Weather app that knows where it is?

[wackychimp]

I've tried a few weather apps but haven't found one with this feature.

I like that when I get off the plane that my phone knows that I'm in a new time zone and changes the clock. I assume that it talks to the cell towers.

Is there a weather app that will update similarly? So when I'm in Miami I automatically get Miami's weather and when I'm in New York, I get New York's? Sure I can change my settings, it just seems like this would be a handly feature.

Thanks for any adivce or links.