A dangerous heat wave was building across the southwestern U.S. this week as millions of people there and in the South brace for record-breaking, and potentially deadly, temperatures.
Southwestern states are preparing for temperatures in the triple digits, joining Texas and Oklahoma which are in the middle of a continuing heat wave, the National Weather Service said. Areas including Arizona, Nevada and Central and Southern California are forecast to be under a heat dome that could trap warmth in the region for up to two weeks.
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