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Story summary
- Two heat domes are expected to merge into a system dominating the eastern United States through July 4.
- A heat dome is building over the eastern United States and will bring extreme heat into early July.
- The National Weather Service Climate Prediction Center issued a hazardous-heat warning for the region.
- Heat indexes may reach 100-110 °F, with some Mississippi cities exceeding 112 °F.
- The dome’s core is forecast over the Ohio, Mississippi and Tennessee Valleys, with thunderstorms possible.
