- $
maintenance check indicator
- –
light intensity
- +
heavy intensity
- /
indicator that visual range data follows; separator between temperature and dew point data.
- ACC
altocumulus castellanus
- ACFT MSHP
aircraft mishap
- ACSL
altocumulus standing lenticular cloud
- ALP
airport location point
- AO1
automated station without precipitation discriminator
- AO2
automated station with precipitation discriminator
- APRNT
apparent
- APRX
approximately
- ATCT
airport traffic control tower
- AUTO
automated report
- B
began
- BC
patches
- BKN
broken
- BL
blowing
- BR
mist
- C
center (with reference to runway designation)
- CA
cloud-air lightning
- CB
cumulonimbus cloud
- CBMAM
cumulonimbus mammatus cloud
- CC
cloud-cloud lightning
- CCSL
cirrocumulus standing lenticular cloud
- CG
cloud-ground lightning
- CHI
cloud-height indicator
- CHINO
sky condition at secondary location not available
- CIG
ceiling
- CLR
clear
- CONS
continuous
- COR
correction to a previously disseminated report
- DOC
Department of Commerce
- DOD
Department of Defense
- DOT
Department of Transportation
- DR
low drifting
- DS
duststorm
- DSNT
distant
- DU
widespread dust
- DZ
drizzle
- E
east, ended
- FAA
Federal Aviation Administration
- FC
funnel cloud
- FEW
few clouds
- FG
fog
- FIBI
filed but impracticable to transmit
- FIRST
first observation after a break in coverage at manual station
- FROPA
frontal passage
- FRQ
frequent
- FT
feet
- FU
smoke
- FZ
freezing
- FZRANO
freezing rain sensor not available
- G
gust
- GR
hail
- GS
small hail and/or snow pellets
- HZ
haze
- IC
ice crystals, in-cloud lightning
- ICAO
International Civil Aviation Organization
- KT
knots
- L
left (with reference to runway designation)
- LAST
last observation before a break in coverage at a manual station
- LST
Local Standard Time
- LTG
lightning
- LWR
lower
- M
minus, less than
- METAR
aviation routine weather report
- MI
shallow
- MOV
moved/moving/movement
- MT
mountains
- N
north
- N/A
not applicable
- NCDC
National Climatic Data Center
- NE
northeast
- NOS
National Ocean Service
- NOSPECI
no SPECI reports are taken at the station
- NW
northwest
- NWS
National Weather Service
- OCNL
occasional
- OFCM
Office of the Federal Coordinator for Meteorology
- OVC
overcast
- OHD
overhead
- P
greater than
- PE
ice pellets
- PK WND
peak wind
- PNO
precipitation amount not available
- PO
dust/sand whirls (dust devils)
- PR
partial
- PRESFR
pressure falling rapidly
- PRESRR
pressure rising rapidly
- PWINO
precipitation identifier sensor not available
- PY
spray
- R
right (with reference to runway designation)
- RA
rain
- RVR
Runway Visual Range
- RVRNO
RVR system not available
- RWY
runway
- S
south
- SA
sand
- SCSL
stratocumulus standing lenticular cloud
- SCT
scattered
- SE
southeast
- SFC
surface
- SG
snow grains
- SH
shower(s)
- SKC
sky clear
- SLP
sea-level pressure
- SLPNO
sea-level pressure not available
- SM
statute miles
- SN
snow
- SNINCR
snow increasing rapidly
- SPECI
an unscheduled report taken when certain criteria have been met
- SQ
squalls
- SS
sandstorm
- SW
southwest
- TCU
towering cumulus
- TS
thunderstorm
- TSNO
thunderstorm information not available
- TWR
tower
- UP
unknown precipitation
- UTC
Coordinated Universal Time
- V
variable
- VA
volcanic ash
- VC
in the vicinity
- VIS
visibility
- VISNO
visibility at secondary location not available
- VRB
variable
- VV
vertical visibility
- W
west
- WG/SO
Working Group for Surface Observations
- WMO
World Meteorological Organization
- WND
wind
- WSHFT
wind shift
- Z
zulu, i.e., Coordinated Universal Time