katabatic wind: Air that becomes so dense through cooling that gravity pulls it downhill, often at great speed
I just enjoy the image of air being so dense that it gets thrown down hills. If I could draw, there would be several prints involving the personifications of Gravity and Katabatic Wind. The latter would, of course, start as Air or some such, attaining its full title only upon being wrestled and thrown down a hill. The descent begins ponderously, but gains speed (at a rate of 9.8m per second per second, adjusted for the slope) like a child and a tiger in a little red wagon, until at length the party bowls through a busy seaside village and plunges at last–after hanging sickeningly in the air for a long moment–into the sea.
This post brought to you by the weather. And the letters chi and ro and the number e.