Anyone who has taken a road trip has wished for this sort of a tool. A map that tells you what the weather forecast is going to be along your route. One of the great things about this map is that it doesn’t give you the current weather conditions at the location, it gives you the forecast for when you are projected to be at that point in your route.
This is now a feature of the Weather Channel’s Trip Planner. The creators of this excellent tool, Stamen Design, have a short writeup of some of the thinking that went into the trip planner.