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The nation's weather
The eastern U.S. will see several areas of wet weather Sunday, while the Western U.S. will experience sunnier skies.
A large low pressure system spinning over Canada will push a frontal boundary extending from the Northeast and dipping into the Southern Plains. Showers and thunderstorms will develop ahead and along this boundary, and bring moderate to heavy rain showers over the Tennessee Valley and Southern Plains by the evening hours.
In addition, the availability of moisture from the Gulf of Mexico will aid in the development of showers and thunderstorms over parts of Florida. Meanwhile, a high pressure system positioned over the South will continue to bring hot and humid temperatures to the Southern Plains and Lower Mississippi Valley. Temperatures will reach over 100 degrees, with heat indices near 110 to 115.
To the west, high pressure over the Southwest will produce widespread areas of sunny skies and dry conditions for the Western U.S. However, a trough off the West Coast will bring weak, onshore flow producing morning low clouds and fog along the coasts.
This system will bring slightly cooler temperatures to the Pacific Northwest and parts of California. At the same time, monsoon moisture will continue to kick up scattered showers and thunderstorms for the Four Corners region and into the Central Rockies. Temperatures in the lower 48 states ranged Saturday from a morning low of 28 degrees at West Yellowstone, Mont., to a high of 105 degrees at Clarksville, Texas.
Weather Underground: http://www.wunderground.com
National Weather Service: http://iwin.nws.noaa.gov