Training Guide in Surface Weather Observations - Multiple Choices

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a. Read right end of index in minimum thermometer. b. Unlock and slowly lower maximum thermometer; read top of mercury column. c. Whirl maximum thermometer until its reading agrees (within 1°) with reading at top of alcohol column on the minimum thermometer. d. Read this temperature from maximum after it has been whirled. e. Lock maximum thermometer in its set position. f. Invert minimum until index drops to end of alcohol column. g. Return minimum to its nearly horizontal position. Figure 6-6. Reading and Setting Thermometers 6-9
6.7.3 Reading and Setting the Minimum Thermometer The minimum temperature is the reading at the right end of the index farthest from the bulb, not the reading on the alcohol column (see Figure 6-7). Part (a) of Figure 6-7 shows the top of the alcohol column some distance to the right of the index. In part (b), the alcohol column has retreated with falling temperature until the top just touches the index. Further cooling moves the bulb (to the left). As the temperature rises again, the alcohol column moves toward the right without moving the index. Part (c) shows an incorrect reading with the index trapped in the broken alcohol column. 6-10 Figure 6-7. Index on Minimum Thermometer. Read the thermometer to the nearest 1/10 of a degree, before moving it from the almost horizontal position in which it was set at the time of the last observation and before reading the maximum thermometer. To set the minimum thermometer, point the bulb end upward. Allow the index to fall to the end of the alcohol column. Then turn the thermometer counterclockwise until it stops. The bulb end will now be slightly lower than horizontal. 6.7.4 Reading and Setting the Maximum Thermometer The highest temperature occurring since the maximum temperature was previously set is the reading at the top of the mercury column, taken with the bulb end lowered. Carefully release the support catch back of the clamp and lower the bulb end of the thermometer slowly until the thermometer is vertical and the mercury column is resting on the constriction. Stand as far from the thermometer as possible to prevent body heat from changing the readings. Do not touch the bulb of the thermometer. Be sure that the line of sight from your eye to the top of the mercury column is level to avoid parallax error (see Figure 6-8) and read the temperature to the nearest 1/10 of a degree.
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Training Guide in Surface Weather O
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PREFACE METAR/SPECI is the internat
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CHAPTER 7 - PRESSURE ..............
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1.2 Content and Format of the Manua
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1.6 Report Modifier - COR An observ
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1-6
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12. A METAR observation contains se
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25. At no time shall an observation
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2.1.4 Estimated Winds Though winds
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2-4
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Code the following wind situations
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19. Which of the following wind par
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3.1 Visibility 1 CHAPTER 3 VISIBILI
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3.2.3 Surface and Tower Visibility
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SUR- FACE VISIBILITY PRESENT WEATHE
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3.3 Visibility Chart As an aid for
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OUTLINE DETERMINING VISIBILITY From
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REVIEW QUESTIONS Select the best an
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11. 12. At the time of observation,
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23. Weather conditions being equal,
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38. Visibility of 2 3/8 miles is re
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When more than one type of present
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4.1.2 Descriptors Descriptors are q
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Obscurations that stand alone, i.e.
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Question: What does an observer do
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Page 54 and 55: 9. +FZRA a. Severe freezing rain b.
Page 56 and 57: 23. Volcanic ash is reported: a. wh
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Page 60 and 61: 46. Which of the following precipit
Page 62 and 63: 59. Steady rain is observed 4 miles
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Page 66 and 67: 5.2 Sky Cover Figure 5-2. Weather O
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Page 70 and 71: Figure 5-4. Advancing Layer (sky co
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Page 74 and 75: Figure 5-10. Surface-base Layer Sur
Page 76 and 77: Example 5-5. Four Layers. The follo
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Page 80 and 81: 1 CU - Cumulus 1 Example 5-12. Mult
Page 82 and 83: layer aloft will be considered as m
Page 84 and 85: 5. When a balloon is used for deter
Page 86 and 87: OUTLINE DETERMINING SKY COVER AMOUN
Page 88 and 89: Select the correct answer. REVIEW Q
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Page 94 and 95: 6.1 Temperature and Dew Point - T
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Page 98 and 99: Other examples of determining wet-b
Page 100 and 101: The conversion from ice to water ca
Page 104 and 105: Figure 6-8. Reading a Thermometer t
Page 106 and 107: TIME G LST G UTC (2) TEMP. (°C) DE
Page 108 and 109: Method II: Centrifugal Force A shor
Page 110 and 111: INSTRUCTIONS: Select the best answe
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Page 122 and 123: 7. Sea-level pressure is an adjustm
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Page 134 and 135: 10. A thunderstorm is overhead, mov
Page 136 and 137: 26. A 6-hourly maximum temperature
Page 138 and 139: CHAPTER 9 REVIEW EXERCISES OBSERVIN
Page 140 and 141: Exercise #3 Lower layer has ____/8t
Page 142 and 143: Exercise #5 Surface based layer has
Page 144 and 145: Exercise #7 Total sky coverage is _
Page 146 and 147: Exercise #9 Lower layer has ____/8t
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Page 150 and 151: QUALITY CONTROL EXERCISE Each of th
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21. METAR KKKK 282045Z E29006KT 7SM
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42. METAR KFFF 302250Z 03008KT 40SM
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16. a. METAR 17. b. second 18. d. f
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11. - a change in wind direction of
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...unfocused lights of moderate int
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22. b precipitation occurring not a
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52. b. decreasing dominance. 53. b.
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24. 8 VV 25. 8 OVC 26. 7 BKN 27. as
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A-14
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A-16
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A-18
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18. 1200 UTC or other time modified
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9. Lower layer has 1 /8ths coverage
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16. METAR KFFF 312148Z 36005KT 1 1/
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43. METAR KGGG 052145Z 05009KT 4SM
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WET BULB TEMPERATURES 31 32 33 34 3
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WS Form B-11 (12-96) Pres. by WSOH
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C-3
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. If an altimeter setting indicator
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