A low pressure area brought heavy rain to the Mississippi Valley on Monday, while hot and dry weather persisted west of the Continental Divide.
An area of low pressure transitioned northeastward across the middle Mississippi Valley. This system brought moderate to heavy rain and embedded thunderstorms to the interior Mid-Atlantic, the Midwest and the middle Mississippi Valley. Flood warnings and flash flood watches were issued from northeast Arkansas to southern Michigan. Cahokia, Ill., reported a midday total of 3.44 inches of rain. St. Louis, Mo., reported a midday total of 2.42 inches of rain. A weak frontal boundary associated with this system extended south southwestward. Rain and thunderstorms fired up along and near this frontal boundary over the southern Plains and the lower Mississippi Valley. Flash flood watches and flood warnings were issued in southeast Texas and southern Louisiana. Cotulla, Texas, reported a midday total of 2.22 inches of rain.
Meanwhile, scattered monsoonal thunderstorms popped up across the central and southern Rockies, as well as the eastern edge of the Great Basin. Most areas west of the Continental Divide experienced warm and dry weather on Monday. Heat advisories remained in place for parts of southern California. Palm Springs, Calif., recorded a midday high of 105 degrees. Bullhead City, Ariz., recorded a midday high of 107 degrees.
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