The nation’s weather

Weather Underground Forecast for Sunday, September 22, 2013.

An extensive cold will move over the Eastern Seaboard on Sunday, while a separate cold front will bring showers and thunderstorms to parts of the West Coast and northern Rockies.

Wet weather will move through the eastern third of the country on Sunday as a cold front moves over the East Coast. This cold front is expected to extend from Louisiana to Maine, and will be moving very slowly as a result of a high pressure system sitting off of the Eastern Seaboard. Gusty, southwesterly winds will accompany the frontal boundary, while plenty of rain should dampen the East Coast. Thunderstorms will also be possible in the southeast along the eastern Gulf Coast. Lingering showers and thunderstorms may also cause flooding in the eastern Midwest as a result of this slow moving storm system. The upper Plains will stay dry throughout Sunday due to high pressure over the Great Lakes.

The southern Rockies are expected to stay relatively dry on Sunday as high pressure sets up over the four corners states. Meanwhile, several low pressure systems will accompany a cold front that is expected to move over the western Great Basin. This cold front will bring wet weather to parts of the Great Basin and northern Rockies, and a chance for snow at high elevations. The Pacific Northwest will continue to experience showers throughout the day on Sunday as another cold front approaches the coast. Temperatures are expected to drop 5 to 10 degrees in the Southwest due to a recent cold front passage, while temperatures will remain clear.

Temperatures in the Lower 48 states Saturday have ranged from a morning low of 26 degrees at West Yellowstone, Mont. to a high of 97 degrees at Needles, Calif.

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