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Chapter 9— RUNWAY VISUAL RANGE (RVR) 43
9.1. Introduction. ........................................................................................................... 43
9.2. Runway Visual Range Group (RDRDR[DR]/VRVRVRVRFT). ................................. 43
9.3. RVR Algorithms. ................................................................................................... 43
9.4. Standards and Reporting. ....................................................................................... 43
Table 9.1. RVR Reportable Values. ......................................................................................... 44
Table 9.2. Summary of RVR Observing and Reporting Standards. ........................................ 44
9.5. Manual Observing Methods. .................................................................................. 44
Chapter 10— PRESENT WEATHER 45
10.1. Introduction. ........................................................................................................... 45
10.2. Present Weather Group (w'w'). .............................................................................. 45
Table 10.1. Notations for Manually Reporting Present Weather. .............................................. 46
Table 10.2. Present Weather Reporting Order. .......................................................................... 47
10.3. Present Weather Qualifiers. ................................................................................... 47
10.4. Present Weather Capabilities of an FBWOS. ........................................................ 49
Table 10.3. Automated Present Weather Reporting. ................................................................. 49
10.5. Standards and Reporting. ....................................................................................... 49
10.6. Descriptors. ............................................................................................................ 50
10.7. Weather Phenomena. ............................................................................................. 50
10.8. Manual Observing ................................................................................................... 53
Table 10.4. Determining Precipitation Intensity. ....................................................................... 54
Table 10.5. Type and Frequency of Lightning. .......................................................................... 55
Figure 10.1. Thunderstorm Determination. ................................................................................. 56
Chapter 11— SKY CONDITION 58
11.1. Introduction. ........................................................................................................... 58
11.2. Sky Condition Group (NsNsNshshshs or VVhshshs or SKC or CLR). ...................... 58
Table 11.1. Increments of Reportable Values of Sky Cover Height. ......................................... 58
Table 11.2. Priority for Reporting Layers. ................................................................................. 58
11.3. Sky Condition Algorithms. .................................................................................... 59
