- Two heat domes are merging into one larger heat dome expected to park over the central U.S. around the Fourth of July, bringing the season’s first widespread heat wave to much of the South and Midwest.
- Temperatures will be widespread in the 90s and 100s with some heat indexes topping 105; the hot zone moves from the Gulf Coast this weekend to near St. Louis by July 1 and toward Chicago by July 4.
- Good to plan cooler, indoor Fourth of July activities and stay hydrated—expect to avoid outdoor exertion during the peak heat.
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