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  2. METAR - Wikipedia

    en.wikipedia.org/wiki/METAR

    metar kttn 051853z 04011kt 1/2sm vcts sn fzfg bkn003 ovc010 m02/m02 a3006 rmk ao2 tsb40 slp176 p0002 t10171017= [10] METAR indicates that the following is a standard hourly observation. KTTN is the ICAO identifier for the Trenton-Mercer Airport .

  3. Trend type forecast - Wikipedia

    en.wikipedia.org/wiki/Trend_Type_Forecast

    A TTF is a professionally considered forecast for weather over a two-hour period, [1] and is based on an actual weather report, such as a METAR or SPECI and appended to the end of it. [1] A TTF is similar to or sometimes in addition to a TAF, a terminal aerodrome forecast, but during the TTF's validity period is considered superior to a TAF.

  4. Colour state - Wikipedia

    en.wikipedia.org/wiki/Colour_state

    The colour state may be appended to a METAR report. A short period forecast called a TREND which covers the following two hours from the observation may also be added, often with reference to the colour state.

  5. Visibility - Wikipedia

    en.wikipedia.org/wiki/Visibility

    In meteorology, visibility is the measure of the distance at which an object or light can be clearly discerned. It depends on the transparency of the surrounding air and as such, it is unchanging no matter the ambient light level or time of day.

  6. Terminal aerodrome forecast - Wikipedia

    en.wikipedia.org/wiki/Terminal_aerodrome_forecast

    In meteorology and aviation, terminal aerodrome forecast (TAF) is a format for reporting weather forecast information, [1] particularly as it relates to aviation. TAFs are issued at least four times a day, every six hours, for major civil airfields: 0000, 0600, 1200 and 1800 UTC, [2] and generally apply to a 24- or 30-hour period, and an area within approximately five statute miles (8.0 km ...

  7. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    The QNH altimeter setting is one of the data included in METAR messages. An alternative setting is QFE or SPS/STD: An alternative setting is QFE or SPS/STD: QNH - is the barometric altimeter setting that causes an altimeter to read aircraft elevation above mean sea level - altitude ( AMSL - above mean sea level) in ISA temperature conditions in ...

  8. Surface weather observation - Wikipedia

    en.wikipedia.org/wiki/Surface_weather_observation

    ASOS sensors, located at Salinas, California. Surface weather observations have traditionally been taken at airports due to safety concerns during takeoffs and landings. The ICAO defines the International Standard Atmosphere (also known as ICAO Standard Atmosphere), which is the model of the standard variation of pressure, temperature, density, and viscosity with elevation/altitude in the ...

  9. Precipitation - Wikipedia

    en.wikipedia.org/wiki/Precipitation

    Within METAR code, GR is used to indicate larger hail, of a diameter of at least 6.4 millimetres (0.25 in). GR is derived from the French word grêle. Smaller-sized hail, as well as snow pellets, use the coding of GS, which is short for the French word grésil. [ 35 ]

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