An active weather pattern will impact the central third of the country on Wednesday, while a Pacific system approaches the West Coast.
A low pressure system will move east northeastward across the upper Great Lakes and southeast Canada. This system will usher a mixture of rain and snow over the upper Midwest and the Northeast. A cold frontal boundary associated with this system will stretch south southwestward from the Great Lakes to the southern Plains. As this frontal boundary transitions east northeastward, a wave of low pressure will develop over the southern Plains and the western Gulf Coast. This system will draw warm and moist air from the Gulf of Mexico, which will fuel heavy rain and strong to severe thunderstorms over the southern and central Plains, the lower and middle Mississippi Valley, the western edge of the Tennessee Valley and parts of the Midwest. Severe thunderstorms will be possible in eastern Texas and Louisiana. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain will bring threats of flash flooding to western Illinois, Missouri, Arkansas, Louisiana, eastern Texas and eastern Oklahoma.
Out west, a Pacific low pressure system will approach the coasts of Oregon and Washington. A warm frontal boundary will extend eastward, and will produce light to moderate rain and high elevation snow across northern California, the Pacific Northwest and the upper Intermountain West. Periods of heavy snow will impact western facing slopes across the northern Cascades. Flash flood watches are in place for parts of Washington and northern Idaho. Most of the Southwest will stay clear of precipitation on Wednesday.
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