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Weather Underground Forecast for Sunday, July 24, 2016

Periods of heavy rain will impact areas from the Plains to the Midwest on Sunday, while extreme heat affects the Southwest and the southern Plains.

An area of low pressure will transition east northeastward across south central Canada and the upper Great Lakes. A cold frontal boundary associated with this system will stretch southwestward from the upper Mississippi Valley to the central Rockies. As this frontal boundary moves southeastward, it will collide with hot and humid air. This interaction will result in rain and thunderstorms across the interior Mid-Atlantic, the Midwest, the middle Mississippi Valley and the central Plains. Prolonged heavy rain will bring threats of flash flooding to southeast Nebraska, northeast Kansas, southern Iowa, northern Missouri, Illinois, Indiana, southeast Michigan and western Ohio. Showers and thunderstorms will also pop up across the Deep South due to a warm and moist air mass over the region. Most of the Mid-Atlantic and New England should stay clear of precipitation.

Meanwhile, high pressure will keep dangerous heat in place over the Southwest, the southern Plains, the Midwest and the Mid-Atlantic. Temperatures will range anywhere from 5 to 15 degrees above normal for late July standards. Monsoonal flow will also result in isolated thunderstorms across the central and southern Rockies, as well as the Desert Southwest. High pressure will keep conditions fairly dry in the Great Basin and the Northwest on Sunday.

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