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Updated: 3:32 PM GMT on April 19, 2015
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Weather Underground Forecast for Sunday, April 19, 2015

A low pressure system will advance eastward over the Mississippi Valley on Sunday, while a ridge of high pressure will persist over the West Coast.

A vigorous area of low pressure will slide east northeastward across the Mississippi Valley. This system will draw moisture from the Gulf of Mexico, which will initiate strong to severe thunderstorms across the Mississippi Valley, the Midwest and the Deep South. Severe thunderstorms will be possible across a handful of states, including eastern Texas, Louisiana, Arkansas, southern Missouri, southern Illinois, western Kentucky, Tennessee, northwest Georgia, Alabama, western Florida and Mississippi. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Heavy rain and thunderstorms will also impact the Mid-Atlantic, which could lead to flash flooding across northwest South Carolina, western North Carolina and southwest Virginia. High pressure will keep conditions calm across New England on Sunday.

Meanwhile, a separate area of low pressure will develop over the upper Midwest. This system will usher moderate rain and stray thunderstorms across the northern Plains and the upper Mississippi Valley. Scattered snow showers will wind down across the eastern Rockies.

A ridge of high pressure will park itself over the eastern Pacific. This system will bring dry conditions to the Pacific Northwest, the Great Basin and the Southwest. Temperatures are forecast to range between the 80s and 90s across the Desert Southwest.

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