10-day forecasts and hyper-local alerts are great, but when severe weather is headed your way, you want as much information as possible. Storm is ready to provide it. Built by the pros at Weather Underground, it boasts the highest-resolution radar imagery available on the iPhone, with interactive animations for both past and future data. It also offers advanced storm tracking capabilities, and real-time weather alerts powered by a network of over 100,000 personal weather stations. Plus, it's free, so even if you're reluctant to give up your Dark Sky, there's little reason not to give it a try.