Antartica

Weather Underground Forecast for Thursday, May 15, 2008. A developing low pressure system will progress across the Mississippi Valley and along the Appalachian Mountains. This storm will carry a significant amount of moisture that will translate to areas of heavy rain and thunderstorms through the Southeast and lower half of the Mississippi Valley. The Storm Prediction Center has issued a slight chance of severe weather development from eastern Texas through Alabama. Residents in this region should monitor weather developments closely and be ready to take any precaution necessary.

Farther to the north, a cold front will sweep through the Northeast and instigate rain in the morning. Precipitation will diminish in the afternoon, only to increase in southern New England overnight into Friday morning.

Out West, a very large and intense ridge of high pressure will move onto the West Coast and bring another very warm day from the Northwest through the Southwest.

The Northeast will rise into the 60s and 70s, while the Southeast will see temperatures in the 70s, 80s, and some 90s. The Northwest will rise into the 80s, while California and the southwest will see temperatures in the 80s, 90s, and some 100s.

Temperatures in the Lower 48 states Wednesday ranged from a low of 22 degrees at Shirley Basin, Wyo. to a high of 106 degrees at Death Valley, Calif.