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Even at temperatures as low as 75° F conditions can reach cautionary levels after two consecutive days. What relative humidity level must be reached for a 75° F day to reach the caution zone?

Even at temperatures as low as 75° F conditions can reach cautionary levels after two consecutive days. What relative humidity level must be reached for a 75° F day to reach the caution zone?

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Even at temperatures as low as 75° F conditions can reach cautionary levels after two consecutive days. What relative humidity level must be reached for a 75° F day to reach the caution zone?
AIR TEMPERATURE IDEGREES FAHRENHEIT) Extreme danger Danger RELATIVE HUMIDITY (PERCENT) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 140 125 135 120 128 130 117 122 131 125 111 118 123 131 141 123 130 120 107 111 118 715 103 110 99 107 111 115 120 182 105 108 112 105 95 97 100 102 105 100 $1 95 87 Extreme caution Apparent temperature is how hot the heat-humidity combination makes it feel. 139 148 127 135 143 151 117 123 130 137 143 150 109 113 118 123 129 135 142 149 104 107 110 115 120 126 132 138 144 107 110 114 119 124 130 136 Caution 106 109 113 117 122 85 78 97 99 102 105 108 77 78 79 79 87 88 89 91 80 73 74 75 76 77 75 69 69 70 71 72 72 73 73 74 74 75 75 76 76 77 77 78 78 70 64 64 65 65 66 68 67 67 68 68 68 69 70 70 70 71 71 71 79 79 80 71 71 72 How Forecasters Decide whether to Issue Excessive Heat Warnings NOAA's heat alert procedures are based mainly on Heat Index Values. The Heat Index, sometimes referred to as the apparent temperature is given in degrees Fahrenheit. The Heat Index is a measure of how hot it really feels when relative humidity is factored with the actual air temperature. Use the chart above to answer the following questions: To find the Heat Index temperature, look at the Heat Index chart below. As an example, if the air temperature is 96°F and the relative humidity is 65%, the heat index--how hot it feels-is 121°F. The Weather Service will initiate alert procedures when the Heat Index is expected to exceed 105°-110°F (depending on local climate) for at least 2 consecutive days.
Transcribed Image Text:AIR TEMPERATURE IDEGREES FAHRENHEIT) Extreme danger Danger RELATIVE HUMIDITY (PERCENT) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 140 125 135 120 128 130 117 122 131 125 111 118 123 131 141 123 130 120 107 111 118 715 103 110 99 107 111 115 120 182 105 108 112 105 95 97 100 102 105 100 $1 95 87 Extreme caution Apparent temperature is how hot the heat-humidity combination makes it feel. 139 148 127 135 143 151 117 123 130 137 143 150 109 113 118 123 129 135 142 149 104 107 110 115 120 126 132 138 144 107 110 114 119 124 130 136 Caution 106 109 113 117 122 85 78 97 99 102 105 108 77 78 79 79 87 88 89 91 80 73 74 75 76 77 75 69 69 70 71 72 72 73 73 74 74 75 75 76 76 77 77 78 78 70 64 64 65 65 66 68 67 67 68 68 68 69 70 70 70 71 71 71 79 79 80 71 71 72 How Forecasters Decide whether to Issue Excessive Heat Warnings NOAA's heat alert procedures are based mainly on Heat Index Values. The Heat Index, sometimes referred to as the apparent temperature is given in degrees Fahrenheit. The Heat Index is a measure of how hot it really feels when relative humidity is factored with the actual air temperature. Use the chart above to answer the following questions: To find the Heat Index temperature, look at the Heat Index chart below. As an example, if the air temperature is 96°F and the relative humidity is 65%, the heat index--how hot it feels-is 121°F. The Weather Service will initiate alert procedures when the Heat Index is expected to exceed 105°-110°F (depending on local climate) for at least 2 consecutive days.
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