Quantcast Figure 1-8. Visibility Values Reportable in METAR

 

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CHAPTER ONE
METEOROLOGY FLIGHT PLANNING
NOTE:
Other types of visibility are reported in the RMK portion of the
METAR/SPECI (see the remarks section later in this chapter). At
military stations tower visibility will be reported when either
surface or tower visibility is four miles or less. This visibility will
be a remark with the surface visibility remaining in the body of the
report.
Source of Visibility Report
Automated
Manual
M1/4
2
9
0
5/8
1 5/8
4
12
1/4
2 1/2
10
1/16
3/4
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
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
1 3/4
8
1/2
1 1/2
3
11
35a
a. Further values in increments of 5 statute miles may be reported (i.e., 40, 45, 50, etc.)
Figure 1-8 Visibility Values Reportable in METAR
Group 6: Runway Visual Range (RVR)
The runway visual range (RVR), defined in Chapter Five, is a measure of the horizontal visibility
as determined from instruments (transmissometers) located alongside and about 14 feet higher
than runway centerline. They are calibrated with reference to the sighting of either high-intensity
runway lights or the visual contrasts of other targets, whichever yields the greater visual range.
Only activities with operational equipment are allowed to report RVR.
RVR is reported whenever the prevailing visibility is one statute mile or less and/or the RVR for
the designated instrument runway is 6000 feet or less. RVR is measured in increments of
200 feet through 3000 feet and in 500-foot increments above 3000 feet (Figure 1-9).
1-8  AVIATION ROUTINE WEATHER REPORTS AND TERMINAL AERODROME
FORECASTS


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