The National Weather Service and the Centers for Disease Control and Prevention have unveiled a new color-coded heat risk system that combines meteorological and medical risk factors to alert Americans to dangerous heat conditions. The system uses five categories: pale green (little to no risk), yellow (minor risk), orange (moderate risk), red (major risk), and magenta (rare and/or long-duration extreme heat with little to no overnight relief). This new system is designed to provide simplified and easy-to-understand information about heat risks for the coming weeks. The system will be available on the websites of the CDC and the National Weather Service.