A heat dome threatens the Fourth of July weekend with extreme temps and power strain

Temperatures are set to rise as a heat dome forms over parts of the US. Spencer Platt/Getty Images A heat dome is sending temperatures soaring in parts of the central and eastern US. The extreme temperatures come just around the corner from the Fourth of July holiday weekend. High electricity use is straining the grid, and Chicago residents are being told to reduce consumption. An intense heat dome is building across parts of the US ahead of the Fourth of July holiday weekend. People in cen...