HeatRisk is a health-based forecast developed by the National Weather Service (NWS) and the Centers for Disease Control and Prevention (CDC). The map uses the following 5-level scale:

Source: https://www.wpc.ncep.noaa.gov/heatrisk/

To view information about the calculations, uses, sources, and more, please click the green About Data button in the upper right corner of the map. To download the map data, please use the Download button next to the About Data button. To see data for a specific date, please use the dropdown date selector in the map.