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Associated Press

Posted on July 13, 2014 at 4:03 AM

Updated Sunday, Jul 13 at 4:05 AM

Weather Underground Forecast for Sunday, July 13, 2014

A cold frontal boundary will extend from the southern Plains to the central Great Lakes on Sunday, while a separate cold front will stretch from the Intermountain West to the western Great Lakes.

A cold front is forecast to extend across the southern Plains, the middle Mississippi Valley, the upper Midwest and the central Great Lakes on Sunday. As warm, humid air interacts with this frontal boundary, strong to severe thunderstorms will develop over the eastern third of the country. Severe thunderstorms will be possible across eastern Missouri, southern Illinois, Indiana, Kentucky, Ohio, northwest West Virginia, Pennsylvania and New York. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Disorganized thunderstorms will also move across parts of the southern and central Plains, as well as the middle Mississippi Valley. Temperatures are expected to drop 10 to 20 degrees behind this frontal boundary over the northern Plains, the upper Midwest and the Ohio Valley. A separate cold front will stretch across the upper Intermountain West, the northern Plains and the upper Mississippi Valley. This system will usher showers across the northern tier of the country on Sunday.

An onshore flow from the Gulf of Mexico will trigger thunderstorm activity over the Gulf Coast and the Deep South. Sea breeze induced thunderstorms will also pop up over parts of the Southeast and the southern Mid-Atlantic.

Out west, a trough of low pressure will bring scattered showers and thunderstorms to central Oregon and Washington. High pressure over the eastern Pacific will keep conditions clear across the remainder of the West Coast on Sunday.

Temperatures in the Lower 48 states Saturday have ranged from a morning low of 41 degrees at Big Bear City, Calif. to a high of 102 degrees at Bullhead City, Ariz.

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