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Weather Underground midday recap for Tuesday, September 30, 2014

A low pressure system drifted over the northern Plains on Tuesday, while a separate system skimmed across the coast of New England.

A strong low pressure system lifted north northeastward over the northern Plains. This system interacted with a warm, muggy air mass, which initiated rain and thunderstorms across a handful of states. Flood warnings were issued in northeast Colorado, while flood advisories were issued in southwest South Dakota. Custer, S.D., reported a midday total of 1.51 inches of rain. Ellsworth Air Force Base, S.D., reported a midday total of 1.09 inches of rain. Just to the west of this system, a cold air mass spread across the Intermountain West. Frost advisories were issued in south central Colorado on Tuesday. Wolf Creek Pass, Colo., recorded a morning low of 23 degrees. Monarch Pass, Colo., recorded a morning low of 26 degrees. Meanwhile, a cold front extended across the northern Rockies, the Great Basin and northern California. Scattered showers developed along this frontal boundary over the Pacific Northwest and the Intermountain West, while high elevation snow showers affected to Rockies.

A wave of low pressure moved east southeastward over the eastern Great Lakes. This system pushed rain over the Ohio Valley and parts of the Northeast. Additionally, a low pressure system skimmed across the coast of New England, as moderate to heavy rain moved over several states. To the south, a stationary front extended across the Gulf Coast and Florida. Isolated thunderstorms developed over Florida on Tuesday. Leesburg, Fla., reported a midday total of 1.40 inches of rain.

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