Contractions

Contraction

Decode

A

ABN

Airport Beacon

ABV

Above

ACFT

Aircraft

ACT

Active

AD

Aerodrome

ADJ

Adjacent

AGL

Above Ground Level

ALS

Approach Light System

ALT

Altitude

ALTN

Alternate

AP

Airport

APCH

Approach

APP

Approach Control

ARR

Arrive, Arrival

ASPH

Asphalt

ATC

Air Traffic Control

ATIS

Automatic Terminal Information Service

AUTH

Authority

AVBL

Available

AWY

Airway

AZM

Azimuth

B

BA GOOD

Braking action good

BA GOOD TO MEDIUM

Braking action good to medium

BA MEDIUM

Braking action medium

BA MEDIUM TO POOR

Braking action medium to poor

BC

Back Course

BCN

Beacon

BLW

Below

C

CAT

Category

CK

Check

CL

Center line

CLSD

Closed

CMB

Climb

COM

Communications

CONC

Concrete

CTC

Contact

CTL

Control

D

DCT

Direct

DEG

Degrees

DH

Decision Height

DIST

Distance

DLA

Delay or Delayed

DLY

Daily

DME

Distance Measuring Equipment

DP

Dew Point Temperature

E

E

East

ELEV

Elevation

ENG

Engine

EXC

Except

F

FAF

Final Approach fix

FAN MKR

Fan Marker

FDC

Flight Data Center

FM

From

FREQ

Frequency

FNA

Final Approach

FRI

Friday

FSS

Automated/Flight Service Station

FT

Foot, feet

G

GCA

Ground Control Approach

GP

Glide Path

GPS

Global Positioning System

GRVL

Gravel

H

HDG

Heading

HEL

Helicopter

HELI

Heliport

HIRL

High Intensity Runway Lights

HIWAS

Hazardous Inflight Weather Advisory Service

HLDG

Holding

HR

Hour

I

IAF

Initial approach fix

IAP

Instrument Approach Procedure

INBD

Inbound

ID

Identification

IDENT

Identify/Identifier/Identification

IF

Intermediate approach fix

ILS

Instrument Landing System

IM

Inner Marker

IN

Inch/Inches

INFO

Information

INOP

Inoperative

INSTR

Instrument

INT

Intersection

INTL

International

INTST

Intensity

K

KT

Knots

L

L

Left

LAA

Local Airport Advisory

LAT

Latitude

LAWRS

Limited Aviation Weather Reporting Station

LB

Pound/Pounds

LC

Local Control

LOC

Localizer

LGT

Light or Lighting

LGTD

Lighted

LIRL

Low Intensity Runway Lights

LM

Locator Middle

LDG

Landing

LO

Outer Locator

LONG

Longitude

M

MAINT

Maintain, maintenance

MALS

Medium Intensity Approach Light System

MALSF

Medium Intensity Approach Light System with Sequenced Flashers

MALSR

Medium Intensity Approach Light System with Runway Alignment Indicator Lights

MAPT

Missed Approach Point

MCA

Minimum Crossing Altitude

MDA

Minimum Descent Altitude

MEA

Minimum En Route Altitude

MIN

Minute

MIRL

Medium Intensity Runway Lights

MLS

Microwave Landing System

MM

Middle Marker

MNM

Minimum

MNT

Monitor/Monitoring/Monitored

MOC

Minimum Obstruction Clearance

MON

Monday

MSG

Message

MSL

Mean Sea Level

N

N

North

NA

Not Authorized

NAV

Navigation

NB

Northbound

NDB

Nondirectional Radio Beacon

NE

North-east

NGT

Night

NM

Nautical Mile(s)

NTAP

Notice To Airmen Publication

NW

North-west

O

OBSC

Obscured

OBST

Obstacle

OM

Outer Marker

OPR

Operate

OPS

Operation

P

PAPI

Precision Approach Path Indicator

PAR

Precision Approach Radar

PARL

Parallel

PAX

Passenger

PCL

Pilot Controlled Lighting

PERM

Permanent/Permanently

PJE

Parachute Jumping Exercise

PLA

Practice Low Approach

PN

Prior Notice Required

PPR

Prior Permission Required

PRN

Psuedo random noise

PROC

Procedure

PTN

Procedure Turn

R

RAIL

Runway Alignment Indicator Lights

RCL

Runway Centerline

RCLL

Runway Centerline Light System

REC

Receive/Receiver

REIL

Runway End Identifier Lights

REP

Report

RLLS

Runway Lead-in Lights System

RNAV

Area Navigation

RPLC

Replace

RSR

En route Surveillance Radar

RTS

Return to Service

RVR

Runway Visual Range

RWY

Runway

S

S

South

SAT

Saturday

SB

Southbound

SE

Southeast

SID

Standard Instrument Departure

SIMUL

Simultaneous

SKED

Scheduled

SSALF

Simplified Short Approach Lighting System with Sequenced Flashers

SSALR

Simplified Short Approach Lighting System with Runway Alignment Indicator Lights

SSALS

Simplified Short Approach Lighting System

SSR

Secondary Surveillance Radar

STA

Straight-in Approach

STAR

Standard Terminal Arrival

SUN

Sunday

SW

Southwest

T

T

Temperature

TACAN

Tactical Air Navigational Aid

TAR

Terminal Area Surveillance Radar

TDZ

Touchdown Zone

TEMPO

Temporary

TFC

Traffic

TFR

Temporary Flight Restriction

TGL

Touch and Go Landings

THR

Threshold

THRU

Through

THU

Thursday

TKOF

Takeoff

TUE

Tuesday

TWR

Tower

TWY

Taxiway

U

UNREL

Unreliable

V

VASI

Visual Approach Slope Indicator

VIS

Visibility

VOR

VHF Omni-Directional Radio Range

VORTAC

VOR and TACAN (colocated)

W

W

West

WB

Westbound

WED

Wednesday

WI

Within

WPT

Waypoint

WX

Weather

Contraction

Decode

A

A

Absolute (Temperature)

A

Alaskan Standard Time (Time Groups Only)

A

Arctic (Air Mass)

A01

Automated Observation Without Precipitation Discriminator (Rain/Snow) (METAR)

A02

Automated Observation With Precipitation Discriminator (Rain/Snow) (METAR)

AAWF

Auxiliary Aviation Weather Facility

AC

Altocumulus

ACC

Altocumulus Castellanus

ACSL

Standing Lenticular Altocumulus

ACYC

Anticyclonic

ADRNDCK

Adirondack

ADV

Advise

ADVCTN

Advection

ADVY

Advisory

AFC

Area Forecast Center

AFDK

After Dark

ALF

Aloft

ALGHNY

Allegheny

ALQDS

All Quadrants

ALSEC

All Sectors

ALTA

Alberta

ALUTN

Aleutian

ALWF

Actual Wind Factor

AM

Ante Meridiem

AMD

Amended Forecast (TAF)

AMPLTD

Amplitude

AMS

Air Mass

AMS

American Meteorological Society

ANLYS

Analysis

APLCN

Appalachian

AS

Altostratus

ASOS

Automated Surface Observing System

ATLC

Atlantic

AURBO

Aurora Borealis

AWP

Aviation Weather Processors

B

B

Beginning of Precipitation (Time in Minutes) (Weather Reports Only)

B

Bering Standard Time (Time Groups Only)

BACLIN

Baroclinic or Baroclinic Prognosis

BATROP

Barotropic or Barotropic Prognosis

BC

Patches (METAR)

BC

British Columbia

BCFG

Patchy Fog (METAR)

BCH

Beach

BCKG

Backing

BDA

Bermuda

BECMG

Becoming (Expected Between 2 Digit Beginning Hour and 2 Digit Ending Hour) (TAF)

BFDK

Before Dark

BINOVC

Breaks in Overcast

BKN

Broken

BL

Between Layers

BL

Blowing (METAR)

BLD

Build

BLDUP

Buildup

BLKHLS

Black Hills

BLKT

Blanket

BLZD

Blizzard

BMS

Basic Meteorological Services

BNDRY

Boundary

BOVC

Base of Overcast

BR

Mist (METAR)

BRF

Brief

BRKHIC

Breaks in Higher Overcast

BRKSHR

Berkshire

BRM

Barometer

BTWN

Between

C

C

Central Standard Time (Time Groups Only)

C

Continental (Air Mass)

CAN

Canada

CARIB

Caribbean

CASCDS

Cascades

CAVOK

Cloud and Visibility OK (METAR)

CAVU

Clear or Scattered Clouds and Visibility Greater Than Ten Miles

CAWS

Common Aviation Weather Sub-system

CB

Cumulonimbus

CBMAM

Cumulonimbus Mamma

CC

Cirrocumulus

CCLKWS

Counterclockwise

CCSL

Standing Lenticular Cirrocumulus

CDFNT

Cold Front

CFP

Cold Front Passage

CHARC

Characteristic

CHSPK

Chesapeake

CI

Cirrus

CIG

Ceiling

CLD

Cloud

CLR

Clear at or below 12,000 feet (AWOS/ASOS report) (METAR)

CLRS

Clear and Smooth

CNCL

Cancel

CNDN

Canadian

CNVTV

Convective

CONFDC

Confidence

CONTDVD

Continental Divide

CONTRAILS

Condensation Trails

COR

Correction to the Observation (METAR)

CS

Cirrostratus

CST

Coast

CTGY

Category

CTSKLS

Catskills

CU

Cumulus

CUFRA

Cumulus Fractus

CYC

Cyclonic

CYCLGN

Cyclogenesis

D

DABRK

Daybreak

DCAVU

Clear or Scattered Clouds and Visibility Greater than Ten, Remainder of Report Missing (Weather Reports Only)

DKTS

Dakotas

DMSH

Diminish

DNS

Dense

DNSLP

Downslope

DNSTRM

Downstream

DP

Deep

DPNG

Deepening

DPTH

Depth

DR

Low Drifting (METAR)

DRFT

Drift

DS

Dust Storm (METAR)

DSIPT

Dissipate

DTLN

International Dateline

DTRT

Deteriorate

DU

Widespread Dust (METAR)

DVV

Downward Vertical Velocity

DWNDFTS

Downdrafts

DWPNT

Dew Point

DZ

Drizzle (METAR)

E

E

Eastern Standard Time (Time Groups Only)

E

Ending of Precipitation (Time in Minutes) (Weather Reports Only)

E

Equatorial (Air Mass)

E

Estimated (Weather Reports Only)

ELNGT

Elongate

EMBDD

Embedded

EMSU

Environment Meteorological Support Unit

ENERN

East-northeastern (weather reports only)

ENEWD

East-northeastward (weather reports only)

EOF

Expected Operations Forecast

ESERN

East-southeastern (weather reports only)

ESEWD

East-southeastward (weather reports only)

EXTRAP

Extrapolate

EXTRM

Extreme

F

FA

Area Forecast

FAH

Fahrenheit

FEW

1 or 2 Octas (eighths) Cloud Coverage (METAR)

FC

Funnel Cloud (METAR)

+FC

Tornado/ Water Spout (METAR)

FG

Fog (METAR)

FIBI

Filed but Impractical to Transmit

FILG

Filling

FINO

Weather Report Will Not Be Filed for Transmission

FL

Flash Advisory

FLDST

Flood Stage

FLG

Falling

FLRY

Flurry

FLWIS

Flood Warning Issued

FM

From (4 Digit Beginning Time in Hours and Minutes) (TAF)

FNT

Front

FNTGNS

Frontogenesis

FNTLYS

Frontolysis

FORNN

Forenoon

FRMG

Forming

FROPA

Frontal Passage

FROSFC

Frontal Surface

FRST

Frost

FRWF

Forecast Wind Factor

FRZ

Freeze

FRZLVL

Freezing Level

FRZN

Frozen

FT

Terminal Forecast

FU

Smoke (METAR)

FULYR

Smoke Layer Aloft

FUOCTY

Smoke Over City

FWC

Fleet Weather Central

FZ

Supercooled/Freezing (METAR)

G

G

Gusts Reaching (Knots) (Weather Reports Only)

GLFALSK

Gulf of Alaska

GLFCAL

Gulf of California

GLFMEX

Gulf of Mexico

GLFSTLAWR

Gulf of St. Lawrence

GR

Hail (METAR)

GRAD

Gradient

GRBNKS

Grand Banks

GRDL

Gradual

GRTLKS

Great Lakes

GS

Small Hail/Snow Pellets (METAR)

GSTS

Gusts

GSTY

Gusty

H

HCVIS

High Clouds Visible

HDFRZ

Hard Freeze

HDSVLY

Hudson Valley

HI

Hi

HIEAT

Highest Temperature Equaled for All Time

HIEFM

Highest Temperature Equaled for The Month

HIESE

Highest Temperature Equaled So Early

HIESL

Highest Temperature Equaled So Late

HIFOR

High Level Forecast

HITMP

Highest Temperature

HIXAT

Highest Temperature Exceeded for All Time

HIXFM

Highest Temperature Exceeded for The Month

HIXSE

Highest Temperature Exceeded So Early

HIXSL

Highest Temperature Exceeded So Late

HLSTO

Hailstones

HLTP

Hilltop

HLYR

Haze Layer Aloft

HURCN

Hurricane

HUREP

Hurricane Report

HX

High Index

HZ

Haze (METAR)

I

IC

Ice Crystals (METAR)

ICG

Icing

ICGIC

Icing in Clouds

ICGICIP

Icing in Clouds and Precipitation

ICGIP

Icing in Precipitation

IMDT

Immediate

INLD

Inland

INSTBY

Instability

INTR

Interior

INTRMTRGN

Inter-Mountain Region

INTS

Intense

INTSFY

Intensify

INVRN

Inversion

IOVC

In Overcast

IR

Ice on Runway

J

JTSTR

Jet Stream

K

K

Cold (air mass)

KFRST

Killing Frost

L

LABRDR

Labrador

LCTMP

Little Change in Temperature

LDG

Landing

LFT

Lift

LGRNG

Long Range

LIFR

Low IFR (Weather Reports Only)

LK

Lake

LOEAT

Lowest Temperature Equaled for All Time

LOEFM

Lowest Temperature Equaled for The Month

LOESE

Lowest Temperature Equaled So Early

LOESL

Lowest Temperature Equaled So Late

LOTMP

Lowest Temperature

LOXAT

Lowest Temperature Exceeded for All Time

LOXFM

Lowest Temperature Exceeded for The Month

LOXSE

Lowest Temperature Exceeded So Early

LOXSL

Lowest Temperature Exceeded So Late

LSR

Loose Snow on Runway

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 Clouds

LTLCG

Little Change

LTNG

Lightning

LX

Low Index

LYR

Layer or Layered or Layers

M

M

Maritime (Air Mass)

M

In Temperature Field Means "Minus" or Below Zero (METAR)

M

In RVR Field, Indicates Visibility Less than Lowest Reportable Sensor Value (e.g. M0600FT)

M

Missing (Weather Reports Only)

M

Mountain Standard Time (Time Groups Only)

MA

Map Analysis

MAN

Manitoba

MEGG

Merging

MEX

Mexico

MHKVLY

Mohawk Valley

MI

Shallow (METAR)

MIDN

Midnight

MIFG

Patches of Shallow Fog Not Deeper Than Two Meters (METAR)

MLTLVL

Melting Level

MMO

Main Meteorological Office

MNLD

Mainland

MOGR

Moderate or Greater

MONTR

Monitor

MOV

Move

MRGL

Marginal

MRNG

Morning

MRTM

Maritime

MS

Minus

MSTLY

Mostly

MSTR

Moisture

MTN

Mountain

MVFR

Marginal VFR

MXD

Mixed

N

NB

New Brunswick

NCWX

No Change in Weather

NELY

Northeasterly (weather reports only)

NERN

Northeastern

NEW ENG

New England

NFLD

Newfoundland

NGT

Night

NL

No Layers

NMBR

Number

NNERN

North-northeastern (weather reports only)

NNEWD

North-northeastward (weather reports only)

NNWRN

North-northwestern (weather reports only)

NNWWD

Northwestward (weather reports only)

NO

Not available (e.g. SLPNO, RVRNO)

NORPI

No Pilot Balloon Observation Will Be Filed Next Collection Unless Weather Changes Significantly

NPRS

Nonpersistent

NS

Nimbostratus

NS

Nova Scotia

NSCSWD

No Small Craft or Storm Warning Are Being Displayed

NSW

No Significant Weather (METAR)

NVA

Negative Vorticity Advection

NWLY

Northwesterly (Weather Reports Only)

NWRN

Northwestern (Weather Reports Only)

O

OBS

Observation

OBSC

Obscure

OCFNT

Occluded Front

OCLD

Occlude

OCLN

Occlusion

OFP

Occluded Frontal Passage

OFSHR

Offshore

OMTNS

Over Mountains

ONSHR

On Shore

ONT

Ontario

ORGPHC

Orographic

OSV

Ocean Station Vessel

OTAS

On Top and Smooth

OTLK

Outlook

OVC

Overcast

P

P

Pacific Standard Time (Time Group Only)

P

Polar (Air Mass)

P

In RVR Field, Indicates Visibility Greater Than Highest Reportable Sensor Value (e.g. P6000FT)

P6SM

Visibility Greater Than 6 Statute Miles (TAF Only)

PAC

Pacific

PBL

Probable

PCPN

Precipitation

PDMT

Predominant

PDMT

Predominate

PDW

Priority Delayed Weather

PL

Ice Pellets (METAR)

PEN

Peninsula

PGTSND

Puget Sound

PIBAL

Pilot Balloon Observation

PISE

No Pilot Balloon Observation Due To Unfavorable Sea Conditions

PISO

No Pilot Balloon Observation Due To Snow

PIWI

No Pilot Balloon Observation Due To High, or Gusty, Surface Wind

PLW

Plow (snow)

PNHDL

Panhandle

PO

Dust/Sand Whirls (METAR)

PPINA

Radar Weather Report Not Available (Or Omitted For A Reason Different Than Those Otherwise Stated)

PPINE

Radar Weather Report No Echoes Observed

PPINO

Radar Weather Report Equipment Inoperative Due To Breakdown

PPIOK

Radar Weather Report Equipment Operation Resumed

PPIOM

Radar Weather Report Equipment Inoperative Due To Maintenance

PR

Partial (METAR)

PRBLTY

Probability

PRESFR

Pressure Falling Rapidly

PRESRR

Pressure Rising Rapidly

PRJMP

Pressure Jump (Weather Reports Only)

PROB40

Probability 40 Percent (METAR)

PROG

Prognosis or Prognostic

PRSNT

Present

PS

Plus

PSG

Passage

PSG

Passing

PTCHY

Patchy

PTLY

Partly

PVA

Positive Vorticity Advection

PY

Spray (METAR)

Q

QSTNRY

Quasi-stationary

QUE

Quebec

R

R

Runway (Used in RVR Measurement)

RA

Rain (METAR)

RABA

No RAWIN Obs., No Balloons Available

RABAL

Radiosonde Balloon Wind Data

RABAR

Radiosonde Balloon Release

RACO

No RAWIN Obs., Communications Out

RADAT

Radiosonde Observation Data

RADNO

Report Missing Account Radio Failure

RAFI

Radiosonde Observation Not Filed

RAFRZ

Radiosonde Observation Freezing Levels

RAHE

No RAWIN Obs., No Gas Available

RAICG

Radiosonde Observation Icing at

RAOB

Radiosonde Observation

RAREP

Radar Weather Report

RAVU

Radiosonde Analysis and Verification Unit

RAWE

No RAWIN obs., Unfavorable Weather

RAWI

No RAWIN Obs., High and Gusty Winds

RAWIN

Upper Winds Obs. (By Radio Methods)

RCD

Radar Cloud Detection Report

RCDNA

Radar Cloud Detection Report Not Available

RCDNE

Radar Cloud Detection Report No Echoes Observed

RCDNO

Radar Cloud Detector Inoperative Due to Breakdown Until

RCDOM

Radar Cloud Detector Inoperative Due to Maintenance Until

RCKY

Rockies (Mountains)

RDG

Ridge

RDWND

Radar Dome Wind

RESTR

Restrict

RGD

Ragged

RH

Relative Humidity

RHINO

Radar Echo Height Information Not Available

RHINO

Radar Range Height Indicator Not Operating on Scan

RIOGD

Rio Grande

RMK

Remark(s)

RNFL

Rainfall

ROBEPS

Radar Operating Below Prescribed Standard

RPD

Rapid

RSG

Rising

RUF

Rough

RY/RWY

Runway

S

SA

Sand (METAR)

SASK

Saskatchewan

SBSD

Subside

SC

Stratocumulus

SCSL

Standing Lenticular Stratocumulus

SCT

Scattered

SELS

Severe Local Storms

SELY

Southeasterly (Weather Reports Only)

SERN

Southeastern (Weather Reports Only)

SFERICS

Atmospherics

SG

Snow Grains (METAR)

SGD

Solar-Geophysical Data

SH

Showers (METAR)

SHFT

Shift (Weather Reports Only)

SHLW

Shallow

SHRTLY

Shortly

SHWR

Shower

SIERNEV

Sierra Nevada

SIR

Snow and Ice on Runway

SKC

Sky Clear (METAR)

SLD

Solid

SLP

Sea Level Pressure (e.g. 1013.2 Reported as 132)

SLR

Slush on Runway

SLT

Sleet

SM

Statute Mile(s)

SMK

Smoke

SMTH

Smooth

SN

Snow (METAR)

SNBNK

Snowbank

SNFLK

Snowflake

SNOINCR

Snow Depth Increase in Past Hour

SNW

Snow

SNWFL

Snowfall

SP

Station Pressure

SPECI

Special Report (METAR)

SPKL

Sprinkle

SPLNS

South Plains

SPRD

Spread

SQ

Squall (METAR)

SQAL

Squall

SQLN

Squall Line

SS

Sandstorm (METAR)

SSERN

South-southeastern (Weather Reports Only)

SSEWD

South-southeastward (Weather Reports Only)

SSWRN

South-southwestern (Weather Reports Only)

SSWWD

South-southwestward (Weather Reports Only)

ST

Stratus

STAGN

Stagnation

STFR

Stratus Fractus

STFRM

Stratiform

STG

Strong

STM

Storm

STNRY

Stationary

SWLG

Swelling

SWLY

Southwesterly (Weather Reports Only)

SWRN

Southwestern (Weather Reports Only)

SX

Stability Index

SXN

Section

SYNOP

Synoptic

SYNS

Synopsis

T

T

Trace (Weather Reports Only)

T

Tropical (Air Mass)

TCU

Towering Cumulus

TEMPO

Temporary Changes Expected (Between 2 Digit Beginning Hour and 2 Digit Ending Hour) (TAF)

THD

Thunderhead (non METAR)

THDR

Thunder (non METAR)

THK

Thick

THN

Thin

TKOF

Takeoff

TOP

Cloud Top

TOVC

Top of Overcast

TPG

Topping

TRIB

Tributary

TROF

Trough

TROP

Tropopause

TRPCD

Tropical Continental (Air Mass)

TRPCL

Tropical

TRPLYR

Trapping Layer

TS

Thunderstorm (METAR)

TSHWR

Thundershower (non METAR)

TSQLS

Thundersqualls (non METAR)

TSTM

Thunderstorm (non METAR)

TURBC

Turbulence

TURBT

Turbulent

TWRG

Towering

U

UAG

Upper Atmosphere Geophysics

UDDF

Up and Down Drafts

UNSBL

Unseasonable

UNSTBL

Unstable

UNSTDY

Unsteady

UNSTL

Unsettle

UP

Unknown Precipitation (Automated Observations)

UPDFTS

Updrafts

UPR

Upper

UPSLP

Upslope

UPSTRM

Upstream

UVV

Upward Vertical Velocity

UWNDS

Upper Winds

V

V

Varies (Wind Direction and RVR)

V

Variable (Weather Reports Only)

VA

Volcanic Ash (METAR)

VC

Vicinity

VLCTY

Velocity

VLNT

Violent

VLY

Valley

VR

Veer

VRB

Variable Wind Direction when Speed Is Less Than or Equal To 6 Knots

VRISL

Vancouver Island, BC

VRT MOTN

Vertical Motion

VSBY

Visibility

VSBYDR

Visibility Decreasing Rapidly

VSBYIR

Visibility Increasing Rapidly

VV

Vertical Visibility (Indefinite Ceiling) (METAR)

W

W

Warm (Air Mass)

WA

AIRMET

WDC-1

World Data Centers in Western Europe

WDC-2

World Data Centers Throughout Rest of World

WDLY

Widely

WDSPRD

Widespread

WEA

Weather

WFP

Warm Front Passage

WINT

Winter

WND

Wind

WNWRN

West-northwestern (Weather Reports Only)

WNWWD

West-northwestward (Weather Reports Only)

WPLTO

Western Plateau

WR

Wet Runway

WRM

Warm

WRMFNT

Warm Front

WRNG

Warning

WS

Wind Shear (in TAFs, Low Level and Not Associated with Convective Activity)

WS

SIGMET

WSHFT

Wind Shift

WSOM

Weather Service Operations Manual

WSR

Wet Snow on Runway

WSWRN

West-southwestern (Weather Reports Only)

WSWWD

West-southwestward (Weather Reports Only)

WTR

Water

WTSPT

Waterspout

WV

Wave

WW

Severe Weather Forecast

WXCON

Weather Reconnaissance Flight Pilot Report

X

XCP

Except

XPC

Expect

Y

Y

Yukon Standard Time (Time Groups Only)

YKN

Yukon

YLSTN

Yellowstone

Z

ZI

Zonal Index

ZI

Zone of Interior