Sweltering heat to bake Southwest, California before South, Southeast

Temperatures are soaring as we head into the weekend beneath an intense and sprawling heat dome that will bring triple-digit heat to 45 million Americans in the coming week. Heat advisories and excessive heat watches and warnings blanket the map in the Desert Southwest and California, with the heat set to expand into the central United States this weekend.

By early next week, the stifling heat dome will shift to the eastern Lower 48, baking the Ohio Valley, Midwest, Southeast and Mid-Atlantic. Highs could run 10 to 15 degrees above...