A frontal system will drift over the eastern third of the country on Saturday, while monsoonal thunderstorms persist in the Southwest.
A cold frontal boundary will extend southwestward from New England to the middle Mississippi Valley. Showers and thunderstorms will fire up along and near this frontal boundary as it moves eastward. The heaviest rain is forecast to occur in the central Appalachians, the lower Mississippi Valley and the southern Plains. Relatively cool and dry air will settle in west of the frontal boundary over the upper Midwest and the Northeast. Moisture-rich air will also keep rain and thunderstorms in the forecast for the Deep South and the Southeast. Prolonged heavy rain will bring threats of flash flooding to the northwest corner of the Florida Peninsula.
Meanwhile, monsoonal moisture will linger over the lower Intermountain West and the Desert Southwest. Daytime heating will continue to trigger showers and thunderstorms across the Four Corners, especially during the afternoon and evening. Flash flooding will be possible along favorable mountain slopes.
Just to the north, a wave of low pressure and an associated cold front will generate isolated showers and thunderstorms across parts of the Pacific Northwest, the upper Intermountain West and the northern high Plains. Most of Oregon, California and Nevada will stay clear of precipitation on Saturday.
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