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[June 22, 2010] (AP) Scattered storms were forecast to persist over the Great Lakes and Midwest on Tuesday as a low pressure system slowly moved through the central U.S.

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The system would create a cold front that would stretch from the northern Plains and into New England, kicking up scattered showers and thunderstorms throughout the day. Widespread scattered showers were expected over most of the northern U.S. with rainfall totals near half an inch. Forecasters said areas under thunderstorm development might see over an inch and a half, especially in areas of severe storms. This system had a history of producing strong and damaging winds, large hail, heavy downpours and even tornadoes. Flooding would threaten most of the upper and mid-Mississippi River Valley, as well as the Ohio River Valley. Most of the region was expected to remain in the 70s and 80s.

To the South, a large ridge of high pressure would spin over the Gulf of Mexico and stretch inland over the Southeastern states. This would continue pushing warm and humid air onshore, allowing for scattered showers and thunderstorms to develop in the afternoon. Most of the South would remain in the 90s.

In the West, onshore flow would bring low coastal clouds, while sunny skies and warm conditions would persist inland. A few lingering clouds were expected in the Pacific Northwest as a trough slowly moved out of the region.

Temperatures in the Lower 48 states Monday ranged from a low of 30 degrees at Leadville, Colo., to a high of 107 degrees at Mesa, Ariz.

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[Associated Press article from Weather Underground]