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Short Range Public Discussion
(Caution: Version displayed is not the latest version. - Issued 0706Z Aug 29, 2014)
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 306 AM EDT Fri Aug 29 2014 Valid 12Z Fri Aug 29 2014 - 12Z Sun Aug 31 2014 ...Heavy rain possible for portions of the Central Plains, Middle and Upper Mississippi Valley into the Upper Great Lakes... ...Heavy showers and thundershowers possible over portions of the Gulf Coast... ...After a dry and comfortable start, warmer and more humid air returns to the Northeast while cooler air floods the Northwest... A slow moving upper trough accompanied by a weak area of low pressure will lift slowly northeastward from the Central US toward the Great Lakes. This system will likely produce an area of heavy rainfall in the form of showers and thunderstorms especially from the Upper Mississippi Valley across the Great Lakes where rainfall totals could exceed 1 to 2 inches over the next few days. This system will weaken as it moves into Canada after crossing the Upper Lakes. A series of weak upper disturbances will be found over the Western Gulf of Mexico and help drive numerous showers and thundershowers especially over the Western and Central Gulf Coast. Here too, rainfall totals could be locally excessive with even the potential for some local flash flooding. Along the East Coast, high pressure and comfortably dry weather will give way to increasing humidity as the high pressure area moves off the New England coast. Another mass of cooler air will move into the North Central States but does not appear to drive appreciably southward beyond the northern tier of the Midwest as much of the cooler air remains north of the US Canadian border. Farther west...a significant push of cooler air will invade the northwestern quarter of the country through the weekend with showers especially likely across the higher terrain of the Pacific Northwest, the Great Basin and the northern Rockies. Kocin Graphics available at