This is the blog for the United States' national forecast. These summaries are by Weather Underground forecasters and are updated twice each day.
By: nationalsummary , 10:13 PM GMT on August 30, 2014
Weather Underground Forecast for Sunday, August 31, 2014
A cold front will extend from the Great Basin to the northern Plains on Sunday, while a separate cold front will stretch from the upper Mississippi Valley to the central Great Lakes.
A strong area of low pressure will move across the northern Plains on Sunday. A cold frontal boundary associated with this system will extend over the northern and central Plains, the central Rockies and the Great Basin. As warm, humid air streams northward from the Gulf of Mexico, it will collide with this frontal boundary to initiate strong to severe thunderstorms over the nations midsection. Severe thunderstorms will be possible over Kansas, Nebraska, northwest Missouri, Iowa, eastern South Dakota, Minnesota and northwest Wisconsin. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Additionally, scattered showers will trail this system and linger over parts of the Pacific Northwest and the Intermountain West. High pressure will keep conditions mostly clear across the Southwest on Sunday. Temperatures are forecast to exceed 100 degrees across the region.
Meanwhile, an abundance of moisture will spread across the eastern third of the country, triggering rain and thunderstorms over the Gulf Coast, the Southeast, the Tennessee Valley, the Ohio Valley, the Mid-Atlantic and the Northeast. Temperatures are forecast to range between the 80s and 90s across the East Coast.
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