the dark appearance of the underside of a cloud layer when it is over a surface of open water
Water sky and ice blink can assist travelers in navigating the ice of polar areas.
An odd purplish-blue light upon it was reflected to the skies, resembling to some extent a water sky.
Without a well-defined "water sky" it would have been foolish to have entered.
No "water sky" showed as a distant beacon; over all was reflected the pitiless, white glare of the ice.
Patches of "water sky" were visible in two places in the far distance.
Towards the westward, on the 25th of July, all was water, and a water sky.
Behind it was a continuous ice-blink and on our left, to the north, a deep blue "water sky."
Beyond was a water sky, and to the north the sea was entirely free of ice.
The winds were very high for the ensuing two days, and on the 17th the horizon was clearer and more "water sky" was visible.