In our experience Dark Sky has been pretty accurate.
Although we discovered the app some time ago, we will admit we were intimidated by the price. $3.99 is steep for an app. But in this case, it's worth the price
Tap to open. We really like the icon.
This is the first page you see when you open the app. Tap radar at the top to see a full map with a Doppler radar. The app obviously needs your location so tap the bottom left arrow. The graph at the top shows the intensity of the rain that may be coming.