Abbreviations used in aviation forecasts and warnings

Abbreviations used in aviation forecasts and warnings

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

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 (produced with CAA approvaloutside normal operational hours)

B

BASE
Cloud base
BCFG
Fog patches
BECMG
Becoming
BKN
Broken (5 to 7 oktas)
BL
Blowing
BLW
Below
BR
Mist
BTN
Between

C

C
Degrees Celsius
CAT
Clear Air Turbulence
CAVOK
Ceiling and visibility OK
CB
Cumulonimbus
CC
Cirrocumulus
CI
Cirrus
CIT
Near or over large towns
CLD
Cloud
COR
Correction
COT
At the coast
CS
Cirrostratus
CU
Cumulus

D

D
Downward (tendency in RVR in Civil observations)
DEC
December
DEG
Degrees
DP
Dew point temperature
DR
Low drifting (followed by DU, SA or SN)
DS
Duststorm
DU
Dust (in suspension)
DUC
Dense upper cloud
DZ
Drizzle

E

E
East or easterly
ENE
East-north-east or east-north-easterly
ESE
East-south-east or east-south-easterly
EMBD
Embedded
ETA
Estimated time of arrival
ETD
Estimated time of departure

F

FC
Funnel cloud
FCST
Forecast
FEB
February
FEW
Few (1 or 2 oktas)
FG
Fog
FL
Flight level
FM...
From (followed by time weather changeis to begin)
FPM
Feet per minute
FRQ
Frequent
FT
Feet
FU
Smoke
FZ
Freezing (followed by DZ, FG or RA)

G

G
Gust
GEN
Generally
GND
Ground
GR
Hail (5 mm or more in diameter)
GS
Small hail or snow pellets

H

H
High pressure centre
HPA
Hectopascals (= Millibar)
HVY
Heavy
HZ
Haze

I

IC
Ice crystals (diamond dust)
ICE
Icing
INS
Inches (on F2309)
INTSF
Intensifying
IRVR
Instrumented RVR
ISOL
Isolated

J

JAN
January
JTST
Jet stream
JUL
July
JUN
Jun

K

KM
Kilometres
KMH
Kilometres per hour
KT
Knots

L

L
Low pressure centre
LAN
Inland (or over land)
LCA
Locally
LSQ
Line squall
LV
Light & variable (relating to wind)
LYR
Layer(s), layered

M

M
Less than 0 °C (temperature)
M
Less than the lowest reportable value(RVR)
M
Metres
MAR
March
MAX
Maximum
MB
Millibars
METAR
Aviation routine weather report
MI
Shallow (followed by FG)
MNM
Minimum
MOD
Moderate
MON
Above or covering mountains
MPS
Metres per second
MS
Minus
MSL
Mean sea level
MTW
Mountain waves

N

N
North or northerly
NAT
North Atlantic
NCD
No Cloud Detected (on AUTO METARs only)
NDV
No Directional Variation (on AUTO METARsonly)
NE
North-east or north-easterly
NIL
None
NM
Nautical miles
NNE
North-north-east or north-north-easterly
NNW
North-north-west or north-north-westerly
NOSIG
No significant change expected
NOTAM
Notice containing important aeronauticalinformation to all personnel concerned with flight operations
NOV
November
NS
Nimbostratus
NSC
No significant cloud
NSW
No significant weather
NW
North-west or north-westerly

O

OCNL
Occasional, occasionally
OCT
October
OVC
Overcast (8 oktas)

P

P
Greater than the highest reportable value(RVR)
PL
Ice pellets
PO
Dust devils
PRFG
Fog banks
PROB
Probability
PS
Plus
PSYS
Pressure System(s)

Q

QFE
Atmospheric pressure at specified datum
QNE
Aerodrome height expressed in pressurealtitude
QNH
Altimeter sub-scale setting to obtainelevation when on the ground

R

RA
Rain
RMK
Remarks
RVR
Runway visual range
RWY
Runway

S

S
South or southerly
SA
Sand (in suspension)
SC
Stratocumulus
SCT
Scattered (3 or 4 oktas)
SE
South-east or south-easterly
SEA
At sea
SEP
September
SEV
Severe
SFC
Surface
SG
Snow grains
SH...
Shower (followed by RA, SN, PL, GR, GSor combinations thereof)
SIG
Significant
SKC
Sky clear
SN
Snow (flakes)
SPECI
Aviation special weather report
SQ
Squall
SS
Sandstorm
SSE
South-south-east or south-south-easterly
SSW
South-south-west or south-south-westerly
ST
Stratus
STNR
Stationary
SW
South-west or south-westerly

T

T
Temperature
TAF
Terminal aerodrome forecast
TCU
Towering cumulus
TEMPO
Temporary, temporarily
TL
Until
TOP
Cloud top
TROP
Tropopause
TS
Thunderstorm (may also be followed byRA, SN, PL, GR, GS or combinations thereof)
TURB
Turbulence

U

U
Upward (tendency in RVR)
UP
Unidentified Precipitation (on AUTO METARsonly)
UTC
Co-ordinated Universal Time

V

VA
Volcanic ash
VAL
In valleys
VC...
In vicinity of aerodrome (followed byFG, FC, SH, PO, BLDU, BLSA, BLSN)
VIS
Visibility
VRB
Variable
VSP
Vertical speed

W

W
West or westerly
WAFC
World Area Forecast Centre
WDSPR
Widespread
WNW
West-north-west or west-north-westerly
WRNG
Warning
WS
Wind shear
WSPD
Wind speed
WSW
West-south-west or west-south-westerly
WX
Weather

Z

Z
Co-ordinated Universal Time

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Last updated: 14 November 2013