Re. the implementation of weather prediction: the api that powers the dark sky iphone app is free for >1000 requests a day: https://developer.forecast.io/ https

Re. the implementation of weather prediction: the api that powers the dark sky iphone app is free for >1000 requests a day: https://developer.forecast.io/ https://developer.forecast.io/ -in sf this kind of data is doubly useful too (weather that changes quickly)