|
Contraction
|
Definition
|
Usage
|
|
B
|
base leg
|
ATC
|
|
B
|
beginning
of precipitation (time in minutes) (weather reports only)
|
NWS
|
|
B
|
Bering
Standard Time (time groups only)
|
NWS
|
|
B
|
blue
|
GEN
|
|
B
|
center
clearance delivered
|
ATC
|
|
BA
|
braking
action
|
ICAO
|
|
BAC
|
below all
clouds
|
ATC
|
|
BACLIN
|
baroclinic
or baroclinic prognosis
|
NWS
|
|
BAFVC
|
bids
accepted for the following vacancies
|
GEN
|
|
BAL
|
balance
|
GEN
|
|
BASE
|
cloud base
|
GEN
|
|
BASOPS
|
Base
Operations Office
|
GEN
|
|
BATROP
|
barotropic
or barotropic prognosis
|
NWS
|
|
BC
|
back
course
|
GEN
|
|
BC
|
beginning
climb
|
ATC
|
|
BC
|
British Columbia
|
NWS
|
|
BC
|
patches
|
METAR
|
|
BCFG
|
fog
patches
|
NWS
|
|
BCH
|
beach
|
NWS
|
|
BCKG
|
backing
|
NWS
|
|
BCM
|
back
course marker
|
GEN
|
|
BCM
|
become
|
GEN
|
|
BCN
|
beacon
|
GEN
|
|
BCREQ
|
broadcast
requested
|
ATC
|
|
BCST
|
broadcast
|
GEN
|
|
BCSTN
|
broadcast
station
|
GEN
|
|
BDA
|
Bermuda
|
NWS
|
|
BDAT
|
beacon
data (digitized)
|
ATC
|
|
BDR
|
border
|
GEN
|
|
BDRY
|
boundary
|
ATC
|
|
BDSLD
|
bids
solicited
|
GEN
|
|
BECMG
|
becoming
(expected between 2 digit beginning hour and 2 digit ending hour)
|
TAF
|
|
BFDK
|
before
dark
|
NWS
|
|
BFR
|
before
|
GEN
|
|
BGN
|
began or begin
|
GEN
|
|
BGND
|
begin or
beginning descent
|
ATC
|
|
BHND
|
behind
|
GEN
|
|
BIFR
|
before
encountering IFR conditions
|
ATC
|
|
BINOVC
|
breaks in
overcast
|
NWS
|
|
BKN
|
broken
|
METAR
|
|
BL
|
blowing
|
METAR
|
|
BLD
|
build
|
NWS
|
|
BLDG
|
building
|
ICAO
|
|
BLDU
|
blowing
dust
|
METAR
|
|
BLDUP
|
buildup
|
NWS
|
|
BLKHLS
|
Black Hills
|
NWS
|
|
BLKT
|
blanket
|
NWS
|
|
BLN
|
balloon
|
GEN
|
|
BLO
|
below
|
GEN
|
|
BLO
|
below
clouds
|
ICAO
|
|
BLSA
|
blowing sand
|
METAR
|
|
BLSN
|
blowing
snow
|
METAR
|
|
BLW
|
below
|
ICAO
|
|
BLX
|
block
|
ATC
|
|
BLZD
|
blizzard
|
NWS
|
|
BMBR
|
bomber
|
GEN
|
|
BMS
|
basic
meteorological services
|
NWS
|
|
BND
|
bound
|
GEN
|
|
BNDRY
|
boundary
|
NWS
|
|
BNTH
|
beneath
|
GEN
|
|
BOMB
|
bombing
|
GEN
|
|
BOVC
|
base of
overcast
|
NWS
|
|
BPOC
|
before
proceeding on course
|
ATC
|
|
BPS
|
bytes per
second
|
GEN
|
|
BPT
|
beginning
procedure turn
|
ATC
|
|
BR
|
Bahama Route
|
ATC
|
|
BR
|
branch
|
GEN
|
|
BR
|
mist
|
METAR
|
|
BRAF
|
braking
action fair
|
GEN
|
|
BRAG
|
braking
action good
|
GEN
|
|
BRAN
|
braking
action nil
|
GEN
|
|
BRAP
|
braking
action poor
|
GEN
|
|
BRF
|
brief
|
NWS
|
|
BRG
|
bearing
|
GEN
|
|
BRGT
|
bright
|
GEN
|
|
BRITE
|
bright
radar indicator tower equipment
|
GEN
|
|
BRK
|
break
|
NWS
|
|
BRKG
|
braking
|
ICAO
|
|
BRKHIC
|
breaks in
higher overcast
|
NWS
|
|
BRKSHR
|
Berkshire
|
NWS
|
|
BRM
|
barometer
|
NWS
|
|
BS
|
commercial
broadcasting station
|
ICAO
|
|
BSAF
|
bids
solicited as follows
|
GEN
|
|
BSC
|
bird sweep
completed
|
ATC
|
|
BSHP
|
beginning
standard holding procedure
|
ATC
|
|
BSIAP
|
beginning
straightin approach
|
ATC
|
|
BSRAP
|
beginning
standard range approach
|
ATC
|
|
BSRO
|
begin
standard refuel orbit
|
ATC
|
|
BT
|
back
taxiing
|
ATC
|
|
BTL
|
between
layers
|
ICAO
|
|
BTN
|
between
|
ICAO
|
|
BTR
|
better
|
GEN
|
|
BTWN
|
between
|
NWS
|
|
BUEC
|
backup
emergency communication
|
GEN
|
|
BUIC
|
backup
interceptor control
|
ATC
|
|
BUL
|
bulletin
|
GEN
|
|
BUR
|
bureau
|
GEN
|
|
BUS
|
business
|
GEN
|
|
BY
|
blowing
spray (weather reports only)
|
METAR
|
|
BYD
|
beyond
|
GEN
|
|
BZR
|
buzzer
(radar)
|
GEN
|
