GNC 420(A) Pilot’s Guide and Reference
11-34
SECTION 11
ADDITIONAL FEATURES
190-00140-20 Rev. K
Standard Aviation Forecast Abbreviations
The standard aviation forecast abbreviations are listed
in Table 11-12.
STANDARD AVIATION FORECAST ABBREVIATIONS
‘+’ – (Heavy) ‘-’ – (Light)
‘/’ – (Missing or separator) Axxxx – Altimeter setting
(xxxx are numbers)
AFT – After BKN – Broken clouds
BLO – Below BR – Light fog
CIG – Ceiling CLR – Sky clear
DZ – Drizzle FEW – Few clouds
FG – Thick fog FM – From
FZ – Freezing G – Gusts
KT – Knots OBSCD – Obscured
OVC – Overcast clouds Pxxxx – Hourly Precipitation
(xxxx are numbers)
PRESFR – Pressure falling
rapidly
PRESRR – Pressure rising
rapidly
RA – Rain RMK – Remarks
SCT – Scattered clouds SLP – Sea Level Pressure
SM – Statue Miles SN – Snow
TEMPO – Occasionally Trrn – Terrain
TS – Thunderstorm VV – Vertical Visibility
Table 11-12 Forecast Abbreviations
METAR Graphics
The age symbols listed in Table 11-13 are common to
METARs, Winds, and Temperature/Dewpoint graphics:
METAR, Winds, and Temperature/Dewpoints Age
Graphics
0 - 10
minutes
(Green)
11 - 20
minutes
(Green)
21 - 30
minutes
(Green)
31 - 60
minutes
(Green)
61+
minutes
(Yellow)
Unknown
(Yellow)
Table 11-13 Weather Age Graphics
METARs
Precipitation Graphics
Light
(Green)
Moderate
(Green)
Heavy
(Yellow)
No
Precipitation
Rain
Snow
Unknown
Table 11-14 Precipitation Graphics
The symbol in Figure 11-48 indicates the ceiling at
KMWM is marginal VFR, with heavy snow and low IFR
visibility. The data age is 31-60 minutes old.
