An area of low pressure affected the Midwest on Saturday, while monsoonal thunderstorms developed across the Southwest.
A low pressure system moved northeastward across the upper Mississippi Valley. This system ushered moderate to heavy rain and embedded thunderstorms over the northern Plains and the Midwest. Severe thunderstorm warnings and tornado warnings were issued in central Michigan on Saturday. Bangor, Mich., reported a tornado that took trees and powerlines down. Arbor Vitae, Wis., reported a midday total of 1.92 inches of rain. A cold frontal boundary associated with this system extended southwestward from the upper Midwest to the southern Plains. Rain and thunderstorms fired up along and ahead of this frontal boundary over the Midwest, the Deep South and the southern Plains. Flash flood warnings were issued in parts of central Texas and western Arkansas. Flood warnings were also issued in southern Louisiana. Del Rio Laughlin Air Force Base, Texas, reported a midday total of 4.53 inches of rain. Mount Ida, Ark., reported a midday total of 4.03 inches of rain.
Just to the west, monsoonal thunderstorms fired up across parts of the southern Rockies and the Desert Southwest. High pressure kept most areas across the Southwest, the West Coast and the Northwest warm and dry. Temperatures soared 10 to 20 degrees above normal across the Pacific Northwest. Excessive heat warnings were issued in western Oregon and western Washington.
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