Active weather will affect states stretching from the southern Plains to the Midwest on Wednesday, while a wet weather pattern persists along the northwestern corner of the country.
A cold frontal boundary will extend southwestward from southeast Canada to the southern high Plains. This frontal boundary will transition slowly eastward, generating showers and thunderstorms from the Midwest to the lower Intermountain West. A wave of low pressure will form along this frontal boundary, which could result in locally heavy rain and strong thunderstorms over the middle Mississippi Valley. Scattered showers will also be possible in parts of the northern Mid-Atlantic and New England on Wednesday.
Meanwhile, a ridge of high pressure will build over the southeast quadrant of the country. This system will influence an onshore flow along the western Gulf Coast and the eastern edge of the Florida Peninsula. This onshore flow will result in scattered showers and isolated storms in eastern Florida and along parts of the Gulf Coast.
Out west, a cold frontal boundary will approach the West Coast. Moderate to heavy rain will develop ahead of this frontal boundary over western Washington. By Wednesday afternoon and evening, showers will develop in western Oregon and the northwestern corner of California. High elevation snow is also in the forecast for the northern Cascades. Most of the Great Basin and the upper Intermountain West will stay clear of precipitation on Wednesday.
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