An area of low pressure will shift across the Great Lakes on Saturday, while a separate system moves over the West Coast.
A low pressure system will push east northeastward across the eastern Great Lakes and southeast Canada. This system will usher a mixture of rain and snow across the upper Midwest. A cold frontal boundary associated with this system will stretch southwestward from the Great Lakes to the southern Plains. Showers and thunderstorms will fire up along and near this frontal boundary across the southern Plains, the Midwest, the Mid-Atlantic and parts of the Northeast. A separate system will drift across the western Atlantic. Morning storms will be possible in northern New England, while isolated thunderstorms pop up across southern Florida. Cool and dry air will settle in over the northern Plains and the upper Mississippi Valley. Temperatures will be 10 to 20 degrees below normal on Saturday.
Out west, a low pressure system will drift northeastward over northern California and Oregon. This system will usher light to moderate rain and isolated thunderstorms over the Pacific Northwest and the upper Intermountain West. A stalled out frontal boundary will also produce thunderstorms and high elevation snow across the central and southern Rockies. A dry weather pattern will persist across most of California and Arizona on Saturday.
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