DCHP-1 Online
gray-out 
n. North See quote.
See also: white-out
- 1965 When the sun is low in the sky and there is a low overcast, the bane of the northern traveller occurs--the dreaded grey-out. The muted greys of the snow blend into the dull greys of the overhanging cloud, obscuring the horizon and baffling perspective. A hump in the snow may look like a distant hill, whereas if may be merely a snow-covered stone a few yards away. Small hummocks and hollows cause walkers to stumble and fall, and airplane pilots may make serious errors in judgement of distance.
- 1965 When the sun is low in the sky and there is a low overcast, the bane of the northern traveller occurs--the dreaded grey-out. The muted greys of the snow blend into the dull greys of the overhanging cloud, obscuring the horizon and baffling perspective. A hump in the snow may look like a distant hill, whereas if may be merely a snow-covered stone a few yards away. Small hummocks and hollows cause walkers to stumble and fall, and airplane pilots may make serious errors in judgement of distance.