Dangerous heat wave is building, will bring oppressive temperatures to much of the United States

Nino, a natural warming of the equatorial Pacific that alters weather patterns and spikes temperatures across the globe.

The current El Nino — which formed last month and is too young to have affected this heat wave much — is expected to rank as among the most intense since the weather service began tracking them in 1950, experts said.

It has an 81% continue reading …