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Blowing snow could prompt power outages and snarl travel across a swath of the nation's northern tier, and it's so cold in the South that iguanas could start falling from trees in Florida as waves ...
But lake-effect snow can happen anywhere there is a large amount of relatively warm water that can collide with cold air. "Lake-effect snow sometimes falls more than 100 miles downwind of the ...
The West will deal with rain on the first day of winter, the East and Great Lakes will get snow and cold, with very cold wind chills in the Northeast. Weird winter weather: Cold and snow to the ...
Lake-effect snow is produced as cold winds blow clouds over warm waters. Some key elements are required to form lake-effect precipitation and which determine its characteristics: instability, fetch, wind shear, upstream moisture, upwind lakes, synoptic (large)-scale forcing, orography/topography, and snow or ice cover.
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
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.
Those factors include the depth of the warm layer from the surface into the snow-producing cloud as well as the amount of ice in the snow-producing cloud, the National Weather Service said.
Atmospheric instability is a condition where the Earth's atmosphere is considered to be unstable and as a result local weather is highly variable through distance and time. [ clarification needed ] [ 1 ] Atmospheric instability encourages vertical motion, which is directly correlated to different types of weather systems and their severity.