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Weather Underground midday recap for Thursday, August 21, 2014

A cold front extended across the southern tier of the Great Lakes on Thursday, while an area of low pressure moved across the northern Plains.

A cold frontal boundary extended across the upper Midwest and the southern Great Lakes on Thursday. A low pressure system along the eastern end of the cold front ushered strong to severe thunderstorms over the eastern Great Lakes, the Northeast and the Mid-Atlantic. Severe thunderstorm warnings were issued in central Pennsylvania and south central New York. Flood advisories were also issued across the two states due to heavy rain over the region. Du Bois, Pa., reported a midday total of 1.10 inches of rain. Fort Drum, N.Y., reported a midday total of 0.98 inches of rain. Just to the south, isolated thunderstorms developed over the Ohio Valley, the Tennessee Valley, the Gulf Coast and the Southeast. Holden Beach, N.C., reported 1.00 inch sized hail. Dayton Wright, Ohio, reported a midday total of 1.00 inches of rain.

Meanwhile, a strong low pressure system moved over the northern Plains on Thursday. As this system interacted with warm, humid air draped across the nation’s midsection, strong thunderstorms developed over the northern Plains and the upper Mississippi Valley. St. James, Minn., reported a midday total of 3.18 inches of rain. Estherville, Iowa, recorded wind speeds of 63 mph.

Just to the west, scattered monsoonal thunderstorms developed across the Intermountain West, the Four Corners, the Great Basin and the Southwest. The West Coast stayed mostly clear on Thursday.

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