HOME NUM LOCK Data for Sunday, September 8, 2002 HOME 57 40 °F 59 F 92 *F 66 \"F
ID: 285216 • Letter: H
Question
HOME NUM LOCK Data for Sunday, September 8, 2002 HOME 57 40 °F 59 F 92 *F 66 "F 81·F 58 2.2 mph 0.00 in. 6:34 a.m 7:17 p.m 6:35 a.m. 7:16 p.m. 89 "F high temp.(Sun) low temp.(Sun) normal high normal low 90-F 76 "F 6.9 mph 0.08 in. 7:05 a.m. 7:32 p.m. 7:05 a.m 7:31 p.m. 2.5 mph average wind speed (Sun.) precipitation total Sun. time of sunrise Sun. time of sunset Sun time of sunrise Mon. time of sunset Mon. 6:56 a.m 8:40 p.m. 6:59 a.m. 8:36 p.m. 1) How typical was the weather for each city on Sunday? 2) Was there precipitation? Can you get any information about the presence of clouds from this? 3) How do you think the presence (or absence) of clouds affected the temperature? 4) What is the reason for the difference in the amount of daylight lost by each of the cities? © 2003 Dept Atmospheric Sciences, Univ mnosExplanation / Answer
The table is as follows:
1) For Miami and Anchorage, the weather was typical average like any normal day. While Miami experienced hot temperature like normal Anchorage experienced the cold. However, for Springfield, the temperature was very peculiar and deviated heavily from the normal temperature (9.5o F deviation).
2) Yes, there was a precipitation of 0.08 in., in Miami and a trace precipitation (less than 0.01 in) in Anchorage. There was no precipitation in Springfield which experienced a rather hot weather condition on Sunday. We can only speculate that there were few clouds in Miami and Anchorage, but no clouds in Springfield. However, we can not guarantee such conditions from the given information as there can be clouds but no rain in some instances and in some other trace amount of rain without clouds.
3) Cloud usually have opposite effects on temperature during daytime and night. During daytime, the clouds decrease the temperature by blocking sunlight and during the night they increase it by blocking the outgoing radiation from the earth. The presence of few clouds in Miami and Anchorage might have yielded the similar patterns of temperature in these cities.
4) The main reason is the latitude of these cities. The amount of daytime lost increases as you go up the latitude due to the axial tilt of the earth. Therefore, the daytime loss is gradual in Miami with low latitude and higher in Anchorage with higher latitude.
Miami, FL(26 N) Springfield, IL
(40 N) Anchorage, AK
(62 N) 1. Daily temperature range 89 - 77 = 12 deg F 92 - 66 = 26 deg F 57 - 40 = 17 deg F 2. Mean daily temperature 83 79 48.5 3. Normal mean daily temperature 83 69.5 48.5 4. Departure of mean daily temperature from normal Mean daily temperature 0 9.5 0 5. Number of heating degree days -18 -4.5 16.5 6. Number of cooling degree days 18 4.5 -16.5 7. Hours of daylight Sunday 12 hr 27 min 12 hr 43 min 13 hr 44 min 8. Hours of daylight Monday 13 hr 26 min 13 hr 41 min 14 hr 37 min 9. Amount of daylight lost 1 min 2 min 7 min
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