Alex Lindsay's pick on MacBreak Weekly episode 387 is Dark Sky; a beautiful and well-designed weather app. Dark Sky uses your exact location to predict when it will rain or snow, right down to the minute. It uses the information from forecast.io, and has all of the information you'd possibly need about the current conditions and forecast.
Dark Sky shows the wind speed and direction, humidity, pressure, visibility, and more. The forecast is easy to read, and it gives you a detailed breakdown of the next 24 hours. The app also has animated maps to show you exactly where the storms are, and you can easily scrub back and forth in time.
Dark Sky is a universal app for iPhone and iPad, and is $3.99 in the app store.
Check out MacBreak Weekly episode 387 for Alex Lindsay's explanation of Dark Sky.