I've noticed this with a lot of weather apps, the live tile or the lock screen does not update until you go into the app which is kind of pointless. Accuweather does work sometimes, Bing rarely, Amazing weather HD which shows the time since last update rarely works at all. On android when you unlock it updates the the weather among other things, this is not happening on Windows phone, I have to go into the app. Now my news apps such as NBC news, Weave reader etc are all fine, its just the damn weather and its really annoying.