What does becoming mean in a TAF?

What does becoming mean in a TAF?

BECMG – Becoming. Used to indicate a gradual change in some of the forecast elements. TAF – BECMG is always followed by a time group(HHHH) and does not exceed 4 hours.

What is a TAF in aviation?

The Terminal Area Forecast ( TAF ) is the official FAA forecast of aviation activity for U.S. airports. It contains active airports in the National Plan of Integrated Airport Systems ( NPIAS ) including FAA-towered airports, Federal contract-towered airports, non-federal towered airports, and non-towered airports.

Are METARs in AGL or MSL?

Remember, METAR and TAF report the height of clouds AGL, not MSL. OVC040 = Overcast at 4,000 ft above the airport. If the airport is 1,000 ft, cloud bases are then at 5,000 ft MSL.

How large of an area does a TAF cover?

TAFs are issued at least four times a day, every six hours, for major civil airfields: 0000, 0600, 1200 and 1800 UTC, and generally apply to a 24- or 30-hour period, and an area within approximately five statute miles (8.0 km) (or 5 nautical miles (9.3 km) in Canada) from the center of an airport runway complex.

How do I read a Metar file in Australia?

A (very) brief introduction to the Australian version of METAR code

  1. YWLM = location code for Williamtown, NSW.
  2. SPECI = this is a report about special or significant weather conditions.
  3. 1100Z = time in UTC.
  4. 18016KT = Wind is from 180 degrees (south) averaging 16 knots.
  5. 9999 = visibility in metres, i.e. 9999 metres or 10km.

How do you use Metar?


  1. Use the initial code letters to identify the type of report. If you’re looking at a METAR report, you will see it listed at the beginning.
  2. Note the station identifier after the report type.
  3. Read the next numbers to find the report’s date and time.
  4. Look for a short phrase explaining how the report was modified.

What does 9999 mean in Metar?

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 does a Metar stand for?

What is METAR/SPECI and what do the acronyms stand for? A1. 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.

What is FM Metar?

FM is used when rapid changes are expected at the specified time, and is given in: TAF format: FMddhhmm, for example: FM301000 means from 1000 UTC on the 30th or.

How much area does a Metar cover?

approximately 6 inches

What does PROB30 mean in a TAF?

a slight chance

How do you read aviation Metars?

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 ā€œZā€ 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 does VV mean in Metar?

vertical visibility is