Training Guide in Surface Weather Observations - Multiple Choices

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Other examples of determining wet-bulb depression: Dry-Bulb - Wet-Bulb = Depression 75.6 58.3 17.3 38.2 37.8 0.4 4.3 1.2 5.5 8.7 10.2 1.5 Use the wet-bulb temperature and the wet-bulb depression to obtain the dew point. After obtaining the depression, ignore the dry-bulb temperature. Do not make the common mistake of using the dry-bulb temperature in calculating the dew point. Computing dew point using the high range scale: (Dry-Bulb = 85.7°F) - (Wet-Bulb = 70.6°F) = (Depression = 15.1°F) 1. Align the “0” index of the “D” scale with the wet-bulb reading on the “DP” scale = 70.6°F 2. Align the cursor with the wet-bulb depression using the nearest station pressure ring of the “D” scale = 15.1 3. Follow the cursor out to the “DP” scale and read the dew point temperature: P=30 = 63.2°F converted to Celsius = 17.3°C; entered in column 12 as 17. Computing dew point using the low range scale: Frozen Wick (Dry-Bulb = 30.1°F) - (Wet-Bulb = 27.8°F) = (Depression = 2.3°F) 1. Align the “0" index of the “D” scale with the wet-bulb reading on the “Ti” scale (inner temperature ring) = 27.8°F 2. Align the cursor with the wet-bulb depression using the nearest station pressure ring of the “D” scale = 2.3 3. Follow the cursor out to the “DP” scale (outer temperature ring) and read the dew point temperature: P=30 = 22.8°F converted to Celsius = 5.1; entered in column 12 as 05. Computing dew point using the low range scale: Unfrozen Wick (Dry-Bulb = 32.4°F) - (Wet-Bulb = 29.1°F) = (Depression = 3.3°F) 1. Align the “0" index of the “D” scale with the wet-bulb reading on the “DP” scale (outer temperature ring) = 29.1°F 2. Align the cursor with the wet-bulb depression using the nearest station pressure ring of the “D” scale = 3.3 3. Follow the cursor out to the “DP” scale (outer temperature ring) and read the dew point temperature: P=30 = 23.0°F converted to Celsius = 5.0; entered in column 12 as 05. 6-5
Figure 6-3. Psychrometric Calculator. Both the tables and psychrometric calculator are designed to give you the dew point with respect to water, which is the value always reported in the aviation weather observation. The dew point can also be determined with respect to ice, but this will concern you only if: 1. The wick of the wet-bulb is covered with ice and you cannot get a depression (the dry- and wet-bulb readings are the same), or 2. Freezing fog (FZFG) is present. When the wick is covered with ice and you are unable to get a depression, consider the dew point with respect to ice to be the same as the dry-bulb temperature and convert it to the dew point with respect to water. However, if this condition exists and fog (not freezing fog) is present, assume the dew point with respect to water to be the same as the dry-bulb temperature. Whenever freezing fog is present, assume that the dew point with respect to ice is the same as the dry-bulb temperature, and convert it to the dew point with respect to water. If the temperature is 30°F or below, there is no need to determine the wetbulb temperature. 6-6
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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
Page 48 and 49: Obscurations that stand alone, i.e.
Page 50 and 51: Question: What does an observer do
Page 52 and 53: Footnotes for Weather Phenomena Mat
Page 54 and 55: 9. +FZRA a. Severe freezing rain b.
Page 56 and 57: 23. Volcanic ash is reported: a. wh
Page 58 and 59: 37. Match the following present wea
Page 60 and 61: 46. Which of the following precipit
Page 62 and 63: 59. Steady rain is observed 4 miles
Page 64 and 65: 72. Rain showers of an unknown inte
Page 66 and 67: 5.2 Sky Cover Figure 5-2. Weather O
Page 68 and 69: Example 5-2. One Layer with Single
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
Page 78 and 79: Example 5-8. One Layer. Example 5-9
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
Page 90 and 91: 20. If a layer aloft has less than
Page 92 and 93: 40. Match the following reportable
Page 94 and 95: 6.1 Temperature and Dew Point - T
Page 96 and 97: 6. Obtain the difference between th
Page 100 and 101: The conversion from ice to water ca
Page 102 and 103: a. Read right end of index in minim
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
Page 112 and 113: 16. Under what conditions is the de
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Page 118 and 119: The altimeter setting shall be repo
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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 _
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Exercise #11 Total sky coverage is
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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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Training Guide in Surface Weather Observations - Multiple Choices

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