation

Visibility reduced in blowing snow during a ground blizzard

There are 3 ways of producing blowing snow:

  1. In horizontal advection conditions, the winds blow across the surface of the earth with very little if any large-scale upward motion.
  2. In convection conditions, the winds exhibit large-scale upward motion lifting the snow into the atmosphere creating drifting waves of snow up to 500 m (1,600 ft) in height.
  3. 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)[3] 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

Notes

  1. ^ "Blowing snow". Glossary of Meteorology. American Meteorological Society. Retrieved 2007-04-20.
  2. ^ "Blowing Snow - International Cloud Atlas". World Meteorological Organization. 2017.
  3. ^ "Snow billows". CIMSS. Retrieved 2007-04-20.


This page was last edited on 12 February 2024, at 16:51
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