#WxGeekSpeak: Snow rollers

Every week, the blog introduces you to a technical term from the American Meteorology Society’s “Glossary of Meteorology”. Welcome to #WxGeekSpeak!

Not only is snow roller an official meteorological term, it’s entirely possible to see them on Mount Lemmon. Jeff explains why in this week’s edition of #WxGeekSpeak.

Full definition of snow roller: A rolled-up, cylindrical mass of snow, rather common in mountainous or hilly regions.

It occurs when snow, moist enough to be cohesive, is picked up by wind blowing down a slope and rolled onward and downward until it either becomes too large or the ground levels off too much for the wind to propel it farther. Snow rollers vary in size from very small cylinders to some as large as 1.5 m long and more than 2 m in circumference.

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