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Snow grains are a form of precipitation characterized as:
- white, opaque grains of ice
- very small <1 mm,
- fairly flat or enlongated,
- unlike Snow pellets they don't bounce or breakup on impact,
- very small amounts fall, mostly from Stratus or Fog,
- Never in the form of a shower.
The METAR code for snow grains is SG.
"Snow grains"