Active weather will impact the Northeast on Sunday, while monsoonal thunderstorms affect the Southwest.
An area of low pressure will transition slowly northeastward across the northern Mid-Atlantic and New England. This system will generate rain and thunderstorms over the upper Midwest and the Northeast. Prolonged heavy rain could lead to flash flooding in northeast Pennsylvania, northern New Jersey, western Connecticut, western Massachusetts, New York, Vermont, New Hampshire and southwest Maine. A cold frontal boundary associated with this system will extend southwestward across the Ohio Valley, the middle Mississippi Valley and the southern Plains. This frontal system will initiate showers and thunderstorms in the Midwest, the Deep South, the Mississippi Valley, the central Plains and the southern Plains.
Another area of low pressure will emerge over the northern high Plains. This system will produce showers and isolated thunderstorms over parts of the northern Plains.
Meanwhile, monsoonal moisture and daytime heating will lead to showers and thunderstorms across the Intermountain West, the Great Basin and the Desert Southwest. Heavy rain could bring flash flooding to southwest New Mexico and a large span of Arizona. Most of the Pacific Northwest will experience dry weather on Sunday.
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