Heat Index / Heat Disorders 

 
Heat Index / Heat Disorders
Heat
Index
Possible heat disorders for
people in higher risk groups
130°F or higher Heatstroke/sunstroke highly likely with continued exposure.
105° - 130°F Sunstroke, heat cramps or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity.
90° - 105°F Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
80° - 90°F Fatigue possible with prolonged exposure and/or physical activity.
 

The "Heat Index/Heat Disorders" table relates ranges of HI with specific disorders, particularly for people in the higher risk groups.