Quite interesting.

I'd be concerned about how this is going to hamper the device. It's processing locally, though it suggested it's through the gpu. It could be a significant drain on battery life. Also, to get accurate weather maps is going to take a lot of data.

Seems like a better approach would be to put the calculation in the cloud or if that's impractical use a sort of crowd cloud by having the calculations be sent back up after they're made on the phone.

Just the animations are being rendered on the device (to save bandwidth). The forecast data is being computed on the server.