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Snow and Ice

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28 facts:

A Blizzard
   is   
A Long-lasting Snow Storm With High Winds
Winds of over 40 km/h and visibility of up to 1 km
Blowing Snow
   is   
Snow Particles Raised by the Wind
To moderate or great heights above the ground; the horizontal visibility at eye level is generally very poor.
A Cornice
   is   
An Overhanging Edge of Snow on a Ridge of a Mountain
Extremely dangerous
Corn Snow
   is   
Snow With Large, Corn Kernel Size Granules
Usually found in the Spring.
The Crust
   is   
A Hard Snow Surface Lying Upon a Softer Layer
May be formed by sun, rain or wind, and is described as breakable crust or unbreakable crust, depending upon whether it wil break under the weight of a turning skier.
Dendrite
   is   
Hexagonal Ice Crystals With Complex and Often Fernlike Branches
Firn
   is   
Névé Snow That Survives a Full Season
Firn becomes glacial ice
Frost Heave
   is   
A Freeze-thaw Action Allowing Mass Movement Down Slope
Graupel
   is   
Precipitation Formed when Freezing Fog Condenses on a Snowflake
Known as snow pellets
Hard Pack
   is   
Firmly Packed Natural Snow
By repeated grooming or continuous wind exposure. Often snow that has never melted or re-crystallised.
Hoar Frost
   is   
White Ice Crystals Formed when Air is Moist and Surfaces Are Cold
Lake Effect Snow
   is   
Snow Produced when Cold Winds Move Across Warmer Lake Water
New over
   is   
An Accumulation of Snow over an Existing Surface
E.g. "New over packed powder" or "New over machine groomed".
Névé
   is   
Young, Granular Snow That Has Been Partially Melted, Refrozen and Compacted
Packing Snow
   is   
Snow at or Near the Melting Point
Good for making snowballs and snowmen
Penitentes
   is   
Tall Blades of Snow Found at High Altitudes
Perennial Snow
   is   
Snow That Persists on the Ground Year After Year
Permafrost
   is   
Ground That Stays at or Below Freezing for Two or More Years
Geological term
A Polycrystal
   is   
A Snowflake Composed of Many Individual Ice Crystals
Powder
   is   
New, Loose, Fluffy Dry Snow
Has not been compacted by skier traffic or grooming.
Rime Ice
   is   
A White Ice That Forms when Water Droplets in Fog Freeze to Surfaces
Similar to hoar frost
Seasonal Snow
   is   
Snow That Accumulates in One Season
Slush
   is   
Snow Which Partially Melts Upon Reaching the Ground
A Snowburst
   is   
A Short Period of Heavy Snowfall
First used to describe a New York storm that dropped 6 ft of snow in 24 hours (1958)
A Snow Flurry
   is   
Snow That Falls for Short Durations and Which Often Changes in Intensity
Flurries usually produce little accumulation.
A Snow Layer
   is   
A Layer of Ice Crystals With Similar Size and Shape
Watermelon Snow
   is   
Reddish/pink Colored Snow Caused by Algae
Actually smells like watermelons
Wet Snow (wet Pack)
   is   
Snow That Has Become Moist Due to Thaw or Rainfall
Snow with a high moisture content when it fell.


Facts contributed by:


JMK








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