Features I would like to see in a weather site:
1. More historical data. What was the weather on any given day the data exists?
2. Weather along a route. Kind of a combination of Google Maps and weather. Give a starting time and location, and it shows you the weather at about when you'll head through a city every 60 miles or so.
3. A different way of visualizing data. I'd like to have ad-hoc queries & reports against historical and forecasted weather. My random one is being able to specify a line on a map, then left to right show the temperature across a period (either across a day, or highs across a year). This would be cool to see if one area has a shorter period where it's at its high temperature, or which states have more excessive temperatures, and how that varies by region.
Tomorrow's the 12 hour trip to Pittsburgh