The Nation's Weather (AP)

This is the Weather Underground forecast for the nation Sunday, May 11, 2008. A major storm will track through the Mississippi Valley and provide heavy rain and strong thunderstorms from the Gulf Coast through the Ohio Valley. Precipitation will move into the Mid-Atlantic near the end of the day. (AP Photo/Weather Underground) AP - Thunderstorms and heavy rain were forecast Sunday for the Upper Mississippi Valley and Ohio Valley as strong low pressure systems move through the region.