Arctic Sea-Smoke:
 
 


This is Arctic sea-smoke billowing from open water and over pancake ice in Burlington (VT) harbor, on Lake Champlain. This stuff forms when very cold air (about -22 F in this case) blows over much warmer water (about 32 F).


Sea smoke blowing past one of the Winter-idled Lake Champlain ferries. Here are a couple more pictures: