WTOC Weather Heat Index - WTOC-TV: Savannah, Beaufort, SC, News, Weather & Sports

Human Discomfort Scales



Temperature/Humidity Heat Index ...

The combined effects of humidity and temperature can produce a tremendous stress upon the body resulting in weakness, cramps, nausea and in severe cases, heat stroke which could lead brain damage or death. This simple chart can help reduce the effects of heat sickness by reducing outdoor activity when the apparent temperatures, or heat index, reaches high values.

During the months of May, June and July, if your activity is during the late morning or afternoon hours in the sun, you should add an additional 10-15 degrees to the value due to the effects of the solar radiation beaming down upon you.

In Savannah during the summer, "High noon" occurs at 1:24 PM. This is when the effects from the sun is most intense. It would be wise to avoid full exposure of the sun one to two hours from this time period.

Remember, use the current humidity and not the early morning near 100% values. As the temperature warms up during the afternoon, the relative humidity will drop.

The following guidelines indicate the potential for serious heat illnesses during exposed activities:

LIFE THREATENING ... Above 130
... Heatstroke/Sunstroke very possible even during short activities

EXTREME DANGER ... 105-130
... Heat cramps, exhaustion and or headaches likely even in short activities.
Heatstroke possible in prolong activities.

DANGER 90-105...
... Heat cramps, exhaustion and or headaches possible in prolong activities

CAUTION 80-90...
... Heat fatigue possible during prolong activities

... Temperature/Humidity Heat Index ...
Temperature 75 F 80 F 85 F 90 F 95 F 100 F 105 F
Relative Humidity Hx Hx Hx Hx Hx Hx Hx
100% 80 92 108 130 --- --- ---
95% 79 90 105 125 --- --- ---
90% 78 88 102 121 --- --- ---
85% 78 88 100 117 143 --- ---
80% 77 87 97 114 136 --- ---
75% 77 86 96 110 130 --- ---
70% 77 85 94 106 124 --- ---
65% 76 84 92 103 119 144 ---
60% 76 83 90 100 113 139 ---
55% 76 82 89 98 109 132 ---
50% 75 81 87 97 106 126 145
45% 75 80 87 95 104 120 137
40% 74 79 86 92 100 115 130
Powered by Frankly