Hmmm ...
Well, you can sign up for an account at the weather channel (www.weather.com) and get a magnet to fit in your site. SkyPortal uses something very similar, except they got their's from www.wunderground.com. I'm not sure if they use a feed and then interpretted it to like what they have or not. I went to wunderground, but couldn't find the same thing there as what weather.com has. Maybe if I signed up for an account like I did at weather.com I'd see it as an option.
Ten minutes later ...
Ok, I signed up for an account, but didn't see what I was looking for.
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