Digital Atmosphere is a powerful weather forecasting program that allows you to create detailed maps of real-time weather for anywhere in the world. It makes extensive use of techniques and algorithms that are comparable and in some cases superior to the National Weather Service's multimillion-dollar computers. It runs on any Windows system, and uses free data from government and university sources on the Internet. 
 
http://www.weathergraphics.com/da/

This is an excellent program for storm chasing, pilots, sailors, or anyone needing the highest quality weather data. It works great on a laptop with a GPS!