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Weather Underground midday recap for Thursday, September 29, 2016

A low pressure system produced heavy rain across the eastern third of the country on Thursday, while monsoonal thunderstorms fired up in the Southwest.

An area of low pressure shifted slowly southeastward across the Midwest and the Tennessee Valley. This system, combined with a cold frontal boundary, generated heavy rain and embedded thunderstorms in the Midwest, the Mid-Atlantic and the Southeast. Flood warnings were issued in portions of eastern Iowa, northern Illinois, northern Indiana and southern Michigan. Detroit, Mich., reported a midday total of 3.92 inches of rain. Flood warnings and flood watches were also issued from southern Pennsylvania to North Carolina. Wallops Island, Va., reported a midday total of 5.58 inches of rain. Fayetteville, N.C., reported a midday total of 5.11 inches of rain. In addition, a cool air mass settled in from the northern Plains to New England. Clayton Lake, Maine, recorded a morning low of 30 degrees. Aberdeen, S.D., recorded a morning low of 33 degrees.

Out west, monsoonal thunderstorms continued to develop across the Desert Southwest, the Intermountain West and parts of the Great Basin. Flash flood watches were issued for portions of southern and eastern Utah. Most of the West Coast experienced a dry weather pattern on Thursday.

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