High school football teams across the West Coast delayed games as triple-digit heat threatened player safety. Schools implemented new monitoring systems and protocols.

Some emergency room doctors and nurses who are versed in climate change want more recognition of the ways overheating can precipitate ER visits for heart, respiratory and kidney disease.

Four small brush fires were contained in San Diego County on Friday. The heat and elevated fire risk has not stopped crowds of people from enjoying the Ramona rodeo, and fire crews are on high alert with additional firefighters stationed during this extreme heat event.

A dangerous heat wave has descended on much of California and the U.S. Southwest, with triple-digit temperatures expected along with a higher risk of wildfires.

The report, released this week, found that 58% of fast-food workers surveyed in July said they had worked in excessive heat conditions in the last year. And nearly half, or 48%, reported experiencing heat illness symptoms including headaches, fatigue, dizziness, confusion, muscle pain or nausea.