Federal Meteorological Handbook No. 1 - Marrella

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Table 6-1. Reportable Visibility Values Source of Visibility Report Automated Manual a M1/4 2 9 0 5/8 1 5/8 4 12 1/4 2 1/2 10 1/16 1 3/4 5 13 1/2 3 1/8 7/8 1 7/8 6 14 3/4 4 3/16 1 2 7 15 1 5 1/4 1 1/8 2 1/4 8 20 a 1 1/4 6 5/16 1 1/4 2 1/2 9 25 1 1/2 7 3/8 1 3/8 2 3/4 10 30 a 1 3/4 8 1/2 b 1 1/2 3 11 35 a. These values may not be reported by some automated stations. b. Further values in increments of 5 statute miles may be reported, i.e., 40, 45, 50, etc. 6.6 Summary of Visibility Observing and Reporting Standards Table 6-2 summarizes the applicability of visibility standards. Table 6-2. Summary of Visibility Observing and Reporting Standards and Procedures Visibility Surface Variable �� 3/4 Type of Station Automated Manual Represents 10-minutes of sensor Visual evaluation of outputs. visibility around the horizon. Reported when the prevailing visibility varies by 1/2 mile or more and the visibility is less than 3 miles. Tower Augmented. Reported at stations with an ATCT. Sector <strong>No</strong>t reported. Reported at all stations.
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Page 13 and 14: 1.1 Purpose CHAPTER 1 INTRODUCTION
Page 15 and 16: 1.8 Unforeseen Requirements No set
Page 17 and 18: Manual and augmented weather observ
Page 19 and 20: a. Accuracy of Time in Reports. A p
Page 21 and 22: CHAPTER 3 CERTIFICATION AND QUALITY
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Page 27 and 28: Table 5-1. Estimating Wind Speed Kn
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Page 47 and 48: 10.1 General CHAPTER 10 TEMPERATURE
Page 49 and 50: 11.1 General CHAPTER 11 PRESSURE At
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Federal Meteorological Handbook No. 1 - Marrella

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