Yahoo! Weather via RSS

You can now get the local Yahoo! weather report via RSS. Like many of the RSS Weather sites (e.g. RSS Weather) and RSS Calendars, the problem with Yahoo is when to signal an update. In the case of Yahoo! Weather, it updates every time the underlying condition report changes - which seems to be about once an hour. Having this be marked new in the aggregator essentially every time the feed is fetched is not ideal. It would be better if it changed only when the forecast or the current conditions changed significantly (i.e. it's gone from sunny to rainy). Yahoo has added a bunch of interesting namespaced Weather extensions for things like units, location and the underlying weather which is interesting - apparently the Yahoo! Widget (aka Konfabulator) for Weather uses the same feed. I added an entry for the Weather extensions in the RSS Extensions Registry. If I were Yahoo, I would also publish the weekly forecast as an iCal feed so that I could integrate it into my calendar.