Question: What Are Taf For Aviation?

What is the difference between a Metar and a 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 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.

What is Metar TAF?

METAR stands for Meteorological Aerodrome Report. A TAF report is valid for 24 to 30-hour time periods and is typically updated four times a day. Thus, the distinction is quite clear – a METAR pertains to current weather conditions, while a TAF pertains forecasted weather for the next 24 to 30 hours.

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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 VCSH mean in a TAF?


METAR Code Description
VCTS Vicinity thunderstorm
VIRGA Virga or precipitation not hitting ground
VCSH Vicinity showers
TS Thunderstorm with or without precipitation


Are TAF Times in Zulu?

A “Z” follows the date and time grouping to remind pilots that like other aviation times, the time listed in the TAF is in UTC, or “ Zulu ” time, not local time.

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How far does a 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).

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.

How often is TAF updated?

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 TAF stand for in text?

Summary of Key Points

Definition: Tell a Friend
Type: Abbreviation
Guessability: 2: Quite easy to guess
Typical Users: Adults and Teenagers

What does Cavok mean?

The Visibility, Cloud, and Weather groups are replaced by the term CAVOK (cloud and visibility OK) when the following conditions exist simultaneously: Visibility is 10km or more.

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