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Weather Underground midday recap for Sunday, September 14, 2014

A cold front extended from the western Gulf Coast to the Mid-Atlantic on Sunday, while a low pressure system moved across the upper Midwest.

A cold frontal boundary stretched across the northern tier of the Gulf of Mexico, the Southeast and the southern Mid-Atlantic on Sunday. An onshore flow from the eastern Gulf Coast collided with this frontal boundary, which fueled thunderstorms over the Southeast and the Mid-Atlantic. Flash flood watches were issued in eastern Georgia and southern South Carolina. Augusta, Ga., reported a midday total of 1.81 inches of rain. Manning, S.C., reported a midday total of 1.45 inches of rain. High pressure kept conditions clear across the northern Mid-Atlantic and the Northeast. Freeze warnings were issued in Upstate New York, while frost advisories were issued across New England. Mount Washington, N.H., recorded a morning low of 24 degrees.

Meanwhile, an area of low pressure moved northeastward over the upper Midwest. This system ushered scattered showers across the Great Lakes on Sunday. To the south, an onshore flow from the western Gulf Coast initiated showers over Texas and eastern New Mexico.

The western third of the country avoided precipitation due to a large ridge of high pressure over the eastern Pacific. Temperatures ranged between the 90s and 100s across the Desert Southwest. Palm Springs, Calif., recorded a midday high of 104 degrees.

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