It looks like RSS Feeds from the National Weather Service are
available--just and your NWS station to the end of the URL. Here's
the one for Springfield, MO where I live and it returns the current
observations from the airport.

http://weather.gov/data/current_obs/KSGF.rss

or San Franciso, CA:

http://weather.gov/data/current_obs/KSFO.rss

Can't find any documentation, though. Dave, it looks like they need
your help in getting the word out.

--
Steve Kirks
Product Manager, Radio UserLand
http://steve.userland.com/