Although I use DR's Wx page when flight planning I also use
www.wunderground.com ...free but $5/yr gets you no ads). Wunderground revamped it's web page layout and the new design looks really slick with tab browsing.
LOTS, of weather info including aviation weather maps.
Check out the "Full Screen Weather" under the "Maps & Radar" tab.
Really cool and from an RV pilots point of view. Safety of flight and all.