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Associated Press

Posted on April 13, 2014 at 4:04 AM

Updated Sunday, Apr 13 at 4:06 AM

Weather Underground Forecast for Sunday, April 13, 2014

A cold frontal boundary will extend across the Great Basin, the Intermountain West, the central Plains and the upper Midwest on Sunday, while a ridge of high pressure will build over the eastern Pacific.

A low pressure system is forecast to develop to the lee of the Rockies over the central Plains on Sunday. This system will interact with a warm, muggy air mass from the Gulf of Mexico, bringing strong to severe thunderstorms to the central third of the country. Severe thunderstorms will be possible over a handful of states, including Texas, Oklahoma, Louisiana, Arkansas, Kansas and Missouri, bringing a chance of flash floods to the middle and upper Mississippi Valley. A cold front will also move across the region, as a mixture of rain and snow is expected over the northern Plains and the upper Midwest. Scattered showers and thunderstorms are also expected to move across the Tennessee Valley and the Southeast during the late afternoon and evening. An area of low pressure along the northern tier of the frontal boundary will shift across the Great Lakes. This system will bring a chance of rain and thunderstorms to parts of the Northeast, while freezing rain will be possible over northern New England.

A separate wave of low pressure will inch across the Great Basin and the Intermountain West on Sunday, as a mixture of rain and snow is expected over the Rockies. The heaviest snow will occur over the high elevations of the central Rockies.

High pressure over the eastern Pacific will keep conditions mostly clear across the West Coast. Temperatures will range between the 80s and 90s across the Desert Southwest.

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Temperatures in the Lower 48 states Saturday have ranged from a morning low of 17 degrees at Crane Lake, Minn. to a high of 93 degrees at Canadian, Texas

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