WU makes those numbers up, just like it tweaks some people's barometer readings. I was feeding numbers from a DIY UV sensor to them, and their display differed from what I sent them most of the time. Even more funny, I have a test WU station running with only a thermometer and humidity probe, and they are making up UV figures for that station that don't match the made-up figures for the first station in the same exact location.....
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