Heavy rain will impact the Northeast on Friday, while a cold frontal boundary shifts over the Northwest.
An area of low pressure over the western Atlantic will drift northward along the Mid-Atlantic and the coast of New England. This system will merge with a cold frontal boundary, which will lead to moderate to heavy rain and embedded thunderstorms across the northern Mid-Atlantic and New England. Prolonged heavy rain will bring threats of flash flooding to Upstate New York, western Massachusetts, Vermont, New Hampshire and Maine. The aforementioned frontal boundary will extend south southwestward from New England to the western Gulf Coast. This frontal boundary will produce showers and thunderstorms in parts of the Mid-Atlantic, the Southeast and the coast of southern Texas. Additionally, cold air will trail this system. Temperatures will drop 5 to 15 degrees below normal from the upper Midwest to parts of the Northeast. This cold air mass could support a mixture of rain and snow in parts of the Midwest, the interior Mid-Atlantic and western New England.
Meanwhile, a weak frontal boundary will transition eastward from the northern high Plains to the upper Mississippi Valley. This frontal boundary will produce light to moderate showers in the northern Plains and northern Minnesota. Further to the west, a Pacific system will move onshore over the Pacific Northwest. Light to moderate showers and high elevation snow will develop from Washington and Oregon to the northern high Plains. High pressure will keep a dry air mass in place over the Southwest on Friday.
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