Science / Weather / Snow Pellets: Frozen precipitation in the form of white, round or conical opaque grains of ice. Their diameter ranges from 0.08 to 0.2 inch (2 to 5 mm). They are easily crushed and generally break up after rebounding from a hard surface, unlike hail. Sometimes it is called small or soft hail. It is reported as 'GS' in an observation and on the METAR.
Science / Weather / Snow Roller: The product of moist, cohesive snow that when initiated by wind rolls across the landscape, gathering snow until it can no longer move. It is shaped like a rolled sleeping bag, some reaching four feet MORE
Science / Weather / Snow Shower: Frozen precipitation in the form of snow, characterized by its sudden beginning and ending. It is reported as 'SHSN' in an observation and on the METAR. MORE