Weather Underground Forecast for Friday, August 03, 2012.

Areas of active weather will continue across the nation on Friday. In the North, a trough of low pressure will dip into the Northern Rockies from western Canada. This system will pull a strong cold front eastward with it as it moves over the Dakotas and into the Upper Midwest. Expect moderate to heavy showers and thunderstorms to develop along this frontal boundary, some of which will turn severe with damaging winds and large hail. Behind this activity, high fire danger continues for the Northern Rockies and Intermountain West as hot and dry conditions prevail. Meanwhile, monsoonal moisture over the Southwest and Four Corners advances northward into the Central Rockies and Great Basin. This will maintain chances for shower and thunderstorm activity on Friday. High pressure over the West Coast will maintain warm and dry conditions. However, coastal areas will remain cloudy and cooler.

In the East, a stalled front lingers over the Southeast, stretching from the Lower Mississippi River Valley through the Carolinas. Moisture from the Gulf of Mexico will continue feeding energy into this system, supporting widespread showers and thunderstorms throughout the day.

In the Plains, a dominant ridge of high pressure remains the main weather feature from the Southern and Central Plains through the Tennessee Valley. This will keep the region sunny and hot, with highs exceeding 100 degrees and heat index values approaching 120 degrees. Thus, excessive heat warnings and heat advisories will remain in effect for these areas. Temperatures in the Lower 48 states Thursday have ranged from a morning low of 32 degrees at Truckee, Calif. to a high of 109 degrees at Chandler, Okla.