Heat Index Chart

                                      
The NWS has devised the "HEAT INDEX" (HI), sometimes called the
"apparent temperature."  The HI is the temperature the body feels when
the heat and humidity are combined.  The table below is the Heat Index
Chart.  (Note: This chart is based upon shady, light wind conditions.
Exposure to full sunshine can increase HI values by up to 15 F.)

Air Temperature (Degrees F)
         70    75    80    85    90    95   100   105   110   115   120

Relative
Humidity                           Heat Index

0%       64    69    73    78    83    87    91    95    99   103   107
10%      65    70    75    80    85    90    95   100   105   111   116
20%      66    72    77    82    87    93    99   105   112   120   130
30%      67    73    78    84    90    96   104   113   123   135   148
40%      68    74    79    86    93   101   110   123   137   151
50%      69    75    81    88    96   107   120   135   150
60%      70    76    82    90   100   114   132   149
70%      70    77    85    93   106   124   144
80%      71    78    86    97   113   136   157
90%      71    79    88   102   122   150   170
100%     72    80    91   108   133   166


Heat Index Readings and Potential Heat Related Disorders:

85 to 94 degrees F - Caution: physical activity may cause fatigue

95 to 105 degrees F - Extreme Caution: possible heat cramps and/or
heat exhaustion with prolonged exposure

Above 105 degrees F - Danger: possible heat stroke with prolonged
exposure; heat exhaustion and heat cramps likely