white·out 
/ˈwaɪtˌaʊt/ noun
plural white·outs /ˈwaɪtˌaʊt/ noun [count] : a type of snowstorm in which blowing or falling snow and clouds make it very difficult to see
▪ We got caught in a whiteout. ▪ whiteout conditions — compare blackout
▪ We got caught in a whiteout. ▪ whiteout conditions — compare blackout
