|
Contraction
|
Definition
|
Usage
|
|
W
|
warm (air
mass)
|
NWS
|
|
W
|
west or
western
longitude
|
ICAO
|
|
W
|
White
|
ICAO
|
|
WA
|
AIRMET
|
NWS
|
|
WAAS
|
Wide Area
Augmentation
System
|
ATC
|
|
WAC
|
world
aeronautical
chart
|
GEN
|
|
WAC
|
World
aeronautical
chart ICAO
1:1 000
000(followed
by
name/title)
|
ICAO
|
|
WAFC
|
world area
forecast
center
|
ICAO
|
|
WAIOP
|
will accept,
if offered,
the position
|
GEN
|
|
WB
|
Westbound
|
ICAO
|
|
WBAR
|
wing bar
lights
|
ICAO
|
|
WBND
|
Westbound
|
ATC
|
|
WBRBN
|
will be
reported by
NOTAM
|
GEN
|
|
WBRH
|
Weather
Bureau
Regional
Headquarters
|
GEN
|
|
WBTS
|
Whereabouts
|
GEN
|
|
WCLC
|
Watch check
list
completed
|
GEN
|
|
WDC1
|
World Data
Centers in
Western
Europe
|
NWS
|
|
WDC2
|
World Data
Centers
throughout
rest of
world
|
NWS
|
|
WDI
|
wind
direction
indicator
|
ICAO
|
|
WDLY
|
Widely
|
NWS
|
|
WDSPR
|
Widespread
|
GEN
|
|
WDSPRD
|
Widespread
|
NWS
|
|
WEA
|
Weather
|
NWS
|
|
WEF
|
With effect
from, or
effective
from
|
ICAO
|
|
WFO |
Weather
Forecast
Office |
GEN |
|
WFP
|
Warm front
passage
|
NWS
|
|
WG
|
Working
group
|
GEN
|
|
WGS
|
World
Geodetic
System
|
ATC
|
|
WGS84
|
World
geodetic
system 1984
|
ICAO
|
|
WI
|
within
|
GEN
|
|
WIBIS
|
will be
issued
|
GEN
|
|
WICA
|
while in
control area
|
ATC
|
|
WICZ
|
while in
control zone
|
ATC
|
|
WID
|
width
|
ICAO
|
|
WIE
|
with
immediate
effect or
effective
immediately
|
ICAO
|
|
WILCO
|
will comply
|
GEN
|
|
WINT
|
winter
|
NWS
|
|
WINTEM
|
forecast
upper wind
and
temperature
for aviation
|
ICAO
|
|
WIP
|
work in
progress
|
GEN
|
|
WK
|
weak
|
GEN
|
|
WKDAY
|
weekday
|
GEN
|
|
WKEND
|
weekend
|
GEN
|
|
WKN
|
weaken
|
GEN
|
|
WL
|
will
|
GEN
|
|
WLAV
|
will advise
|
GEN
|
|
WMO
|
World
Meteorological
Organization
|
GEN
|
|
WMSC
|
Weather
Message
Switching
Center
|
GEN
|
|
WND
|
wind
|
NWS
|
|
WNW
|
westnorth
west
|
ICAO
|
|
WNWRN
|
westnorthwestern
(weather
reports
only)
|
NWS
|
|
WNWWD
|
westnorthwestward
(weather
reports
only)
|
NWS
|
|
WO
|
Washington
Office
|
GEN
|
|
WO
|
without
|
GEN
|
|
WP
|
waypoint
|
GEN
|
|
WPLTO
|
western
plateau
|
NWS
|
|
WPM
|
words per
minute
|
GEN
|
|
WPRT
|
waypoint
report
|
ATC
|
|
WPT
|
waypoint
|
ICAO
|
|
WR
|
wet runway
|
NWS
|
|
WRC
|
well to
right of
course
|
ATC
|
|
WRM
|
warm
|
NWS
|
|
WRMFNT
|
warm front
|
NWS
|
|
WRNG
|
warning
|
NWS
|
|
WRS
|
worse
|
GEN
|
|
WS
|
SIGMET
|
NWS
|
|
WS
|
weak signals
|
ATC
|
|
WS
|
wind shear
|
ICAO
|
|
WSCMO
|
Weather
Service
Contract
Meteorological
Observatory
|
GEN
|
|
WSHFT
|
wind shift
|
NWS
|
|
WSO
|
Weather
Service
Office
|
GEN
|
|
WSOM
|
weather
service
operations
manual
|
NWS
|
|
WSP
|
weather
system
processor
(replacement
for LLWAS)
|
GEN
|
|
WSR
|
wet snow on
runway
|
NWS
|
|
WSSF
|
National
Weather
Service
Support
Facility
|
GEN
|
|
WSSU
|
National
Weather
Service
Support Unit
|
GEN
|
|
WSTCH
|
wasatch
range
|
NWS
|
|
WSW
|
westsouth
west
|
ICAO
|
|
WSWRN
|
westsouthwestern
(weather
reports
only)
|
NWS
|
|
WSWWD
|
westsouthwestward
(weather
reports
only)
|
NWS
|
|
WT
|
Weight
|
GEN
|
|
WTR
|
Water
|
NWS
|
|
WTR
|
well to
right
|
ATC
|
|
WTSPT
|
waterspout
|
NWS
|
|
WU
|
Western
Union
Telegraph
Company
|
GEN
|
|
WV
|
Wave
|
NWS
|
|
WV
|
wind at
altitude (PIREP
only)
|
ATC
|
|
WW
|
severe
weather
forecast
|
NWS
|
|
WWW
|
World wide
web
|
ICAO
|
|
WX
|
Weather
|
ICAO
|
|
WX
|
weather at
altitude (PIREP
only)
|
ATC
|
|
WXCON
|
weather
reconnaissance
flight pilot
report
|
NWS
|
|
WYAIO
|
will you
accept, if
offered, the
position of
|
GEN
|
