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The water vapour forming snow has to reach 0oC to form ice crystals. There is no lower temperture for the snow formation. Interestingly the snow crystals formed are of different shapes as the temperture is lowered and the location of the formation occurs. Six-sided hexagonal crystals are shaped in high clouds, needles or flat six-sided crystals are shaped in middle height clouds and a wide variety of six-sided shapes are formed in low clouds. At colder temperatures the flakes have sharper tips on the sides of the crystals and more branching of the snowflake arms.
Snowflake shapes at various (approximate) formation temperatures are:
-16° C - Thin hexagonal plates
-10° C - Needles
-8° C - Hollow columns
-5°C - Sector plates (hexagons with indentations)
-2°C - Dendrites (lacy hexagonal shapes)
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no snow will fall this month!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
