- AAWU: Alaskan Aviation Weather Unit
- ABNDT: Abundant
- ABNML: Abnormal
- ABT: About
- ABV: Above
- AC: Convective outlook or altocumulus
- ACC: Altocumulus castellanus
- ACCUM: Accumulate
- ACFT: Aircraft
- ACLT: Accelerate
- ACLTD: Accelerated
- ACLTG: Accelerating
- ACLTS: Accelerates
- ACPY: Accompany
- ACRS: Across
- ACSL: Altocumulus standing lenticular
- ACTV: Active
- ACTVTY: Activity
- ACYC: Anticyclone
- ADJ: Adjacent
- ADL: Additional
- ADQT: Adequate
- ADQTLY: Adequately
- ADRNDCK: Adirondack
- ADVCT: Advect
- ADVCTD: Advected
- ADVCTG: Advecting
- ADVCTN: Advection
- ADVCTS: Advects
- ADVN: Advance
- ADVNG: Advancing
- ADVY: Advisory
- ADVYS: Advisories
- AFCT: Affect
- AFCTD: Affected
- AFCTG: Affecting
- AFDK: After dark
- AFOS: Automated Field Operations System
- AFSS: Automated Flight Service Station
- AFT: After
- AFTN: Afternoon
- AGL: Above ground level
- AGN: Again
- AGRD: Agreed
- AGRMT: Agreement
- AGRS: Agrees
- AHD: Ahead
- AK: Alaska
- AL: Alabama
- ALF: Aloft
- ALG: Along
- ALGHNY: Allegheny
- ALQDS: All quadrants
- ALSTG: Altimeter setting
- ALT: Altitude
- ALTA: Alberta
- ALTHO: Although
- ALTM: Altimeter
- ALUTN: Aleutia
- AMD: Amend
- AMDD: Amended
- AMDG: Amending
- AMDT: Amendment
- AMP: Amplify
- AMPG: Amplifying
- AMPLTD: Amplitude
- AMS: Air mass
- AMT: Amount
- ANLYS: Analysis
- ANS: Answer
- AOA: At or above
- AOB: At or below
- AP: Anomalous Propagation
- APCH: Approach
- APCHG: Approaching
- APCHS: Approaches
- APLCN: Appalachian
- APLCNS: Appalachians
- APPR: Appear
- APPRG: Appearing
- APPRS: Appears
- APRNT: Apparent
- APRNTLY: Apparently
- APRX: Approximate
- APRXLY: Approximately
- AR: Arkansas
- ARL: Air Resources Lab
- ARND: Around
- ARPT: Airport
- ASAP: As soon as possible
- ASSOCD: Associated
- ASSOCN: Association
- ATLC: Atlantic
- ATTM: At this time
- ATTN: Attention
- AVBL: Available
- AVG: Average
- AVN: Aviation model
- AWC: Aviation Weather Center
- AWT: Awaiting
- AZ: Arizona
- AZM: Azimuth
- BACLIN: Baroclinic
- BAJA: Baja, California
- BATROP: Barotropic
- BC: British Columbia
- BCH: Beach
- BCKG: Backing
- BCM: Become
- BCMG: Becoming
- BCMS: Becomes
- BDA: Bermuda
- BDRY: Boundary
- BFDK: Before dark
- BFR: Before
- BGN: Begin
- BGNG: Beginning
- BGNS: Begins
- BHND: Behind
- BINOVC: Breaks in overcast
- BKN: Broken
- BLD: Build
- BLDG: Building
- BLDUP: Buildup
- BLKHLS: Black Hills
- BLKT: Blanket
- BLKTG: Blanketing
- BLKTS: Blankets
- BLO: Below clouds
- BLW: Below
- BLZD: Blizzard
- BN: Blowing sand
- BND: Bound
- BNDRY: Boundary
- BNDRYS: Boundaries
- BNTH: Beneath
- BOOTHEEL: Bootheel
- BR: Branch
- BRF: Brief
- BRK: Break
- BRKG: Breaking
- BRKHIC: Breaks in higher clouds
- BRKS: Breaks
- BRKSHR: Berkshire
- BRM: Barometer
- BS: Blowing snow
- BTWN: Between
- BYD: Beyond
- C: Celsius
- CA: California
- CAA: Cold air advection
- CARIB: Caribbean
- CASCDS: Cascades
- CB: Cumulonimbus
- CC: Cirrocumulus
- CCLDS: Clear of clouds
- CCLKWS: Counterclockwise
- CCSL: Cirrocumulus standing lenticular
- CDFNT: Cold front
- CEP: Central Operations
- CFP: Cold front passage
- CHC: Chance
- CHCS: Chances
- CHG: Change
- CHGD: Changed
- CHGG: Changing
- CHGS: Changes
- CHSPK: Chesapeake
- CI: Cirrus
- CIG: Ceiling
- CIGS: Ceilings
- CLD: Cloud
- CLDNS: Cloudiness
- CLDS: Clouds
- CLKWS: Clockwise
- CLR: Clear
- CLRG: Clearing
- CLRS: Clears
- CMPLX: Complex
- CNCL: Cancel
- CNCLD: Canceled
- CNCLG: Canceling
- CNCLS: Cancels
- CNDN: Canadian
- CNTR: Center
- CNTRD: Centered
- CNTRL: Central
- CNTY: County
- CNTYS: Counties
- CNVG: Converge
- CNVGG: Converging
- CNVGNC: Convergence
- CNVTN: Convection
- CNVTV: Convective
- CNVTVLY: Convectively
- CO: Colorado
- COMPR: Compare
- COMPRD: Compared
- COMPRG: Comparing
- COMPRS: Compares
- COND: Condition
- CONFDC: Confidence
- CONT: Continue
- CONTD: Continued
- CONTDVD: Continental Divide
- CONTG: Continuing
- CONTLY: Continually
- CONTRAILS: Condensation trails
- CONTS: Continues
- CONUS: Continental U.S.
- COORD: Coordinate
- COR: Correction
- CPBL: Capable
- CRC: Circle
- CRLC: Circulate
- CRLN: Circulation
- CRNR: Corner
- CRNRS: Corners
- CRS: Course
- CS: Cirrostratus
- CSDR: Consider
- CSDRBL: Considerable
- CST: Coast
- CSTL: Coastal
- CT: Connecticut
- CTGY: Category
- CTSKLS: Catskills
- CU: Cumulus
- CUFRA: Cumulus fractus
- CVR: Cover
- CVRD: Covered
- CVRG: Covering
- CVRS: Covers
- CWSU: Center Weather Service Units
- CYC: Cyclonic
- CYCLGN: Cyclogenesis
- DABRK: Daybreak
- DALGT: Daylight
- DBL: Double
- DC: District of Columbia
- DCR: Decrease
- DCRD: Decreased
- DCRG: Decreasing
- DCRGLY: Decreasingly
- DCRS: Decreases
- DE: Delaware
- DEG: Degree
- DEGS: Degrees
- DELMARVA: Delaware Maryland Virginia
- DFCLT: Difficult
- DFCLTY: Difficulty
- DFNT: Definite
- DFNTLY: Definitely
- DFRS: Differs
- DFUS: Diffuse
- DGNL: Diagonal
- DGNLLY: Diagonally
- DIGG: Digging
- DIR: Direction
- DISC: Discontinue
- DISCD: Discontinued
- DISCG: Discontinuing
- DISRE: Disregard
- DISRED: Disregarded
- DISREG: Disregarding
- DKTS: Dakotas
- DLA: Delay
- DLAD: Delayed
- DLT: Delete
- DLTD: Deleted
- DLTG: Deleting
- DLY: Daily
- DMG: Damage
- DMGD: Damaged
- DMGG: Damaging
- DMNT: Dominant
- DMSH: Diminish
- DMSHD: Diminished
- DMSHG: Diminishing
- DMSHS: Diminishes
- DNS: Dense
- DNSLP: Downslope
- DNSTRM: Downstream
- DNWND: Downwind
- DP: Deep
- DPND: Deepened
- DPNG: Deepening
- DPNS: Deepens
- DPR: Deeper
- DPTH: Depth
- DRFT: Drift
- DRFTD: Drifted
- DRFTG: Drifting
- DRFTS: Drifts
- DRZL: Drizzle
- DSCNT: Descent
- DSIPT: Dissipate
- DSIPTD: Dissipated
- DSIPTG: Dissipating
- DSIPTN: Dissipation
- DSIPTS: Dissipates
- DSND: Descend
- DSNDG: Descending
- DSNDS: Descends
- DSNT: Distant
- DSTBLZ: Destabilize
- DSTBLZD: Destabilized
- DSTBLZG: Destabilizing
- DSTBLZN: Destabilization
- DSTBLZS: Destabilizes
- DSTC: Distance
- DTRT: Deteriorate
- DTRTD: Deteriorated
- DTRTG: Deteriorating
- DTRTS: Deteriorates
- DURC: During climb
- DURD: During descent
- DURG: During
- DURN: Duration
- DVLP: Develop
- DVLPD: Developed
- DVLPG: Developing
- DVLPMT: Development
- DVLPS: Develops
- DVRG: Diverge
- DVRGG: Diverging
- DVRGNC: Divergence
- DVRGS: Diverges
- DVV: Downward vertical velocity
- DWNDFTS: Downdrafts
- DWPNT: Dew point
- DWPNTS: Dew points
- E: East
- EBND: Eastbound
- EFCT: Effect
- ELNGT: Elongate
- ELNGTD: Elongated
- ELSW: Elsewhere
- EMBDD: Embedded
- EMERG: Emergency
- ENCTR: Encounter
- ENDG: Ending
- ENE: East northeast
- ENELY: East northeasterly
- ENERN: East northeastern
- ENEWD: East northeastward
- ENHNC: Enhance
- ENHNCD: Enhanced
- ENHNCG: Enhancing
- ENHNCMNT: Enhancement
- ENHNCS: Enhances
- ENTR: Entire
- ERN: Eastern
- ERY: Early
- ERYR: Earlier
- ESE: East southeast
- ESELY: East southeasterly
- ESERN: East southeastern
- ESEWD: East southeastward
- ESNTL: Essential
- EST: Estimate
- ESTAB: Establish
- ETA: Estimated time of arrival or ETA model
- ETC: Et cetera
- ETIM: Elapsed time
- EVE: Evening
- EWD: Eastward
- EXCLV: Exclusive
- EXCLVLY: Exclusively
- EXCP: Except
- EXPC: Expect
- EXPCD: Expected
- EXPCG: Expecting
- EXTD: Extend
- EXTDD: Extended
- EXTDG: Extending
- EXTDS: Extends
- EXTN: Extension
- EXTRAP: Extrapolate
- EXTRAPD: Extrapolated
- EXTRM: Extreme
- EXTRMLY: Extremely
- EXTSV: Extensive
- F: Fahrenheit
- FA: Aviation area forecast
- FAM: Familiar
- FCST: Forecast
- FCSTD: Forecasted
- FCSTG: Forecasting
- FCSTR: Forecaster
- FCSTS: Forecasts
- FIG: Figure
- FILG: Filling
- FIR: Flight information region
- FIRAV: First available
- FL: Florida or flight level
- FLG: Falling
- FLRY: Flurry
- FLRYS: Flurries
- FLT: Flight
- FLW: Follow
- FLWG: Following
- FM: From
- FMT: Format
- FNCTN: Function
- FNT: Front
- FNTGNS: Frontogenesis
- FNTL: Frontal
- FNTLYS: Frontolysis
- FNTS: Fronts
- FORNN: Forenoon
- FPM: Feet per minute
- FQT: Frequent
- FQTLY: Frequently
- FRM: Form
- FRMG: Forming
- FRMN: Formation
- FROPA: Frontal passage
- FROSFC: Frontal surface
- FRST: Frost
- FRWF: Forecast wind factor
- FRZ: Freeze
- FRZG: Freezing
- FRZLVL: Freezing level
- FRZN: Frozen
- FT: Feet
- FTHR: Further
- FVRBL: Favorable
- FWD: Forward
- FYI: For your information
- G: Gust
- GA: Georgia
- GEN: General
- GENLY: Generally
- GEO: Geographic
- GEOREF: Geographical reference
- GF: Fog
- GICG: Glaze icing
- GLFALSK: Gulf of Alaska
- GLFCAL: Gulf of California
- GLFMEX: Gulf of Mexico
- GLFSTLAWR: Gulf of St. Lawrence
- GND: Ground
- GRAD: Gradient
- GRDL: Gradual
- GRDLY: Gradually
- GRT: Great
- GRTLKS: Great Lakes
- GRTLY: Greatly
- GSTS: Gusts
- GSTY: Gusty
- GTS: Global Telecommunication System
- HAZ: Hazard
- HDFRZ: Hard freeze
- HDSVLY: Hudson Valley
- HDWND: Head wind
- HGT: Height
- HI: Hawaii
- HI: High
- HIER: Higher
- HIFOR: High level forecast
- HLF: Half
- HLSTO: Hailstones
- HLTP: Hilltop
- HND: Hundred
- HPC: Hydrometeorological Prediction Center
- HR: Hour
- HRS: Hours
- HRZN: Horizon
- HTG: Heating
- HURCN: Hurricane
- HUREP: Hurricane report
- HV: Have
- HVY: Heavy
- HVYR: Heavier
- HVYST: Heaviest
- HWVR: However
- HWY: Highway
- IA: Iowa
- IC: Ice (in PIREPs only)
- ICAO: International Civil Aviation Organization
- ICG: Icing
- ICGIC: Icing in clouds
- ICGICIP: Icing in clouds and in precipitation
- ICGIP: Icing in precipitation
- ID: Idaho
- IFR: Instrument flight rules
- IL: Illinois
- IMDT: Immediate
- IMDTLY: Immediately
- IMPL: Impulse
- IMPLS: Impulses
- IMPT: Important
- INCL: Include
- INCLD: Included
- INCLG: Including
- INCLS: Includes
- INCR: Increase
- INCRD: Increased
- INCRG: Increasing
- INCRGLY: Increasingly
- INCRS: Increases
- INDC: Indicate
- INDCD: Indicated
- INDCG: Indicating
- INDCS: Indicates
- INDEF: Indefinite
- INFO: Information
- INLD: Inland
- INSTBY: Instability
- INTCNTL: Intercontinental
- INTL: International
- INTMD: Intermediate
- INTMT: Intermittent
- INTMTLY: Intermittently
- INTR: Interior
- INTRMTRGN: Intermountain region
- INTS: Intense
- INTSFCN: Intensification
- INTSFY: Intensify
- INTSFYD: Intensified
- INTSFYG: Intensifying
- INTSFYS: Intensifies
- INTSTY: Intensity
- INTVL: Interval
- INVOF: In vicinity of
- INVRN: Inversion
- IOVC: In overcast
- IP: Ice pellets
- IPV: Improve
- IPVG: Improving
- ISOL: Isolate
- ISOLD: Isolated
- JCTN: Junction
- JTSTR: Jet stream
- KFRST: Killing frost
- KLYR: Smoke layer aloft
- KOCTY: Smoke over city
- KS: Kansas
- KT: Knots
- KY: Kentucky
- LA: Louisiana
- LABRDR: Labrador
- LAT: Latitude
- LAWRS: Limited aviation weather reporting station
- LCL: Local
- LCLY: Locally
- LCTD: Located
- LCTMP: Little change in temperature
- LCTN: Location
- LEVEL: Level
- LFTG: Lifting
- LGRNG: Long range
- LGT: Light
- LGTR: Lighter
- LGWV: Long wave
- LI: Lifted Index
- LIS: Lifted Indices
- LK: Lake
- LKLY: Likely
- LKS: Lakes
- LLJ: Low level jet
- LLWAS: Low level wind shear alert system
- LLWS: Low level wind shear
- LMTD: Limited
- LMTG: Limiting
- LMTS: Limits
- LN: Line
- LO: Low
- LONG: Longitude
- LONGL: Longitudinal
- LRG: Large
- LRGR: Larger
- LRGST: Largest
- LST: Local standard time
- LTD: Limited
- LTG: Lightning
- LTGCC: Lightning cloud to cloud
- LTGCCCG: Lightning cloud to cloud cloud to ground
- LTGCG: Lightning cloud to ground
- LTGCW: Lightning cloud to water
- LTGIC: Lightning in cloud
- LTL: Little
- LTLCG: Little change
- LTR: Later
- LTST: Latest
- LV: Leaving
- LVL: Level
- LVLS: Levels
- LWR: Lower
- LWRD: Lowered
- LWRG: Lowering
- LYR: Layer
- LYRD: Layered
- LYRS: Layers
- MA: Massachusetts
- MAN: Manitoba
- MAX: Maximum
- MB: Millibars
- MCD: Mesoscale discussion
- MD: Maryland
- MDFY: Modify
- MDFYD: Modified
- MDFYG: Modifying
- MDL: Model
- MDLS: Models
- MDT: Moderate
- MDTLY: Moderately
- ME: Maine
- MED: Medium
- MEGG: Merging
- MESO: Mesoscale
- MET: Meteorological
- METAR: Aviation routine weather report
- METRO: Metropolitan
- MEX: Mexico
- MHKVLY: Mohawk Valley
- MI: Michigan
- MID: Middle
- MIDN: Midnight
- MIL: Military
- MIN: Minimum
- MISG: Missing
- MLTLVL: Melting level
- MN: Minnesota
- MNLD: Mainland
- MNLY: Mainly
- MO: Missouri
- MOGR: Moderate or greater
- MOV: Move
- MOVD: Moved
- MOVG: Moving
- MOVMT: Movement
- MOVS: Moves
- MPH: Miles per hour
- MRGL: Marginal
- MRGLLY: Marginally
- MRNG: Morning
- MRTM: Maritime
- MS: Mississippi
- MSG: Message
- MSL: Mean sea level
- MST: Most
- MSTLY: Mostly
- MSTR: Moisture
- MT: Montana
- MTN: Mountain
- MTNS: Mountains
- MULT: Multiple
- MULTILVL: Multilevel
- MWO: Meteorological Watch Office
- MXD: Mixed
- N: North
- NAB: Not above
- NAT: North Atlantic
- NATL: National
- NAV: Navigation
- NB: New Brunswick
- NBND: Northbound
- NBRHD: Neighborhood
- NC: North Carolina
- NCEP: National Center of Environmental
- NCO: NCEP Central Operations
- NCWX: No change in weather
- ND: North Dakota
- NE: Northeast
- NEB: Nebraska
- NEC: Necessary
- NEG: Negative
- NEGLY: Negatively
- NELY: Northeasterly
- NERN: Northeastern
- NEW ENG: New England
- NEWD: Northeastward
- NFLD: Newfoundland
- NGM: Nested grid model
- NGT: Night
- NH: New Hampshire
- NIL: None
- NJ: New Jersey
- NL: No layers
- NLT: Not later than
- NLY: Northerly
- NM: New Mexico
- NMBR: Number
- NMBRS: Numbers
- NML: Normal
- NMRS: Numerous
- NNE: North northeast
- NNELY: North northeasterly
- NNERN: North northeastern
- NNEWD: North northeastward
- NNNN: End of message
- NNW: North northwest
- NNWLY: North northwesterly
- NNWRN: North northwestern
- NNWWD: North northwestward
- NOAA: National Oceanic and Atmospheric Administration
- NOPAC: Northern Pacific
- NPRS: Nonpersistent
- NR: Near
- NRLY: Nearly
- NRN: Northern
- NRW: Narrow
- NS: Nova Scotia
- NTFY: Notify
- NTFYD: Notified
- NV: Nevada
- NVA: Negative vorticity advection
- NW: Northwest
- NWD: Northward
- NWLY: Northwesterly
- NWRN: Northwestern
- NWS: National Weather Service
- NXT: Next
- NY: New York
- OAT: Outside air temperature
- OBND: Outbound
- OBS: Observation
- OBSC: Obscure
- OBSCD: Obscured
- OBSCG: Obscuring
- OCFNT: Occluded front observed
- OCLD: Occlude
- OCLDD: Occluded
- OCLDG: Occluding
- OCLDS: Occludes
- OCLN: Occlusion
- OCNL: Occasional
- OCNLY: Occasionally
- OCR: Occur
- OCRD: Occurred
- OCRG: Occurring
- OCRS: Occurs
- OFC: Office
- OFP: Occluded frontal passage
- OFSHR: Offshore
- OH: Ohio
- OK: Oklahoma
- OMTNS: Over mountains
- ONSHR: On shore
- OR: Oregon
- ORGPHC: Orographic
- ORIG: Original
- OSV: Ocean station vessel
- OTLK: Outlook
- OTP: On top
- OTR: Other
- OTRW: Otherwise
- OUTFLO: Outflow
- OVC: Overcast
- OVHD: Overhead
- OVNGT: Overnight
- OVR: Over
- OVRN: Overrun
- OVRNG: Overrunning
- OVTK: Overtake
- OVTKG: Overtaking
- OVTKS: Overtakes
- PA: Pennsylvania
- PAC: Pacific
- PATWAS: Pilot’s automatic telephone weather answering service
- PBL: Planetary boundary layer
- PCPN: Precipitation
- PD: Period
- PDMT: Predominant
- PEN: Peninsula
- PERM: Permanent
- PGTSND: Puget Sound
- PHYS: Physical
- PIBAL: Pilot balloon observation
- PIREP: Pilot weather report
- PL: Ice pellets
- PLNS: Plains
- PLS: Please
- PLTO: Plateau
- PM: Postmeridian
- PNHDL: Panhandle
- POS: Positive
- POSLY: Positively
- PPINA: Radar weather report not available
- PPINE: Radar weather report no echoes
- PPSN: Present position
- PRBL: Probable
- PRBLTY: Probability
- PRBLY: Probably
- PRECD: Precede
- PRECDD: Preceded
- PRECDG: Preceding
- PRECDS: Precedes
- PRES: Pressure
- PRESFR: Pressure falling rapidly
- PRESRR: Pressure rising rapidly
- PRIM: Primary
- PRIN: Principal
- PRIND: Present indications are
- PRJMP: Pressure jump
- PROB: Probability
- PROC: Procedure
- PROD: Produce
- PRODG: Producing
- PROG: Forecast
- PROGD: Forecasted
- PROGS: Forecasts
- PRSNT: Present
- PRSNTLY: Presently
- PRST: Persist
- PRSTNC: Persistence
- PRSTNT: Persistent
- PRSTS: Persists
- PRVD: Provide
- PRVDD: Provided
- PRVDG: Providing
- PRVDS: Provides
- PS: Plus
- PSBL: Possible
- PSBLTY: Possibility
- PSBLY: Possibly
- PSG: Passage
- PSN: Position
- PSND: Positioned
- PTCHY: Patchy
- PTLY: Partly
- PTNL: Potential
- PTNLY: Potentially
- PTNS: Portions
- PUGET: Puget Sound
- PVA: Positive vorticity advection
- PVL: Prevail
- PVLD: Prevailed
- PVLG: Prevailing
- PVLS: Prevails
- PVLT: Prevalent
- PWB: Pilot weather briefing
- PWR: Power
- QN: Question
- QSTNRY: Quasistationary
- QTR: Quarter
- QUAD: Quadrant
- QUE: Quebec
- R: Rain
- RADAT: Radiosonde additional data
- RAOB: Radiosonde observation
- RCH: Reach
- RCHD: Reached
- RCHG: Reaching
- RCHS: Reaches
- RCKY: Rocky
- RCKYS: Rockies
- RCMD: Recommend
- RCMDD: Recommended
- RCMDG: Recommending
- RCMDS: Recommends
- RCRD: Record
- RCRDS: Records
- RCV: Receive
- RCVD: Received
- RCVG: Receiving
- RCVS: Receives
- RDC: Reduce
- RDGG: Ridging
- RDVLP: Redevelop
- RDVLPG: Redeveloping
- RDVLPMT: Redevelopment
- RE: Regard
- RECON: Reconnaissance
- REF: Reference
- REPL: Replace
- REPLD: Replaced
- REPLG: Replacing
- REPLS: Replaces
- REQ: Request
- REQS: Requests
- REQSTD: Requested
- RES: Reserve
- RESP: Response
- RESTR: Restrict
- RGD: Ragged
- RGL: Regional model
- RGLR: Regular
- RGLY: Largely
- RGN: Region
- RGNS: Regions
- RGT: Right
- RH: Relative humidity
- RI: Rhode Island
- RIOGD: Rio Grande
- RLBL: Reliable
- RLTV: Relative
- RMK: Remark
- RMN: Remain
- RMND: Remained
- RMNDR: Remainder
- RMNG: Remaining
- RMNS: Remains
- RNFL: Rainfall
- ROT: Rotate
- ROTD: Rotated
- ROTG: Rotating
- ROTS: Rotates
- RPD: Rapid
- RPDLY: Rapidly
- RPLC: Replace
- RPLCD: Replaced
- RPLCG: Replacing
- RPLCS: Replaces
- RPRT: Report
- RPRTD: Reported
- RPRTG: Reporting
- RPRTS: Reports
- RPT: Repeat
- RPTG: Repeating
- RPTS: Repeats
- RQR: Require
- RQRD: Required
- RQRG: Requiring
- RQRS: Requires
- RSG: Rising
- RSN: Reason
- RSNG: Reasoning
- RSNS: Reasons
- RSTR: Restrict
- RSTRD: Restricted
- RSTRG: Restricting
- RSTRS: Restricts
- RTRN: Return
- RTRND: Returned
- RTRNG: Returning
- RTRNS: Returns
- RUF: Rough
- RUFLY: Roughly
- RVS: Revise
- RVSD: Revised
- RVSG: Revising
- RVSS: Revises
- RWY: Runway
- S: South
- S RLTVLY: Relatively
- SAB: Satellite Analysis Branch
- SASK: Saskatchewan
- SATFY: Satisfactory
- SBND: Southbound
- SBSD: Subside
- SBSDD: Subsided
- SBSDNC: Subsidence
- SBSDS: Subsides
- SC: South Carolina or stratocumulus
- SCND: Second
- SCNDRY: Secondary
- SCSL: Stratocumulus standing lenticular
- SCT: Scatter
- SCTD: Scattered
- SCTR: Sector
- SD: South Dakota
- SE: Southeast
- SEC: Second
- SELY: Southeasterly
- SEPN: Separation
- SEQ: Sequence
- SERN: Southeastern
- SEV: Severe
- SEWD: Southeastward
- SFC: Surface
- SG: Snow grains
- SGFNT: Significant
- SGFNTLY: Significantly
- SHFT: Shift
- SHFTD: Shifted
- SHFTG: Shifting
- SHFTS: Shifts
- SHLD: Shield
- SHLW: Shallow
- SHRT: Short
- SHRTLY: Shortly
- SHRTWV: Shortwave
- SHUD: Should
- SHWR: Shower
- SIERNEV: Sierra Nevada
- SIG: Signature
- SIGMET: Significant meteorological information
- SIMUL: Simultaneous
- SKC: Sky clear
- SKED: Schedule
- SLD: Solid
- SLGT: Slight
- SLGTLY: Slightly
- SLO: Slow
- SLOLY: Slowly
- SLOR: Slower
- SLP: Slope
- SLPG: Sloping
- SLW: Slow
- SLY: Southerly
- SM: Statute mile
- SML: Small
- SMLR: Smaller
- SMRY: Summary
- SMTH: Smooth
- SMTHR: Smoother
- SMTHST: Smoothest
- SMTM: Sometime
- SMWHT: Somewhat
- SN: Snow
- SNBNK: Snowbank
- SNFLK: Snowflake
- SNGL: Single
- SNOINCR: Snow increase
- SNOINCRG: Snow increasing
- SNST: Sunset
- SOP: Standard operating procedure
- SPC: Storm Prediction Center
- SPCLY: Especially
- SPD: Speed
- SPKL: Sprinkle
- SPLNS: Southern Plains
- SPRD: Spread
- SPRDG: Spreading
- SPRDS: Spreads
- SPRL: Spiral
- SQ: Squall
- SQLN: Squall line
- SR: Sunrise
- SRN: Southern
- SRND: Surround
- SRNDD: Surrounded
- SRNDG: Surrounding
- SRNDS: Surrounds
- SS: Sunset
- SSE: South southeast
- SSELY: South southeasterly
- SSERN: South southeastern
- SSEWD: South southeastward
- SSW: South southwest
- SSWLY: South southwesterly
- SSWRN: South southwestern
- SSWWD: South southwestward
- ST: Stratus
- STAGN: Stagnation
- STBL: Stable
- STBLTY: Stability
- STD: Standard
- STDY: Steady
- STFR: Stratus fractus
- STFRM: Stratiform
- STG: Strong
- STGLY: Strongly
- STGR: Stronger
- STGST: Strongest
- STM: Storm
- STMS: Storms
- STN: Station
- STNRY: Stationary
- SUB: Substitute
- SUBTRPCL: Subtropical
- SUF: Sufficient
- SUFLY: Sufficiently
- SUG: Suggest
- SUGG: Suggesting
- SUGS: Suggests
- SUP: Supply
- SUPG: Supplying
- SUPR: Superior
- SUPSD: Supersede
- SUPSDG: Superseding
- SUPSDS: Supersedes
- SVG: Serving
- SVRL: Several
- SW: Southwest
- SWD: Southward
- SWLY: Southwesterly
- SWRN: Southwestern
- SWWD: Southwestward
- SX: Stability index
- SXN: Section
- SYNOP: Synoptic
- SYNS: Synopsis
- SYS: System
- TAF: Aviation terminal forecast
- TCNTL: Transcontinental
- TCU: Towering cumulus
- TDA: Today
- TEMP: Temperature
- THK: Thick
- THKNG: Thickening
- THKNS: Thickness
- THKR: Thicker
- THKST: Thickest
- THN: Thin
- THNG: Thinning
- THNR: Thinner
- THNST: Thinnest
- THR: Threshold
- THRFTR: Thereafter
- THRU: Through
- THRUT: Throughout
- THSD: Thousand
- THTN: Threaten
- THTND: Threatened
- THTNG: Threatening
- THTNS: Threatens
- TIL: Until
- TMPRY: Temporary
- TMPRYLY: Temporarily
- TMW: Tomorrow
- TN: Tennessee
- TNDCY: Tendency
- TNDCYS: Tendencies
- TNGT: Tonight
- TNTV: Tentative
- TNTVLY: Tentatively
- TOPS: Tops
- TOVC: Top of overcast
- TPG: Topping
- TRBL: Trouble
- TRIB: Tributary
- TRKG: Tracking
- TRML: Terminal
- TRMT: Terminate
- TRMTD: Terminated
- TRMTG: Terminating
- TRMTS: Terminates
- TRNSP: Transport
- TRNSPG: Transporting
- TROF: Trough
- TROFS: Troughs
- TROP: Tropopause
- TRPCD: Tropical continental air mass
- TRPCL: Tropical
- TRRN: Terrain
- TRSN: Transition
- TS: Thunderstorm
- TSFR: Transfer
- TSFRD: Transferred
- TSFRG: Transferring
- TSFRS: Transfers
- TSNT: Transient
- TURBC: Turbulence
- TURBT: Turbulent
- TWD: Toward
- TWDS: Towards
- TWI: Twilight
- TWRG: Towering
- TX: Texas
- UA: Pilot weather reports
- UDDF: Up and downdrafts
- UN: Unable
- UNAVBL: Unavailable
- UNEC: Unnecessary
- UNKN: Unknown
- UNL: Unlimited
- UNRELBL: Unreliable
- UNRSTD: Unrestricted
- UNSATFY: Unsatisfactory
- UNSBL: Unseasonable
- UNSTBL: Unstable
- UNSTDY: Unsteady
- UNSTL: Unsettle
- UNSTLD: Unsettled
- UNUSBL: Unusable
- UPDFTS: Updrafts
- UPR: Upper
- UPSLP: Upslope
- UPSTRM: Upstream
- URG: Urgent
- USBL: Usable
- UT: Utah
- UTC: Universal Time Coordinate
- UVV: Upward vertical velocity
- UWNDS: Upper winds
- VA: Virginia
- VAAC: Volcanic Ash Advisory Center
- VAAS: Volcanic Ash Advisory Statement
- VAL: Valley
- VARN: Variation
- VCNTY: Vicinity
- VCOT: VFR conditions on top
- VCTR: Vector
- VFR: Visual flight rules
- VFY: Verify
- VFYD: Verified
- VFYG: Verifying
- VFYS: Verifies
- VLCTY: Velocity
- VLCTYS: Velocities
- VLNT: Violent
- VLNTLY: Violently
- VMC: Visual meteorological conditions
- VOL: Volume
- VORT: Vorticity
- VR: Veer
- VRBL: Variable
- VRG: Veering
- VRISL: Vancouver Island, BC
- VRS: Veers
- VRT MOTN: Vertical motion
- VRY: Very
- VSB: Visible
- VSBY: Visibility
- VSBYDR: Visibility decreasing rapidly
- VSBYIR: Visibility increasing rapidly
- VT: Vermont
- VV: Vertical velocity
- W: West
- WA: Washington
- WAA: Warm air advection
- WAFS: Word Area Forecast System
- WBND: Westbound
- WDLY: Widely
- WDSPRD: Widespread
- WEA: Weather
- WFO: Weather Forecast Office
- WFP: Warm front passage
- WFSO: Weather Forecast Service Office
- WI: Wisconsin
- WIBIS: Will be issued
- WINT: Winter
- WK: Weak
- WKDAY: Weekday
- WKEND: Weekend
- WKN: Weaken
- WKNG: Weakening
- WKNS: Weakens
- WKR: Weaker
- WKST: Weakest
- WL: Will
- WLY: Westerly
- WND: Wind
- WNDS: Winds
- WNW: West northwest
- WNWLY: West northwesterly
- WNWRN: West northwestern
- WNWWD: West northwestward
- WO: Without
- WPLTO: Western Plateau
- WRM: Warm
- WRMFNT: Warm front
- WRMFNTL: Warm frontal
- WRMG: Warming
- WRMR: Warmer
- WRMST: Warmest
- WRN: Western
- WRNG: Warning
- WRS: Worse
- WS: Wind shear
- WSFO: Weather Service Forecast Office
- WSHFT: Windshift
- WSTCH: Wasatch Range
- WSW: West southwest
- WSWLY: West southwesterly
- WSWRN: West southwestern
- WSWWD: West southwestward
- WTR: Water
- WTSPT: Waterspout
- WUD: Would
- WV: West Virginia
- WVS: Waves
- WW: Severe weather watch
- WWD: Westward
- WX: Weather
- WY: Wyoming
- XCP: Except
- XPC: Expect
- XPCD: Expected
- XPCG: Expecting
- XPCS: Expects
- XPLOS: Explosive
- XTND: Extend
- XTNDD: Extended
- XTNDG: Extending
- XTRM: Extreme
- XTRMLY: Extremely
- YDA: Yesterday
- YKN: Yukon
- YLSTN: Yellowstone
- ZN: Zone
- ZNS: Zones