August 2, 2012: The nation's weather

Weather Underground Forecast for Thursday, August 02, 2012.

Expect little change in weather activity on Thursday as monsoonal moisture streams across the Southwest, high pressure ridging persists in the south-central U.S., a frontal disturbance pushes through the Midwest, and a trough of low pressure with waves of energy linger over the East.

In the West, monsoonal moisture will spread across southwestern California and the Four Corners kicking up afternoon monsoonal showers and thunderstorms. Expect chances of flood and flash flooding to remain possible with this activity.

Meanwhile, high pressure ridging in the south-central U.S. will maintian hot and humid conditions from the Central and Southern Plains through the western Tennessee Valley and Mid-South. Expect various Heat Advisories and Excessive Heat Warnings to remain in effect as daytime highs reach from 100 to 110 degrees.

In the Midwest, a frontal disturbance with low pressure will drop across the Upper Midwest and Central Plains with showers and clusters of thunderstorms.

Finally in the East, a trough of low pressure lingers over the eastern third of the nation and supports areas of showers and thunderstorms, while disturbances push into the region from the west. Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 32 degrees at Truckee-Tahoe, Calif. to a high of 113 degrees at Chandler, Okla.