How do I read TAF weather?

How do I read a TAF in Australia?

Decoding a TAF

  1. Message identification (ie TAF)
  2. Location identifier.
  3. Time of origin (UTC)
  4. Validity period.
  5. Forecast surface wind.
  6. Forecast visibility.
  7. Forecast significant weather.
  8. Forecast cloud amount and height.

What are TAFs and Metars?

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.

Is TAF or MOS more accurate?

Pilots should use MOS in a similar way they may use a TAF keeping in mind that TAFs are constructed by highly trained meteorologists and will ordinarily be more accurate than a MOS forecast for the same airport.

What is a weather TAF?

A Terminal Aerodrome Forecast (TAF) is a concise statement of the expected meteorological conditions at an airport during a specified period (usually 24 hours). … The TAF code, as described here, is the one used in the United States. TAFs use the same weather code found in METAR weather reports.

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What does 9999 mean in 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.

What is TX and TN in TAF?

TX – Indicator for Maximum temperature. TtTt – Temperature value in Celsius. TN – Indicator for Minimum temperature. HH – Forecast hour, i.e. the time(hour) when the temperature is expected.


Heights in METAR and TAF are always stated as height AGL. On the other hand, heights in graphic area forecasts (GFA) and PIREPs are normally stated as height ASL, since terrain heights are variable over the larger area covered.

How do you read an aviation weather briefing?

The first two digits are the date, the 16th of the month, and the last four digits are the time of the METAR, which is always given in coordinated universal time (UTC), otherwise known as Zulu time. A “Z” is appended to the end of the time to denote that the time is given in Zulu time (UTC) as opposed to local time.

What is a TAF 3?

A TAF3 service is a TAF issued routinely every three hours and receives priority, pro-active amendments to ensure it contains the latest forecast information. Amendments within the first 3 hours of TAF validity are currently masked by changes in the TTF.

What is Qnh on a TAF?

QNH. The QNH is the atmospheric pressure corrected to mean sea level (based on International Standard Atmosphere conditions throughout the height difference) and is reported in the METAR rounded down to the nearest whole hectopascal. Some aerodromes report the QNH pressure in the METAR in inches of mercury.

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Which is better TAF or MOS?

While TAFs provide the official forecast for 666 airports throughout the US and its territories, MOS provides weather guidance for over 2100 airports including some military air bases. … You’ll get a refreshed forecast at an airport that will tend to track better with the actual weather than with the area forecast.

What is Mos weather in ForeFlight?

MOS is an automated weather product that generates forecasts for over 2000 U.S. airports, including many that do not receive official TAFs.

What does TAF and MOS stand for?

Back in December we announced a new forecast tool in ForeFlight Mobile called Model Output Statistics or MOS. A TAF-like forecast, MOS provides site-specific weather guidance to pilots for hundreds of airports where a TAF is not provided by the National Weather Service (NWS).