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Updated: 9:00 PM GMT on June 30, 2015
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Weather Underground Forecast for Wednesday, July 01, 2015

An area of low pressure will move across the Northeast on Wednesday, while a separate system will shift across the Plains.

An area of low pressure is forecast to move northeastward over New England and southeast Canada. This system will generate rain and thunderstorms across the northeastern corner of the country. A cold frontal boundary associated with this system will extend west southwestward over the Ohio Valley, the middle Mississippi Valley and the central Plains. As this frontal boundary transitions eastward, it will initiate a cluster of rain and thunderstorms across the Midwest and the Deep South. In addition, a wave of low pressure will take shape along the western end of the frontal boundary. This system will usher rain and thunderstorms over the northern and central Plains. Heavy rain could lead to flash flooding in Missouri, northeast Arkansas, northwest Tennessee, western Kentucky and southern Illinois.

Meanwhile, moisture from the Gulf of Mexico and the Gulf of California will pool northwestward over the Intermountain West and the Southwest. Daytime heating will aid in the development of showers and thunderstorms across favorable terrain, especially across the Rockies, the Wasatch and the Sierra Nevada. High pressure will keep weather conditions warm and dry over the Northwest. Temperatures will remain 10 to 20 degrees above normal over interior Pacific Northwest.

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