- Apr 21, 2010
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When it gets really, really cold, it doesn't snow. Snowing is precipitation. It requires evaporated moisture. Until recently, Antarctica was one of the driest deserts on the planet.
Antarctica has always (well, last 50 million years or so..) been one of the driest places on Earth. Water vapor residence time is 9 days so the meme that increased temps lead to more snow is hog wash. By the time the temps drop to the level where snow can form, the water vapor increase from a local warming has already dissipated. Nope. If it's warm you get rain, if it gets cold enough you get snow.
There is no such thing as "too cold to snow". What you can get is it being too dynamically stable to create snow. It takes three factors to create snow, a temp gradient that allows snow to reach the ground, saturated air, and enough lift to raise the saturated air to create the snow that will then fall back to Earth.
When it is extremely cold the dynamic lift is not present BECAUSE OF THE COLD!