The nation's weather

Weather Underground Forecast for Saturday, August 4, 2012.

Showers and thunderstorms were expected to move through the Midwest and high heat was to develop in the Northwest on Saturday. A low pressure system moving through the Great Lakes was expected push a cold front over the Upper Midwest and into Mid-Mississippi River Valley, extending southwestward into the Central Plains. The tail end of this cold front was forecast bring little relief to the hot temperatures in the Central and Southern Plains. High temperatures were expected to remain in the lower 100s. The northern side of this system was forecast to produce more moderate to heavy showers and thunderstorms throughout the day. Some of these storms might turn severe with large hail and damaging winds. There was a slight chance of severe weather development across most of the Midwest and Mid-Mississippi River Valley.

In the South, shower and thunderstorm activity was expected to persist for the Eastern Valleys and Southeastern states as a trough of low pressure pulls warm and humid air onshore. Severe thunderstorm development was not anticipated in these areas. Further south, in Florida, a tropical wave of low pressure continued to move in from the Bahamas, bringing moderate to heavy showers and thunderstorms. This system had a low, 20 percent chance of tropical cyclone development through the weekend, but was forecast to allow for heavy rains and strong winds to continue.

In the West, monsoonal moisture is expected to bring more showers and thunderstorms to the Southwest, southern Nevada, and parts of California Saturday afternoon and evening. In the Northwest, however, a ridge of high pressure was to build over the Pacific Northwest and Intermountain West, creating a significant warming trend for the region. Coastal areas were expected to see highs in the 80s, while inland areas were forecast to approach 100 degrees.

Source: http://news.yahoo.com/nations-weather-094902441.html

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