The opposite of "wind chill". The Heat Index combines the effects of heat and humidity. Warm temperatures feel even warmer when it is humid.
HEAT INDEX VALUES AND THEIR EFFECTS...ESPECIALLY FOR PEOPLE AT HIGHER RISK.
80 to 90 degrees - Fatigue possible with prolonged exposure and/or physical activity.
90 to 105 degrees - Sunstroke, heat cramps, and heat exhaustion possible with prolonged exposure and or physical activity.
105 to 130 degrees - Sunstroke, heat cramps or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity.
130 degrees and higher - Heatstroke/sunstroke highly likely with continued exposure.