The nation's weather

Weather Underground Forecast for Saturday, August 25, 2012.

Showers and thunderstorms continue across the Central U.S. on Saturday as a low-pressure system pushes another cold front through the Plains and into the Mississippi River Valley. This system will pull warm and moist air in from the Gulf of Mexico, supporting moderate to heavy showers and thunderstorms across the Central and Southern Plains, moving into the Mid- and Lower Mississippi River Valley. Some of these storms will turn severe with strong winds, large hail and periods of heavy rainfall. Lighter and more widespread showers and thunderstorms will develop along the northern side of this front as it moves through the Upper Midwest and into the Great Lakes.

In the East, the tail end of a frontal boundary will linger over the Carolinas, kicking up more showers and thunderstorms throughout the day. Meanwhile, Tropical Storm Isaac continues moving northwestward through the northern Caribbean Sea on Saturday. This system will maintain its strength as it moves over Cuba, producing heavy rains and strong winds throughout the day. This system will move into the southeastern Gulf of Mexico on Sunday.

Meanwhile out West, high pressure dominates the Western U.S., maintaining warm and dry conditions. This will keep fire danger high for most areas, with red flag warnings in effect for the Intermountain West and Northern Rockies. Showers and thunderstorms will continue to diminish across the Southwest as monsoonal moisture decreases over the region.