The last week of July and start of August brings no shortage of impactful weather across North America. Severe thunderstorms, flash flooding, and prolonged dangerous heat are the major concerns through the first few days of August. The Plains and Midwest face several rounds of thunderstorms, while the Southwest continues to battle flash flood threats from monsoonal rains. A late-week cold front shifts the storm focus to the Carolinas and Southeast, and finally begins to erode the long-standing heat wave gripping the central and eastern U.S.
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A highly active weather pattern is setting up across the southern and central United States this week. The biggest concern is a prolonged flooding threat from South Texas through Louisiana and into portions of the Lower Mississippi Valley, where repeated rounds of tropical downpours could produce significant flash flooding. Meanwhile, a powerful storm system will bring the risk of severe thunderstorms from the Midwest into the Great Lakes and Ohio Valley on Wednesday, with damaging winds, large hail, and a few tornadoes possible. While heat eases somewhat across the West, temperatures will remain above average in parts of the Pacific Northwest and California before additional cooling arrives later this week.