Weather over RSS is something I experimented with a bunch, but I got sick of writing scrapers for the data. Every now and then someone (including the NWS) will launch weather feeds, and I’ll hope the problem has been solved, and I can cross it off my todo list. But alas it never is.
Now Yahoo Weather has feeds, and they’re the best I’ve seen in that the data is actually structured enough to re-use. Problem solved.