Fog In a Frozen Land

frost 2014-1233

There is still open water on the Yukon, but there won’t be for long now that temperatures have fallen well below freezing for good. Fog has been forming over the river and creeping inland. How strange is that?

The air above a river is filled with moisture coming off the churning water. That makes sense, but what is fascinating to me is how this moisture in the air can remain liquid even down to 40 below! This is the delicately balanced phenomena of supercooling. The water that ought to freeze cannot find its release until it encounters something solid to cling to. With so many trees along the river, it always does.

And then, instant crystallization!

Look how directional it is. Can you guess which way to the river? Answer forthcoming.

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