The Nation's Weather
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Thunderstorms were expected to sweep across the Plains on Monday, and forecasters said large hail and strong wind gusts were possible in Iowa.
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A brief surge of bitter cold and  powerful wind will sweep into the U.S. Midcontinent Wednesday  and Thursday, sending temperatures down as much as 40 degrees  in some cities, weather forecasters predicted.
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Rain and snow fell across the Northeast, parts of the Upper Midwest and upper elevations in the Northwest on Friday.
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A cold front is expected to move through much of the eastern third of the country on Saturday, bringing rain to areas east of the Mississippi River.
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Affected by a weak El Nino, winter  weather in the United States will be warmer in the West and  cooler and wetter in the South and Southeast, forecasters  predicted Thursday.
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Snow, ice and rain were forecast to move through the Northeast on Friday, with the interior of New England seeing mostly snow. Coastal regions were expected to get snow mixed with rain, turning completely to rain later in the day.
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Forecasters predicted rain in the Southeast and southern Plains, falling temperatures in New England and sizzling heat in the Southwest on Sunday.
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Mild weather settled over much of the nation early Monday, although rain clouds lingered over the Great Lakes and thunderstorms swept through Texas, New Mexico and Louisiana.
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Winter will be warmer than normal in  the U.S. Western and Plains states and colder than usual in the  Southeast and mid-Atlantic regions, but the return of El Nino  is making it hard for forecasters to hazard a guess for much of  the country, meteorologists said on Wednesday.
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Coastal rain and mountain snow were forecast for Tuesday across the Northwest and parts of the Great Basin. Wind gusts of up to 70 mph were possible in the Northern Rockies.
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A cold front swept through the nation's midsection Tuesday, while clear and sunny weather dominated the East Coast.
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A frontal system spanning the East Coast on Wednesday was expected to produce rain throughout the Southeast and Mid-Atlantic states and snow in the Appalachians, parts of the Northeast and New England.
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The National Weather Service on  Thursday predicted above-normal August temperatures for the  Southeast, Rockies and Western regions.
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Rain and snow fell over parts of the West, the Upper Midwest and Great Lakes region on Monday, while the rest of the nation was mostly clear and sunny.
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Severe thunderstorms were forecast Friday throughout the nation's midsection as a large low-pressure system slowly drifts through the Northern Plains.
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Rain in the Southwest was expected to spread through the Mid-Atlantic and Northeast on Friday and eventually into the Midwest, while mostly clear skies were forecast for the West.
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Frigid air and gusts of snow created below-zero wind chills and white-out conditions across much of the country.