Taking a road trip soon? You may already be using Google Maps to get directions, but starting today, the service may help you decide what to pack, too. My Post colleague Jason Samenow reported that Google has added a weather layer to Maps, giving users the option to check the current weather, cloud patterns and forecasts for the next four days. To use the new tool, hover over the widget in the upper-right corner of Google Maps and chose the to make the weather layer it visible.