Acronyms: A's

AAA	(or AAB, AAC, AAD... etc., in sequence) Amended meteorological message (a 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 ASA
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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