A cold frontal boundary will transition over the Northwest on Wednesday, while a separate frontal boundary shifts across the East Coast.
A Pacific frontal boundary will extend southwestward from southwest Canada to northwest California. As this cold frontal boundary moves east southeastward, it will produce light to moderate rain from the northwest corner of California to western Washington. Cool air will also settle in over the Pacific Northwest and the upper Intermountain West. High elevation snow showers will be possible for the northern Cascades. A ridge of high pressure should keep conditions dry across the Southwest, the Great Basin and the Intermountain West.
Meanwhile, a large area of low pressure will focus over northwest Mexico and the southern high Plains. This system will draw moisture from the Gulf of Mexico, leading to showers and thunderstorms in southeast New Mexico and much of Texas.
To the east, a cold frontal boundary will stretch south southwestward from New England to the northern Gulf of Mexico. This frontal boundary will be the focal point for showers and thunderstorms along the Gulf Coast. Light to moderate rain will develop in portions of the Mid-Atlantic, southern New England and the eastern Ohio Valley. A blast of cold air will trail this frontal boundary over the upper Midwest and New England. As a result, a mixture of rain and snow will develop in Upstate New York and northwest New England.
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