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CAS
Committee for
Aviation Services
CASCDS
Cascades
CAT
Clear air turbulence
CAVOK
Clear sky, unlimited
visibility
CB
Cumulonimbus
CBMAM
Cumulonimbus
Mammatus clouds
CC
Cirrocumulus
CCCC
Generic WMO
format code group
for a four-letter loca-
tion identifier
CCLDS
Clear of clouds
CCLKWS
Counterclockwise
CCSL
Cirrocumulus
standing lenticular
CCx
Code used in the
WMO abbreviated
heading to indicate
a corrected fore-
cast, where x is the
letter A through X
CDFNT
Cold front
CFP
Cold front passage
CG
Cloud to ground
(lightning)
CHC
Chance
CHCS
Chances
CHG
Change
CHGD
Changed
CHGG
Changing
CHGS
Changes
CHI
Cloud-Height
indicator
Revision 2 Nov/2002
CHINO
CHOP
CHSPK
CI
CIG
CIGS
CLD
CLDNS
CLDS
CLKWS
CLR
CLRG
CLRS
CMPLX
CNCL
CNCLD
CNCLG
CNCLS
CNDN
CNTR
CNTRD
CNTRL
CNTY
CNTYS
CNVG
CNVGG
CNVGNC
CNVTN
CNVTV
KMD 550/850 FIS Addendum
B-4
Sky condition at
secondary location
not available
Turbulence type
characterized by
rapid, rhythmic jolts
Chesapeake
Cirrus
Ceiling
Ceilings
Cloud
Cloudiness
Clouds
Clockwise
Clear
Clearing
Clears
Complex
Cancel
Canceled
Canceling
Cancels
Canadian
Center
Centered
Central
County
Counties
Converge
Converging
Convergence
Convection
Convective
Appendix B
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