The cold weather is coming fast and that means snow and ice and doicey weather conditions. Thanks to apps, tablets and the Web, you never again need to wonder what its going to be like out there. Here’s a helpful roundup of winter weather apps. When bad weather threatens we want to know when and where it will start. And that’s where the new Forecast.io website comes in. It accesses the radar data available from the U.S. government and predicts rainfall and snow for your exact area by the hour. The iPhone app is called Dark Sky. It costs $3.99. The Andoid app is Arcus Weather. I really like the…