Weather Data Question

I have an idea for a weather app. It would conceive of a small square (about 160x160) and in the square you’d have text at the bottom telling you the time and temperature. The animation at the top of the graphic would reflect the weather. (ie. Snowing if it was snowy, raining if it was rainy, sunny if it was clear, etc.)

Any ideas as to where I’d get data to update the Flash app?:q:

Any suggestions would be very appreciated.