Light snow aloft

An upper-level impulse is producing an area of very light snow across western and middle Tennessee and northern Alabama, and it is moving south. However, the air is do dry that most of the snow is sublimating (going straight from snow to water vapor) before reaching the ground.

Interestingly, as the snow falls mainly between 4,000 and 8,000 feet and dries up, it is adding some humidity to the air, and the snow is reaching a little closer to the ground with time. Here is a time-height section of radar return from the vertically-pointing MIPS wind profiler at UAH. Notice how the snow was drying up around 5,000 feet at 2 pm, and is now reaching as far as 3,500 feet.

With light snow all the way back to Kentucky, the atmosphere may moisten up enough to allow a few flakes to reach the ground, especially over north Alabama, this evening. But, no accumulations are expected.

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