| ABBRIVIATION | TERM |
|---|---|
| KT | Knots |
| MPS | Meters per second |
| AO1 | Automated Observation without precipitation discriminator (rain/snow) |
| AO2 | Automated Observation with precipitation discriminator (rain/snow) |
| AMD | Amended Forecast (TAF) |
| BECMG | Becoming (expected between 2 digit beginning hour and 2 digit ending hour) |
| BKN | Broken (5-7 oktas) |
| CLR | Clear at or below 12,000 feet (AWOS/ASOS report) |
| COR | Correction to the observation |
| FEW | 1 or 2 octas (eighths) cloud coverage |
| FEW | 1 or 2 oktas (eighths) cloud coverage |
| FM | From (4 digit beginning time in hours and minutes) |
| LDG | Landing |
| M | In temperature field means "minus" or below Zero |
| M | In RVR listing indicates visibility less than lowest reportable sensor value (eg. M600) |
| NO | Not available (eg SLPNO, RVRNO) |
| NSW | No Significant Weather |
| OVC | Overcast (8 oktas) |
| 9999 | Visibility in meters (9999 means greater than 10 km) |
| P | In RVR indicates visibility greater than highest reportable sensor value (eg P6000FT) |
| P6SM | Visibility greater than 6 SM (TAF only) |
| PROB4O | Probability 40 percent |
| R | Runway (used in RVR measurement) |
| RMK | Remark |
| RY/RWY | Runway |
| SCT | Scattered (3-4 oktas) |
| SKC | Sky Clear (0 oktas) |
| SLP | Sea Level Pressure (eg., 1013 reported as 013) |
| SM | Statute mile(s) |
| SPECI | Special Report |
| TEMPO | Temporary changes expected (between 2 digit beginning hour and 2 digit ending hour) |
| TKOF | Takeoff |
| T01760158, 10142, 20012 and 401120084 | In Remarks examples of temperature information |
| V | Varies (wind direction and RVR) |
| VC | Vicinity |
| VRB | Variable wind direction when speed is less than or equal to 6 knots |
| VV | Vertical Visibility (Indefinite Ceiling) |
| WS | Wind shear (In TAFs, low level and not associated with convective activity) |
| ATIS | automatic terminal information service |
| ft | feet |
| km | unit of distance |
| kt | knots |
| MET | meteorology or meteorological |
| METAR | routine aviation aerodrome weather report |
| RVR | runway visual range |