A low pressure system will drift slowly across the Southwest on Wednesday, while temperatures stay below normal from the Plains to the Northeast.
An area of low pressure will begin to shift eastward across the Southwest. This system will keep showers and isolated thunderstorms in the forecast for portions of the Desert Southwest, the Great Basin and the Intermountain West. High elevation snow will be possible for the Rockies. As this system approaches the Plains, warm and moist air will be drawn from the Gulf of Mexico. This unstable air will result in numerous clusters of rain and thunderstorms, extending from the southern Rockies to the lower Mississippi Valley. Prolonged heavy rain over the southern Plains will bring threats of flash flooding to southeast New Mexico and a large portion of Texas.
Meanwhile, a Pacific cold front will swing across the Northwest. This system will generate showers and thunderstorms across the Pacific Northwest and the upper Intermountain West. Snow showers will be possible for the highest elevations of the Cascades and the northern Rockies.
Back east, the remnants of a frontal system will bring scattered showers to the central Appalachians and the Mid-Atlantic. Heavier rain is expected across the southern Mid-Atlantic and the Southeast as a low pressure system deepens along the Eastern Seaboard.
A cool air mass will remain in place from the central and northern Plains to the northern Mid-Atlantic and New England. Temperatures will be 10 to 20 degrees below normal compared to mid-May standards.
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