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BLKTS
Blankets
BLO
Below or below
clouds
BLW
Below
BLZD
Blizzard
BN
Blowing sand
BND
Bound
BNDRY
Boundary
BNDRYS
Boundaries
BNTH
Beneath
BOOTHEEL
Bootheel
BR
Branch or mist
(METAR, used only
for visibility between
5/8 and 6 miles)
BRF
Brief
BRG
Branching
BRK
Break
BRKG
Breaking
BRKHIC
Breaks in higher
clouds
BRKS
Breaks
BRKSHR
Berkshire
BRKSHRS
Berkshires
BRM
Barometer
BRN
Bulk Richardson
Number
BRS
Branches
BS
Blowing snow
BTWN
Between
BWER
Bounded weak
echo region
BYD
Beyond
C
Celsius
CA
California or cloud-
to-air lightning in
PIREPs
CAA
Cold air advection
CAPE
Convective available
potential energy
CARIB
Caribbean
CAS
Committee for
Aviation Services
CASCDS
Cascades
Rev 2 Apr/2004
Common Weather Abbreviations
CAT
CAVOK
CAVU
CB
CBMAM
CC
CCCC
CCL
CCLDS
CCLKWS
CCSL
CCx
CDFNT
CDFNTL
CFP
CG
CHC
CHCS
CHG
CHGD
CHGG
CHGS
CHI
CHINO
CHOP
CHSPK
CI
B-3
Clear air turbulence
Ceiling and visibility
OK
Ceiling and visibility
unlimited
Cumulonimbus
Cumulonimbus
Mammatus clouds
Cirrocumulus
Generic WMO format
code group for a
four-letter location
identifier
Convective conden-
sation level
Clear of clouds
Counterclockwise
Cirrocumulus
standing lenticular
Code used in the
WMO abbreviated
heading to indicate
a corrected forecast,
where x is the letter
A through X
Cold front
Cold frontal
Cold front passage
Cloud to ground
(lightning)
Chance
Chances
Change
Changed
Changing
Changes
Cloud-Height
indicator
Sky condition at
secondary location
not available
Turbulence type
characterized by
rapid, rhythmic jolts
Chesapeake
Cirrus
KMD 250 Pilot's Guide
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