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Weather Underground Forecast for Saturday, September 15, 2012.

Showers and thunderstorms were to continue developing along a cold front that extends from the Northeast through the Southern Plains on Saturday. This system was pulling moisture in from the Gulf of Mexico, allowing for heavier showers and thunderstorms to develop from Texas through the Lower Mississippi River Valley. The northern side of this system was expected to bring scattered showers to the Northeast before it moved offshore and into the Atlantic Ocean by Saturday evening. Severe storms were not anticipated along this front as it continued to weaken throughout the day. As this front passed, cooler temperatures were expected to move through the Eastern Valleys.

High pressure was building behind this system and bringing dry conditions to the Plains and Midwest. However, high temperatures were likely to range from 10 to 20 degrees below seasonable from the Mid-Mississippi River Valley through the Southern High Plains.

To the north, a trough of low pressure was dipping into the Northern Rockies and Northern Plains on Saturday. This was to create flow from the south, which would pull warmer air into the region. It would allow for high temperatures to range from 10 to 20 degrees above seasonable across parts of the Northern Rockies and Northern Plains. This system was to create a weak cold front which may produce some scattered showers as it moves eastward across the U.S. and Canadian border. These showers were expected to be contained to the Northern Plains and northern Minnesota.

Out west, high pressure remained the dominant weather feature across the Western states. That was expected to maintain dangerous fire weather conditions for the Rockies and West Coast.