Is there a smart wake up alarm?

I live in St Louis which can see 4 different weather types on a given day. Unless I check my weather everyday, there is nothing to tell me to be prepared for a worse weather day.
Recently, on one of days I woke up with no indication of snow (which was only 2 inches but my city wasn't prepared for it) and was 2 hrs late to work. I wished that my alarm woke me up early based on my local weather.
Is there an app that does something similar to what I'm talking about? My searches were fruitless.
Have you guys been in similar situations?

Confuzzzed said:

Not weather dynamic BUT when you are talking smart alarm, everyone should give Sleep cycle a go! I know it's irrational but it really works! The alarm goes when you are out of REM sleep and you wake up more refreshed even though you may have actually slept less

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Its is a pretty slick app, I never would have imagined such a use of the iPhone's accelerometer, great Idea! Unfortunately though this doesn't gear towards what I'm looking for. Thanks for sharing may be I will give it a try!