I've recently been given Baron Systems' Mobile Threat Net for review and analysis.
Mobile Threat Net is a realtime weather monitoring system that tracks storms and any other pertinent weather data via real-time satellite feed viathe XM radio network. It also incorporates GPS capability so that you can track your vehicle's position and progress in relation to any storms.
It's a combination hardware/software device that uses a laptop as it's display. You can run this software concurrently with Street Atlas or any other GPS mapping software and bring it up whenever you see those big bad ugly clouds looming on the horizon. Then you can make a decision whether to detour, continue, or hunker down in a safe spot for a while.
I've done a complete review on my website at
www.RVcruzer.com/weather.htm so rather than repeat it here simply click on the link and view that page. Included are links to the manufacturer as well as a link to an online demo that is available.
It's some pretty impressive stuff.