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  2. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    Specifically, the weather must be better than basic VFR weather minima, i.e., in visual meteorological conditions (VMC), as specified in the rules of the relevant aviation authority. The pilot must be able to operate the aircraft with visual reference to the ground, and by visually avoiding obstructions and other aircraft.

  3. Visual meteorological conditions - Wikipedia

    en.wikipedia.org/wiki/Visual_meteorological...

    VFR / VMC visibility requirements in the US. In aviation, visual meteorological conditions (VMC) is an aviation flight category in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft maintaining visual separation from terrain and other aircraft.

  4. VFR over-the-top - Wikipedia

    en.wikipedia.org/wiki/VFR_Over-The-Top

    The flight visibility at the cruising altitude of the aircraft must be at least 5 miles and the weather at the destination aerodrome must be forecast to have a sky condition of scattered cloud or better, a ground visibility of 5 miles or greater with no forecast of precipitation, fog, thunderstorm or blowing snow, and that these conditions must ...

  5. GAFOR - Wikipedia

    en.wikipedia.org/wiki/GAFOR

    GAFOR ("General Aviation Forecast") is a format for reporting weather information for aviation purposes. The GAFOR is used in many European countries. In order to easy transmit and understand GAFOR forecasts, the original (local) names are systematically replaced by a code number. There are two kinds of application:

  6. Instrument flight rules - Wikipedia

    en.wikipedia.org/wiki/Instrument_flight_rules

    For example, an IFR flight that encounters visual meteorological conditions (VMC) en route does not automatically change to a VFR flight, and the flight must still follow all IFR procedures regardless of weather conditions. In the US, weather conditions are forecast broadly as VFR, MVFR (marginal visual flight rules), IFR, or LIFR (low ...

  7. Area forecast - Wikipedia

    en.wikipedia.org/wiki/Area_forecast

    Area forecast divides the conterminous 48 states into 6 regions, with each region centered at: SFO, SLC, CHI, DFW, BOS, and MIA. An Aviation Area Forecast (FA or ARFOR) was a message product of the National Weather Service (NWS) in the United States. It has been replaced by Graphic Area Forecasts, or GFA, in 2017. [1]

  8. METAR - Wikipedia

    en.wikipedia.org/wiki/METAR

    In addition, a short period forecast called a TREND may be added at the end of the METAR covering likely changes in weather conditions in the two hours following the observation. These are in the same format as a Terminal Aerodrome Forecast (TAF). The complement to METARs, reporting forecast weather rather than current weather, are TAFs.

  9. List of National Weather Service Weather Forecast Offices

    en.wikipedia.org/wiki/List_of_National_Weather...

    Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.