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 A low pressure system in eastern Canada will continue pulling a cold front eastward from the Midwest and Great Lakes, up the Ohio River Valley and into the Northeast. This system will obtain moisture and energy from the Atlantic Ocean, which will allow for showers and thunderstorms to develop along the Eastern Seaboard. There is a slight chance that these storms will turn severe from the Washington, D.C.,
metropolitan area through New York City and surrounding areas. Main severe threats in these areas are damaging wind gusts, large hail and periods of heavy rainfall. Most areas will see 1 to 2 inches of rainfall on Friday, while over 2 inches are possible in areas of severe weather development.
This cold front will pull in cooler air from the north, bringing an end to the heat wave for the
eastern U.S. Temperatures will return to the 70s and 80s for most of the eastern
part of the country.
Out West, a low pressure system moves into the Pacific Northwest, kicking up scattered showers that will extend into northern California. Scattered thunderstorms will develop ahead of this system, as it moves off the
northern Rockies and into the northern Plains. To the south, fire danger remains high for the Great Basin, Four Corners and
southwestern U.S. due to a dominant ridge of high pressure.
Temperatures in the Lower 48 states Thursday ranged from a morning low of 27 degrees at Yellowstone, Wyo., to a high of 105 degrees at Needles, Calif.
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