| 14 CFR | Title 14 of the Code of Federal Regulations |
| 3D | Three Dimensional |
| A | Arctic |
| AAG | Alaska Aviation Guidance |
| AAWU | Alaska Aviation Weather Unit |
| AC | Advisory Circular |
| AC | Convective Outlook |
| ACARS | Aircraft Communications Addressing and Reporting System |
| ACFJ | Australia, Canada, France, and Japan |
| ACSL | Altocumulus Standing Lenticular |
| ADS-B | Automatic Dependent Surveillance-Broadcast |
| AFD | Aviation Forecast Discussion |
| AFIS | Automatic Flight Information Service |
| AGL | Above Ground Level |
| AIM | Aeronautical Information Manual |
| AIREP | Aircraft Report |
| AIRMET | Airmen’s Meteorological Information |
| ALP | Airport Location Point |
| AMDAR | Aircraft Meteorological Data Relay |
| AP | Anomalous Propagation |
| app | Application |
| ARTCC | Air Route Traffic Control Center |
| ASI-AD | Aviation Safety Inspector—Aircraft Dispatcher |
| ASOS | Automated Surface Observing System |
| ATC | Air Traffic Control |
| ATCSCC | Air Traffic Control Systems Command Center |
| ATCT | Air Traffic Control Tower |
| ATIS | Automatic Terminal Information Service |
| AWC | Aviation Weather Center |
| AWIPS | Advanced Weather Interactive Processing System |
| AWOS | Automated Weather Observing System |
| AWRP | Aviation Weather Research Program |
| AWW | Airport Weather Warning Note: AWW formerly stood for the Alert Severe Weather Watch Bulletin as well as the Severe Weather Forecast Alert. |
| ºC or C | degrees Celsius or Celsius |
| c | Continental |
| cA | Continental Arctic |
| CAPE | Convective Available Potential Energy |
| CAT | Clear Air Turbulence |
| Cb | Cumulonimbus |
| CCSL | Cirrocumulus Standing Lenticular |
| CH | Certificate Holder |
| CIP | Current Icing Product |
| CIT | Convectively Induced Turbulence |
| cm | centimeter |
| C-MAN | Coastal-Marine Automated Network |
| CME | Coronal Mass Ejection |
| CMO | Certificate Management Office |
| CONUS | Contiguous United States |
| cP | Continental Polar |
| CPHC | Central Pacific Hurricane Center |
| CRC | China-Russian Federation Consortium |
| cT | Continental Tropical |
| CWA | Center Weather Advisory |
| CWSU | Center Weather Service Unit |
| dBZ | decibels of Z |
| DO | Director of Operations |
| DOC | Department of Commerce |
| DOD | Department of Defense |
| DOT | Department of Transportation |
| E | East |
| ECFP | Extended Convective Forecast Product |
| EDR | Eddy Dissipation Rate |
| EF | Enhanced Fujita |
| EFB | Electronic Flight Bag |
| ENE | East-Northeast |
| ESE | East-Southeast |
| ETA | Estimated Time of Arrival |
| EUV | Extreme Ultraviolet |
| EWINS | Enhanced Weather Information System |
| ºF or F | degrees Fahrenheit or Fahrenheit |
| FA | Area Forecast |
| FAA | Federal Aviation Administration |
| FACA | Area Forecast for Caribbean |
| FAGX | Area Forecast for Gulf of Mexico |
| FB | Wind and Temperature Aloft Forecast |
| FIP | Forecast Icing Product |
| FIR | Flight Information Region |
| FIS | Flight Information Service |
| FIS-B | Flight Information Service-Broadcast |
| FL | Flight Level |
| FOC | Flight Operations Center |
| fpm | feet per minute |
| FSS | Flight Service Station |
| ft | foot |
| g | gram |
| GA | General Aviation |
| GCR | Galactic Cosmic Rays |
| GFA | Graphical Forecasts for Aviation |
| GFS | Global Forecast System |
| GNSS | Global Navigation Satellite System |
| GOES | Geostationary Operational Environmental Satellite |
| GPS | Global Positioning System |
| GTG | Graphical Turbulence Guidance |
| HEMS | Helicopter Emergency Medical Services |
| HF | High Frequency |
| HF COM | High Frequency Communications |
| Hg | Mercury |
| HIWC | High Ice Water Content |
| hPa | hectopascal |
| hr | hour |
| HRRR | High Resolution Rapid Refresh |
| IAP | Instrument Approach Procedure |
| IATA | International Air Transport Association |
| ICAO | International Civil Aviation Organization |
| IFR | Instrument Flight Rules |
| IMC | Instrument Meteorological Conditions |
| in | inch |
| inHg | inches of mercury |
| IR | Infrared |
| ITCZ | Intertropical Convergence Zone |
| ITWS | Integrated Terminal Weather System |
| J | joule |
| J/g | joules per gram |
| J g-1 K-1 | joules per gram Kelvin |
