Extreme Heat: Looking Beyond the Headlines.
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Extreme_Heat_Quick_Guide_v1.0_2026
Extreme heat is more than a high number on a thermometer. Risk depends on temperature, humidity, length of exposure, nighttime cooling, physical effort, health status, access to cooling, and how unusual the conditions are for a particular place and season. National Weather Service alerts and HeatRisk information translate forecasts into expected health impacts; local thresholds can differ.
Temperature: Air temperature is only one measure. Direct sun, hot surfaces, poor ventilation, and physical activity can increase heat exposure.
Heat index: The heat index combines air temperature and relative humidity to describe how hot conditions feel in the shade.
HeatRisk: HeatRisk uses forecast heat and local conditions to communicate possible health impacts over the coming days.
Nighttime heat: Warm nights can prevent the body and buildings from cooling, increasing strain across consecutive
Extreme_Heat_Quick_Guide_v1.0_2026
Extreme heat is more than a high number on a thermometer. Risk depends on temperature, humidity, length of exposure, nighttime cooling, physical effort, health status, access to cooling, and how unusual the conditions are for a particular place and season. National Weather Service alerts and HeatRisk information translate forecasts into expected health impacts; local thresholds can differ.
Temperature: Air temperature is only one measure. Direct sun, hot surfaces, poor ventilation, and physical activity can increase heat exposure.
Heat index: The heat index combines air temperature and relative humidity to describe how hot conditions feel in the shade.
HeatRisk: HeatRisk uses forecast heat and local conditions to communicate possible health impacts over the coming days.
Nighttime heat: Warm nights can prevent the body and buildings from cooling, increasing strain across consecutive
