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Weather Underground Forecast for Monday, September 22, 2014
An area of low pressure will move across the Pacific Northwest on Monday, while a cold front will extend across the Gulf Coast and the East Coast.
A low pressure system is forecast to drift north northwestward over the Pacific Northwest on Monday. This system will initiate scattered showers and thunderstorms over the eastern half of the Pacific Northwest, the Intermountain West and the Desert Southwest. A separate area of low pressure will approach the northwestern corner of the country, bringing showers to western Washington and western Oregon. A ridge of high pressure over the eastern Pacific will keep conditions mostly clear across California and Nevada.
Meanwhile, an extensive cold front will stretch across the Gulf Coast, the Southeast and the Eastern Seaboard. An onshore flow from the Gulf of Mexico will collide with this frontal boundary to trigger isolated thunderstorms across the Gulf Coast and the Southeast. The strongest storms will focus over Florida. A low pressure system along the northern end of the cold front will move northeastward over southeast Canada. Rain will trail this system and linger over the Northeast on Monday.
A large high pressure system will build over the upper Midwest. The Great Lakes, the Ohio Valley, the Tennessee Valley and the Mississippi Valley will avoid wet weather on Monday.