PI-135 OPERATOR’S MANUAL
120
AERODROME ACTUAL WEATHER METAR AND
SPECI DECODE
Identifi cation
CCCC
GGggZ
ICAO four -letter location indicator
In individual messages, time of observation in hours
(GG) and minutes (gg) UTC
Indicator (Z) of UTC
Visibility
WW
Minimum horizontal visibility in meters
9999 = 10 km or more
CAVOK
Cloud And Visibility OK. Replaces visibility RVR, present weather
and cloud if: 1. Visibility is 10 km or more 2. No cumulonimbus
cloud and no cloud below 1500 meters (5000 ft)
or below the highest minimum sector altitude whichever is greater,
and 3. No precipitation, thunderstorm, sandstorm, shallow fog or
low drifting dust, sand or snow
Temperature in whole degrees Celsius
(if below 0° C preceded by M)
Temp and
Dew Point
T
1
T
1
/T
1
d
T
1
d
Dew-point temperature in whole degrees Celsius
(if below 0° C preceded by M)
Pressure
Q P
H
P
H
P
H
P
H
Indicator of QNH in hectopascals
If Q = A then QNH is in inches
QNH in whole hectopascals or inches, tenths and
hundredths of an inch depending on indicator
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