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[July 27, 2010] (AP) The main weather producer for Tuesday would be the cold front that was expected to push southeastward across the northern and central Plains as well as the upper Midwest.

(Click on map for larger image.)
This Weather Underground forecast for noon Tuesday says that a frontal boundary will linger over the Southeast with scattered showers and storms. Meanwhile, a cold front from Canada will move into the northern tier of the nation with unsettling weather. Active weather is also expected in the Southwest. (AP photo/Weather Underground)

As the front met with the rich moisture ahead of it, showers and thunderstorms were expected to fire up along and ahead of the cold front. The heaviest precipitation was expected over eastern portions of the northern Plains eastward to the upper Great Lakes region, where severe thunderstorms were likely to develop. Some of the stronger storms would be capable of producing large hail, damaging winds and a tornado or two. Cooler and drier weather was expected in the northern Plains and upper Midwest by Wednesday after the cold front passed through. Temperatures would fall into the 70s mainly.

Elsewhere, a stationary front over the Carolinas combined with rich moisture from the Gulf of Mexico would result in widely scattered showers and thunderstorms from Texas eastward across the middle and lower Mississippi valleys, Tennessee Valley, Southeast and Mid-Atlantic. In addition, monsoonal moisture would keep afternoon and evening showers and thunderstorms going over parts of the Southwest and the central and southern Rockies.

In the East, high pressure would dominate the Great Lakes and Northeast, providing seasonal temperatures. Moving to the West Coast, a low pressure system off the coast would continue bringing low clouds and fog to the coastal regions. This would will also result in cooling over the inland areas, bringing high temperatures down to near normal.

Temperatures in the Lower 48 states Monday ranged from a low of 35 degrees at Snake River, Wyo., to a high of 118 degrees at Death Valley, Calif.

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[Associated Press article from Weather Underground]