US heat risk forecast

This map shows the forecast risk for heat-related health effects within a 24-hour period for each location in the contiguous United States. Darker shades represent higher risk levels.

Note: The map shows four risk categories: Minor affects very heat-sensitive people, especially if they’re outdoors without cooling or enough water; Moderate affects sensitive people, could impact some health systems and industries; Major affects anyone without cooling or enough water, likely to impact health systems, industries and infrastructure; and Extreme affects those without cooling or water during prolonged heat with no cool nights, likely to impact most health systems, industries and infrastructure. Areas not shaded represent very low to no risk from heat.

Source: National Weather Service and the US Centers for Disease Control and Prevention

Graphic: Byron Manley, Matt Stiles and Renée Rigdon, CNN