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.


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