AWH 3-12

Chapter 3, Overview of Aviation Weather Information 3-12 Acronym/Abbreviation Definition HI Hawaii HZ Haze ICAO International Civil Aviation Organization IFR Instrument Flight Rules kt knot LIFR Low Instrument Flight Rules LLWAS Low-Level Wind Shear Alert System LLWS Low-Level Wind Shear METAR Aviation Routine Weather Report MIFG Shallow Fog MIS Meteorological Impact Statement MSL Mean Sea Level Mtn Obsc Mountain Obscuration MVFR Marginal Visual Flight Rules NIL SIG No Significant NOAA National Oceanic and Atmospheric Administration Obsc Obscuration OVC Overcast PIREP Pilot Weather Report Precip Precipitation PRFG Partial Fog Prog Prognostic RMK Remarks RTMA Real-Time Mesoscale Analysis SAW Aviation Watch Notification Message SIGMET Significant Meteorological Information SIGWX Significant Weather SLD Supercooled Large Drop SM statute mile SPECI Aviation Selected Special Weather Report SS Sandstorm TAF Terminal Aerodrome Forecast TC Tropical Cyclone TCA Tropical Cyclone Advisory