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its common to think of whiteouts as loss of all visibility due to blowing snow for example helicopters can create their own local zone of whiteout caused by downwash in a hover keeping hover time to a minimum will alleviate this situation yet ironically loss of visual contact can occur in clear air when a featureless expanse of a snow-covered landscape blends into the horizon there are many visual clues in the landscape to assist in discerning objects in judging distances shadows glare contrasts in color and clarity in distant objects are all used when flying in visual flight conditions but a flat featureless terrain such as a lake covered in snow in combination with a low ceiling or diffused light can remove these clues these conditions can lure pilots into relying on some inadequate visual references like a dark line in the distance while paying little or no attention to the cockpit instruments the horizon starts to blend in with the terrain disorientation sets in height perception