Studies of the acoustic properties of this phenomenon have shown that loud 
Studies of the acoustic properties of this phenomenon have shown that loud sounds, such as that of a pistol firing, can be used to measure this phenomenon, and the Lake-effect kind of this phenomenon occurs when cold winds move across long expanses of warmer lake water. Photokeratitis, or blindness caused by this phenomenon, is due to the fact that it can (*) reflect 90% or more of ultraviolet radiation, which explains why Inuits wear special goggles. This meteorological phenomenon occurs when tiny, supercooled cloud droplets freeze into six-armed crystals, no two of which are the same. For ten points, name this type of powdery winter precipitation.
Studies of the acoustic properties of this phenomenon have shown that loud sounds, such as that of a pistol firing, can be used to measure this phenomenon, and the Lake-effect kind of this phenomenon occurs when cold winds move across long expanses of warmer lake water.
{Snow} (accept synonyms like {snowfall}, but do not accept sleet, hail, or any other type of precipitation)