eauier, Climate, and Society 2: Humidity and Human Comfort the heat index was cr

Question

eauier, Climate, and Society 2: Humidity and Human Comfort the heat index was created to better describe the combined effects of heat and humidity on humans. The heat index is calculated as a function of temperature (7) and relative humidity (RH), such that: HI--42.379+(2.04901523xT)+(10.14333127xRH)-(22475541xTxRH)- (00683783xT2)-(0548 1717xRH2)+(.001 22874 ???? RH)+(.00085282xTxRH-)- C00000199xT2xRH2) The heat index is used by the National Weather Service to issue heat advisories, watches, and warnings to the general public. The heat index is used for this because it better represents how we as when exposed to excessively heat inde humans feel warm and/or humid weather. Table 3 shows the National Weather Service x conditions necessary for advisories, watches, and warnings to be issued in Chicago. Table 3. Chicago National Weather Service actions based on heat index conditions. National Weather Service Action Issue a heat advisory Necessary Heat Index Conditions Maximum heat index is expected to exceed 105°F Issue an excessive heat watch index between 100°F and 105°F OR 2 consecutive days are expected with a peak heat index between 105°F and 110°F OR 1 day is expected with a peak heat index exceeding 110°F 3 consecutive days are expected with a peak heat index between 100° and 105°F OR 2 consecutive days are expected with a peak heat index between 105°F and 110°F OR 1 day is expected with a peak heat index exceeding 1 10°F Issue an excessive heat warning 1) Use the heat index lookup table provided to derive the heat index for the following temperature and humidity values: 35°C, 30% relative humidity:-- - 35°C, 60% relative humidity: 2) Based on the two heat index values above, what action (if any) would the Chicago National Weather Service office take? (2 pts.) Geography 104: Humidity Page 8

Explanation / Answer

ANS 1) APPROX 35 DEG ---- if temp 35deg C & relative humidity 30%-- ISSUE ALERT HEAT ADVISORY because HI is approx 96 deg F

ANS 2) APPROX 43DEG------if temp 35deg C & relative humidity 60%-- ISSUE EXESSIVE HEAT WARNING because HI IS APPROX 110deg F

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