Dark Sky

Price: $3.99

The Dark Sky weather app can tell you at a glance exactly when it will rain (or snow) up to an hour in advance. You can also explore animated weather maps, both forward in time or back.

Using GPS, Dark Sky is able to create forecasts for your precise location. And because Dark Sky focuses on the next hour, the app is able to give you minute-to-minute predictions. This same predictions technology also allows for smooth radar animation that lets you see the actual path of the storm: how it moved in the past, and where it’s going in the future.

You can also receive alerts before it starts raining at your exact location. Even if you haven't opened the app in days.

The app currently supports the United States, including Hawaii, Alaska, and Puerto Rico.