I suggest that we're able to see weather outside when we're in the first room of a building with an open window. There doesn't have to be a notification; just a blurb of text on the Location page.
Something like this:
![Image](http://i265.photobucket.com/albums/ii226/snickiedude/Cantr/cantrweathersuggestion.png)
"Windy" would only show up if outside it said "fast wind" or anything stronger than that. Anything less and nothing would show up.