Uw Atmospheric Sciences Page 2

2. Heat index (apparent temperature)

a. Use the appropriate calculators (there is a link on the Assignments webpage to a page with

both of these) to determine the relative humidity and the heat index for each of the three

scenarios listed below. (Note: Be sure to use the Fahrenheit calculators and not Celsius.)

Pheonix, Arizona- Temperature: 110°F

Relative humidity:

Heat index:

Dew point:

40°F

Dallas, Texas-

Temperature: 95°F

Relative humidity:

Heat index:

Dew point:

74°F

Houston, Texas- Temperature: 90°F

Relative humidity:

Heat index:

Dew point:

79°F

b. Why does a very high temperature combined with high relative humidity make us feel like it

is warmer than what the temperature actually is?

c. Why does a very high temperature combined with extremely low relative humidity make us

feel like it is slightly cooler than what the temperature actually is?

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Parent category: Education