downfall, precipitation - the falling to earth of any form of water (rain or snow or hail or sleet or mist)

snow flurry, flurry - a light brief snowfall and gust of wind (or something resembling that); "he had to close the window against the flurries"; "there was a flurry of chicken feathers"

whiteout - an arctic atmospheric condition with clouds over snow produce a uniform whiteness and objects are difficult to see; occurs when the light reflected off the snow equals the light coming through the clouds

flake, snowflake - a crystal of snow