Basics

Water Sky and Ice Blink

Aurora Borealis Halos Coronas & Anticoronas Water Sky & Ice Blink Superior Mirages Optical Haze

Water sky refers to the dark appearance of the underside of a cloud layer when it is over a surface of open water.

Ice blink refers to a white glare seen on the underside of low clouds indicating the presence of ice which may be beyond the range of vision.

When other means of reconnaissance are not available, water sky and ice blink can assist travelers in navigating the ice of the polar seas, since they give a rough idea of ice conditions at a distance.

Example of Water Sky (larger image)	Example of Ice Blink (larger image)