I like the NOAA weather graph as a useful tool for predicting weather when sailing (we look at weather very closely when racing sailboats because you adjust the rig for the predicted wind strength and because thunderstorms REALLY suck when you're 50 miles offshore and there's no place to hide). It's easy to comprehend, and since a lot of weather services pull from the NOAA data, it's usually a bit more current.
I save links to various locations on my iPhone so I can quickly access the forecast in much more detail than you get from most Apps I've seen. The link below is for Gerald J Ford Stadium in the heart of beautiful University Park. Hope to see everyone at the game tomorrow –- rain or shine!
http://forecast.weather.gov/MapClick.ph ... =graphical