Quick Answer: What Is Taf In Aviation?

What is difference between Metar and TAF?

METAR is the international standard code format for hourly surface weather observations which is analogous to the SA coding currently used in the US. The acronym roughly translates from French as Aviation Routine Weather Report. TAF is the international standard code format for terminal forecasts issued for airports.

What does a TAF include?

A complete TAF includes a forecast of surface wind (speed and direction), surface visibility, weather, obstructions to vision (if any), clouds (or vertical visibility into a surface-based obscuration), Low Level Wind Shear (LLWS), and any expected significant change(s) to one or more of these elements during the

How many times a day is a TAF issued?

TAFs are prepared four times a day and are issued at 2330, 0530, 1130, and 1730 UTC.

How are TAFs generated?

TAFs are issued every three hours for military airfields and some civil airfields and cover a period ranging from 3 hours to 30 hours. TAFs complement and use similar encoding to METAR reports. They are produced by a human forecaster based on the ground.

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How long does a TAF last?

Routine TAFs are valid for a 24-hour period and issued four times daily: 00Z, 06Z, 12Z, and 18Z, and are amended (updated) as conditions require.

How long is Metar valid?

how long is a metar valid or updated? How long is a TAF valid or updated? METAR is used to tell the actual meteorological conditions on a station, airport or area indicating day/time wind, clouds, precipitations, altimeter pressure and temperature, it has a duration of 60 minutes and it is updated every hour.

What does 9999 mean on a TAF?

9999. This value represents a visibility greater than 9000. meters (7 SM or more). The contraction CAVOK (ceiling and visibility OK) may be used when there is no significant weather, the visibility is 10 km or greater, and the ceilings are greater than 5,000 ft.

How do you write a TAF?


  1. TAFs are issued in the following format: [Type of Report] [ICAO Station Identifier] [Date and Time of Origin] [Valid Period Date and Time] [Forecast Meteorological Conditions]
  2. Forecast date and time of origin in the TAF are depicted in two ways:
  3. TAFs use the same codes as METAR weather reports.

What does Shra mean in a TAF?

1. The weather groups shall be constructed by considering columns 1 to 5 in the table above in sequence, i.e. intensity, followed by description, followed by weather phenomena, e.g. heavy rain shower(s) is coded as + SHRA 2. To denote moderate intensity no entry or symbol is used.

How far does a TAF cover?

TAF stands for Terminal Aerodrome Forecast. It is a report released by large airports that summarizes the weather forecast for the area covered by five statute miles from the location of the airport. A TAF report is valid for 24 to 30-hour time periods and is typically updated four times a day.

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How far does Metar cover?

An automated METAR with no human supervision covers the conditions within approximately 6 inches of the weather station reporting it (for example, a badly positioned AWOS/ASOS station may be shielded from wind in some directions which affects what it reports).

How do you read a TAF file?

The date and time are formatted using two sets of four digits each with the first two digits representing the day of the month and the second two the 24-hour time in hours only (no minutes since TAFS are issued on the hour). The first set of digits is the start date/time and the second is the end date/time.

WHO issues TAFs?

N O A A N A T I O N A L W E A T H E R S E R V I C E A TAF is the international standard code format for terminal forecasts issued for airports. TAFs are valid for a 30 hour time period and are issued 4 times a day at 6 hour intervals.

What does CB mean in Metar?

CB – Cumulonimbus. CLR – Sky clear at or below 12,000AGL. FEW – Few cloud layer 0/8ths to 2/8ths. OVC – Overcast cloud layer 8/8ths coverage.

What does 00000KT mean?

In the case of mean wind speeds of 3 knots or less and a variable direction, wind direction (ddd) is encoded as “VRB”. Wind speeds (ff) are two digits (or three digits if required), in knots. Calm is encoded as ” 00000KT “. In Canada and the U.S., the unit for wind speed is knots (nautical miles per hour).

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