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Weather Underground Forecast for Tuesday, June 30, 2015
A low pressure system will move across the Great Lakes region on Tuesday, while above normal temperatures will persist over the Northwest.
An area of low pressure will shift east northeastward over the upper Midwest and the Great Lakes. This system will usher rain and thunderstorms over a large span of the Midwest and the interior Mid-Atlantic. A cold frontal boundary associated with this system will extend southwestward. As this frontal boundary transitions eastward, it will collide with warm, humid air from the Gulf of Mexico. The result will be numerous areas of showers and thunderstorms over the Deep South and the Southeast. Conditions will remain relatively calm across the southern Plains on Tuesday.
Meanwhile, a low pressure system will deepen over the northern Plains. This system will generate a line of showers and thunderstorms over the northern and central Plains. Monsoonal moisture will continue to spread northwestward across the western half of the country. Daytime heating will aid in the development of afternoon and evening thunderstorms across the Intermountain West and parts of the Southwest. The most likely areas that will experience thunderstorms will be along favorable mountain slopes. High pressure will keep conditions warm and dry across the West Coast, the Great Basin and the Pacific Northwest. Temperatures are forecast to range 10 to 20 degrees above normal across Oregon and Washington on Tuesday.