Frozen precipitation in the form of white or translucent ice crystals in complex branched hexagonal form. It most often falls from stratiform clouds, but can fall as snow showers from cumuliform ones. It usually appears clustered into snowflakes. It is reported as "SN" in an observation and on the METAR.
SNOW
Meaning of SNOW in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012