A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

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T

U

V

W

X

Y

Z

 
A

AAA -   (or AAB, AAC ... etc., in sequence) Amended meteorological message (message type designator)
AAL -   Above aerodrome level
ABNDT -   Abundant
ABNML -   Abnormal
ABT -   About
ABV -   Above
Ac or AC -   Altocumulus
AC -   Anticipated Convection Outlook.
ACC -   Area Control Center or area control
ACCAS -   Altocumulus Castellanus
ACCID -   Notification of an aircraft accident
ACCUM -   Accumulate
ACFT -  Aircraft
ACK - Acknowledge
ACLT - Accelerate
ACLTD - Accelerated
ACLTG - Accelerating
ACLTS - Accelerates
ACPT - Accept or accepted
ACPY - Accompany
ACRS - Across
ACSL -   Altocumulus Standing Lenticular
ACT - Active or activated or activity
ACTV - Active
ACTVTY - Activity
ACYC - Anticyclone
AD - aerodrome
ADA - advisory area
ADDN - Addition or additional
ADJ - Adjacent
ADL - Additional
ADM -   Administrative Messages
ADQT - Adequate
ADQTLY - Adequately
ADR - Advisory route
ADRNDCK - Adirondack
ADVCT - Advect
ADVCTD - Advected
ADVCTG - Advecting
ADVCTN - Advection
ADVCTS - Advects
ADVIS -   Headwater Advisory Program
ADVN - Advance
ADVNG - Advancing
ADVS - Advisory service
ADVY - Advisory
ADVYS - Advisories
ADZ - Advise
AFCT - Affect
AFCTD - Affected
AFCTG - Affecting
AFD -   Area Forecast Discussion
AFDK - After dark
AFOS -   Automation of Field Operations and Services.
AFT - After ... (time or place)
AFTN - Afternoon
AGC -   Automatic Gain Control
AGL - Above ground level
AGN - Again
AGRD - Agreed
AGRMT - Agreement
AGRS - Agrees
AHD - Ahead
AHOS-S -   Automatic Hydrologic Observing System - Satellite
AHOS -   Automatic Hydrologic Observing System
AHOS-T -   Automatic Hydrologic Observing System - Telephone
AIRMET -   AIRman's METeorological Information
AK - Alaska
AL - Alabama
ALERT -   Automated Local Evaluation in Real Time
ALF - Aloft
ALG - Along
ALGHNY - Allegheny
ALQDS - All quadrants
ALSTG - Altimeter setting
ALT - Altitude
ALTA - Alberta
ALTHO - Although
ALTM - Altimeter
ALUTN - Aleutian
AMD - Amend or amended (used to indicate amended meteorological message; message type designator)
AMDD - Amended
AMDG - Amending
AMDT - Amendment
AMP - Amplify
AMPG - Amplifying
AMPLTD - Amplitude
AMS - Air mass
AMSL - Above mean sea level
AMT - Amount
ANLYS - Analysis
ANS - Answer
AOA - At or above
AOB -   At or Below
AP -   Anomalous Propagation or Airport
APCH - Approach
APCHG - Approaching
APCHS - Approaches
API -  Antecedent Precipitation Index
APLCN - Appalachian
APLCNS - Appalachians
APPR - Appear
APPRG - Appearing
APPRS - Appears
APR - April
APRNT - Apparent
APRNTLY - Apparently
APRX - Approximate or approximately
APRXLY - Approximately
APSG - After passing
AQI -   Air Quality Statement
AR - Arkansas
Arcus -  Arc Cloud
ARFOR - Area forecast (in aeronautical meteorological code)
ARND - Around
ARPT - Airport
ARR - Arrive or arrival
ART -   Automatic Radio Theodolite Master Control Unit
As or AS -   Altostratus
ASAP -   AHOS SHEF Automatic Processing System or as soon as possible
ASAPTRAN -   The software component of ASAP.
ASC - Ascent to or ascending to
ASH - Assistant Service Hydrologist
ASL - Above Sea Level
ASMD - As amended
ASOS -   Automated Surface Observing System.
ASSOCD - Associated
ASSOCN - Association
AT... - At (followed by time at which weather change is forecast to occur)
ATAD -   Automated Telephone Answering Device.
ATDTDCS -   Automated Tone Dial Telephone Data Collection System
ATLC - Atlantic
ATMU -   Air Transportable Mobile Unit
ATP... - At... (time or place)
ATTM - At this time
ATTN - Attention
AUG - August
AVBL - Available or availability
AVG - Average
AVN -   AViatioN model
AWC -   Aviation Weather Center
AWHPS -   Area Wide Hydrologic Prediction System
AWIPS -   Advanced Weather Interactive Processing System.
AWOS -   Automated Weather Observation System.
AWT - Awaiting
AZ - Arizona
AZM - Azimuth  


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