There’s a free app that could save your life — well, that’s a worst-case scenario, but next winter, or maybe sooner if you live in tornado country, you may be pretty glad you’ve got it. MyRadar, from ACME AtronOmatic, shows an animated radar image of the weather in your area in real time. It’s available for iPhone, iPad, and now Android. The iPhone and iPad versions have an add-on that alerts you to severe weather coming up. Find it at Google Play, the iTunes App store, and the Windows Phone Marketplace.