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Weather Underground midday recap for Friday, August 22, 2014
A low pressure system moved across the upper Intermountain West on Friday, while an area of low pressure focused over the Mid-Atlantic.
A low pressure system moved slowly eastward over the Pacific Northwest and the upper Intermountain West. This system ushered heavy rain and thunderstorms over the region, as flash flood watches were issued in northern Washington, Nevada and western Montana. Temperatures dropped 10 to 15 degrees below normal over the northern Rockies, as winter weather advisories were issued in northwest Montana. Monsoonal moisture initiated scattered showers and thunderstorms over the Great Basin and the Four Corners, as Akron, Colo., reported a midday total of 0.84 inches of rain. High pressure kept conditions clear across the West Coast.
Meanwhile, a cold front extended across the upper Midwest, the Ohio Valley, parts of the Northeast and the Mid-Atlantic on Friday. This frontal boundary interacted with a warm, humid air mass from the Gulf of Mexico to trigger isolated thunderstorms over a handful of states. Heavy rain impacted parts of the Ohio Valley and the Mid-Atlantic, as flash flood watches were issued in Indiana, Ohio, northwest Kentucky, West Virginia and western Virginia. Flash flood warnings were also issued in Indiana, as Valparaiso, Ind., reported a midday total of 3.21 inches of rain. To the south, heat advisories were issued across the eastern Gulf Coast and the Southeast. Temperatures ranged between the 90s and 100s across the region, as Quincy, Fla., recorded a midday high of 102 degrees.