Antarctica

Weather Underground Forecast for Saturday, July 26, 2008.

A low pressure system over the Great Lakes will produce a front that extends down the East Coast and into the Central Plains on Saturday. The front will trigger showers and thunderstorms along its path as it moves into the Southeast. Storms over the Mississippi Valley will continue to cause problems with flooding. These storms have a history of becoming severe and are likely to produce strong winds, heavy rains, and hail, as well as possible tornado development.

The Southern Plains is under an excessive heat warning because a ridge of high pressure hovers over the region and brings hot air up from southern Texas. Expect highs to surpass 100 degrees in many areas on Saturday.

The Southwest will see wet conditions on Saturday. In addition to monsoon season, the remnants of Dolly will bring more moisture into the region, and allow for widespread showers and thunderstorms. Thus, flooding will be a concern in these areas.

The Pacific Northwest will see increasingly cloudy skies on Saturday as a low pressure system over the Gulf of Alaska pushes a cold front into the region. Cooler temperatures are expected, but the system lacks moisture, so only widespread light scattered showers are likely to occur. California will remain warm and dry with mostly clear skies and areas of smoke.

Temperatures in the Lower 48 states Friday ranged from a low of 32 degrees at Polebridge, Mont. to a high of 121 degrees at Death Valley, Calif.