NWS HeatRisk is a color-numeric-based index that provides a forecast risk of heat-related impacts to occur over a 24-hour period. HeatRisk takes into consideration:

- How unusual the heat is for the time of the year.


- The duration of the heat, including both daytime and nighttime temperatures.


- If those temperatures pose an elevated risk of heat-related impacts based on data from the CDC. https://sierrawave.net/nws-heat-briefing-owens-valley-to-stay-minor-while-death-valley-will-be-moderate/