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RAFC
Regional Area Forecast Centre
WAFC
World Area Forecast Centre
MWO
Meteorological Watch Office
VAAC
Volcanic Ash Advisory Centre
ISA
ICAO Standard Atmosphere
DALR
Dry adiabatic lapse rate
SALR
Saturated adiabatic lapse rate
ELR
Enviromental lapse rate
Ci
Cirrus - high
Cc
Cirrocumulus - high
Cs
Cirrostratus
Ac
Altocumulus - middle
As
Altostratus - middle
Sc
Stratocumulus - low
St
Stratus - low
Ns
Nimbostratus - low
Cu
Cumulus - low
TCU
Towering cumulus
Cb
Cumulonimbus
SKC
Sky clear
FEW
Few (1 - 2 octas)
SCT
Scattered (3 - 4 octas)
BKN
Broken (5 - 7 octas)
OVC
Overcast (8 octas)
VV
Vertical visibility (indefinite ceiling)
CAVOK
Ceiling and visibility OK
DZ
Drizzle - Precipitation
RA
Rain - Precipitation
SN
Snow - Precipitation
SG
Snow Grains - Precipitation
IC
Ice Crystals - Precipitation
PL
Ice Pellets - Precipitation
GR
Hail - Precipitation
GS
Small Hail - Precipitation
UP
Unknown  - Precipitation
MI
Shallow - Descriptor
PR
Partial - Descriptor
BC
Patches - Descriptor
DR
Low Drifting - Descriptor
BL
Blowing - Descriptor
SH
Shower(s) - Descriptor
TS
Thunderstorm - Descriptor
FZ
Freezing - Descriptor
BR
Mist - Obscuration
FG
Fog - Obscuration
FU
Smoke - Obscuration
VA
Volcanic Ash - Obscuration
DU
Widespread Dust - Obscuration
SA
Sand - Obscuration
HZ
Haze - Obscuration
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