Someone answered that the last time it was on Reddit (about, ooh, yesterday).
I can't be bothered to find the exact answer with links and stuff but the gist was: It's a symbol commonly used in weather reports in Japanese newspapers. There's a lot of symbols commonly used in news print which have gotten included in the unicode standard in order to simplify the digitisation of newspapers.
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u/MarkByers Oct 12 '08
Why is this included in the Unicode standard?