CLOUD AMOUNT ABBREVIATIONS (EXCEPT CB)

ABBRIVIATION	TERM
SKC	Sky clear (0 oktas)
FEW	Few (1-2 oktas)
SCT	Scattered (3-4 oktas)
BKN	Broken (5-7 oktas)
OVC	Overcast (8 oktas)

METAR ABBREVIATIONS

VFR	Visual Flight Rules
MVFR	Marginal Visual Flight Rules
IFR	Instrument Flight Rules
LIFR	Lower Instrument Flight Rules

CB AMOUNT ABBREVIATIONS

ISOL	Isolated - for individual CB clouds
OCNL	Occasional - for well-separated CB clouds
FRQ	Frequent - for CB clouds with little or no separation
EMBD	Embedded - CB clouds contained in layers of other clouds

COMMON MET ABBREVIATIONS

+	Heavy
-	Light
AC	Altocumulus
AD	Aerodrome
AGL	Above ground level
AMD	Amend or amended
AMSL	Above mean sea level
APR	April
AS	Altostratus
ASR	Altimeter setting region
AUG	August
AUTO	Automated METAR
BASE	Cloud base
BCFG	Fog patches
BECMG	Becoming
BKN	Broken (5 to 7 oktas)
BL	Blowing
BLO	Below clouds
BLW	Below
BR	Mist
BTN	Between
C	Degrees Celsius
CAT	Clear Air Turbulence
CAVOK	Ceiling and visibility OK

MPS	Meters per second
AO1	Automated Observation without precipitation discriminator (rain/snow)
AO2	Automated Observation with precipitation discriminator (rain/snow)
AMD	Amended Forecast (TAF)
BECMG	Becoming (expected between 2 digit beginning hour and 2 digit ending hour)
BKN	Broken (5-7 oktas)
CLR	Clear at or below 12,000 feet (AWOS/ASOS report)
COR	Correction to the observation
FEW	1 or 2 octas (eighths) cloud coverage
FEW	1 or 2 oktas (eighths) cloud coverage
FM	From (4 digit beginning time in hours and minutes)
LDG	Landing
M	In temperature field means "minus" or below Zero
M	In RVR listing indicates visibility less than lowest reportable sensor value (eg. M600)
NO	Not available (eg SLPNO, RVRNO)
NSW	No Significant Weather
OVC	Overcast (8 oktas)
9999	Visibility in meters (9999 means greater than 10 km)
P	In RVR indicates visibility greater than highest reportable sensor value (eg P6000FT)
P6SM	Visibility greater than 6 SM (TAF only)
PROB4O	Probability 40 percent
R	Runway (used in RVR measurement)
RMK	Remark
RY/RWY	Runway
SCT	Scattered (3-4 oktas)
SKC	Sky Clear (0 oktas)
SLP	Sea Level Pressure (eg., 1013 reported as 013)
SM	Statute mile(s)
SPECI	Special Report
TEMPO	Temporary changes expected (between 2 digit beginning hour and 2 digit ending hour)
TKOF	Takeoff
T01760158, 10142, 20012 and 401120084	In Remarks examples of temperature information
V	Varies (wind direction and RVR)
VC	Vicinity
VRB	Variable wind direction when speed is less than or equal to 6 knots
VV	Vertical Visibility (Indefinite Ceiling)
WS	Wind shear (In TAFs, low level and not associated with convective activity)
ATIS	automatic terminal information service
ft	feet
km	unit of distance
kt	knots
MET	meteorology or meteorological
METAR	routine aviation aerodrome weather report
RVR	runway visual range