Snow squall

[2] Whiteout conditions will affect narrow corridors from shores to inland areas aligned along the prevailing wind direction.

[5] Extremely cold air over still warm water in early winter can even produce thundersnow, snow showers accompanied by lightning and thunder.

The strong convection that develops has enough moisture to produce whiteout conditions at places which line passes over as the wind causes intense blowing snow.

[3] This type of snow squall generally lasts less than 30 minutes at any point along its path but the motion of the line can cover large distances.

The presence of surface moisture from bodies of water or preexisting liquid precipitation is also a significant contributing factor helping to raise the dew point temperature and saturate the boundary layer.

In cases where there is a large amount of vertical growth and mixing the squall may develop embedded cumulonimbus clouds resulting in lightning and thunder which is dubbed thundersnow.