Aeronautical meteorology abbreviations.
| A | |||
| ABT | About | AIREP SPECIAL | Air report of special meteorological observation |
| ABV | Above | ALT | Altitude |
| AC | Altocumulus | AMD | Amend, amended |
| ACT | Active, activated | AS | Altostratus |
| AIREP | Plain language form of air report | ASSW | Associated with |
| B | |||
| BASE | Cloud base | BLW | Below |
| BKN | Broken | BTL | Between layers |
| BLO | Below clouds | BTN | Between |
| BLSN | Blowing snow | ||
| C | |||
| C | Degrees Celsius | CLD | Clouds |
| CAT | Clear Air Turbulence | CNS | Continuous |
| CB | Cumulonimbus | CS | Cirrostratus |
| CAVOK | Cloud, visibility and weather better than prescribed values | COT | Coast |
| CC | Cirrocumulus | CUF | Cumuliform |
| CI | Cirrus | CU | Cumulus |
| D | |||
| DEG | Degrees | DTRT | Deteriorate, deteriorating |
| DMO | Dependent Meteorological office | DUST | Duststorm |
| DP | Dewpoint | DZ | Drizzle |
| E | |||
| EXP | Expect(ed), expecting | ||
| F | |||
| FBL | Light (to qualify icing, turbulence etc) | FRQ | Frequent |
| FCST | Forecast | FT | Feet |
| FL | Flight Level | FZ | Freezing |
| FPM | Feet per minute | FZDZ | Freezing drizzle |
| FRONT | Front | FZRA | Freezing rain |
| G | |||
| GND | Ground | GRADU | Gradual(ly) |
|
H | |||
| H | High pressure | HURCN | Hurricane |
| HAIL | Hail | HVY | Heavy |
| I | |||
| IAO | In and out of clouds | INC | In Clouds |
| ICE | Icing | INS | Inches |
| IFR | Instrument flight rules | INTER | Intermittent |
| IMC | Instrument meteorological conditions | INTST | Intensity |
| IMPR | Improve, improving | INTSF | Intensify(ing) |
| J | |||
| JTST | Jet stream | ||
| K | |||
| KM | Kilometers | KT | Knots |
| KMH | Kilometers per hour | ||
| L | |||
| L | Low pressure area | LOC | Locally |
| LAN | Land | LSQ | Line squall |
| LGT | Light | LYR | Layer(ed) |
| M | |||
| M | Meters | MOD | Moderate (icing, turbulence etc.) |
| MAX | Maximum | MOV | Move, moving |
| MB | Millibars | MPS | Meters per second |
| MET | Meteorological, meteorology | MS | Minus |
| MIN | Minutes | MSL | Mean sea level |
| MMO | Main meteorological office | MTW | Mountain waves |
| MNM | Minimum | MWO | Meteorological watch office |
| N | |||
| NC | No change | NOSIG | No significant change |
| NIL | None, nothing | NS | Nimbostratus |
| NM | Nautical mile(s) | NSC | No significant clouds |
| O | |||
| OBS | Observe(d), observation | OKTA | Eight of sky cover |
| OBSC | Obscure(d), obscuring | OTP | On top |
| OCNL | Occasional(ly) | OVC | Overcast |
| P | |||
| PROB | Probability | PS | Plus |
| R | |||
| RA | Rain | RASN | Rain and snow |
| RAPID | Rapid(ly) | RVR | Runway visual range |
| S | |||
| SAND | Sandstorm | SHWR | Shower |
| SC | Stratocumulus | SIGMET | Information from MWO concerning certain meteorological phenomena |
| SCT | Scattered | SLW | Slow |
| SEC | Seconds | SMK | Smoke |
| SEV | Severe (icing, turbulence) | SMO | Supplementary meteorological office |
| SFC | Surface | SN | Snow |
| SH | Shower | ||
| T | |||
| T | Temperature | TEMPO | Temporary, temporarily |
| TAF | Terminal aerodrome forecast in code | TEND | Trend or tending to |
| TAIL | Tail wind | TOP | Cloud top |
| TCU | Towering Cumulus | TS | Thunderstorm |
| TDO | Tornado | TURB | Turbulence |
| U | |||
| UNL | Unlimited | UTC | Universal Time Coordinated |
| V | |||
| VER | Vertical | VOLMET | Meteorological information for aircraft in flight |
| VFR | Visual flight rules | VRBL | Variable |
| VIS | Visibility | VSP | Vertical speed |
| VMS | Visual meteorological conditions | VV | Vertical visibility |
| W | |||
| WDSPR | Widespread | WTSPT | Waterspout |
| WKN | Weaken(ing) | WX | Weather |