- 1 What does BKN mean in weather?
- 2 What are METARs and TAFS?
- 3 How do I read METARs data?
- 4 How do I read a TAF report?
- 5 Is Metar AGL or MSL?
- 6 What is 9999 in a TAF?
- 7 What does Cavok mean?
- 8 How long is a Metar valid?
- 9 How do I decode a metar report?
- 10 What is a G Airmet?
- 11 What is the difference between Metar and TAF in aviation?
- 12 What are the numbers at the end of a Metar?
- 13 How are METARs generated?
- 14 Are Metar winds true or magnetic?
What does BKN mean in weather?
BKN – Broken cloud layer 5/8ths to 7/8ths. 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 are METARs and TAFS?
METAR stands for Meteorological Aerodrome Report. 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.
How do I read METARs data?
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.
How do I read a TAF report?
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.
Is Metar AGL or MSL?
Height is important, especially in the mountains. Remember, METAR and TAF report the height of clouds AGL, not MSL.
What is 9999 in a TAF?
The largest reportable metric value is 9999. This value represents a visibility greater than 9000 meters (7 SM or more).
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.
How long is a Metar valid?
Validity: Issued every hour, usually 55~59 past the hour. Data may be up to 15 minutes old, should not be older. Valid for 1 hour or until the next released report.
How do I decode a metar report?
Decoding a METAR
- PHNL = the airfield, Honolulu’s Daniel K.
- 250953Z = the date and time of the report.
- 05007G17KT = the wind conditions.
- 10SM = visibility.
- FEW024 / FEW040 = cloud cover.
- 27/19 = the temperature and dewpoint.
- A3001 = the atmospheric pressure, a.k.a. altimeter setting.
What is a G Airmet?
A G – AIRMET is a graphical advisory of weather that may be hazardous to aircraft, but are less severe than SIGMETs. They are only valid at specific time “snapshots”. Forecasters create graphical objects depicting the areas and attributes of AIRMET hazards, which are distributed in BUFR file format.
What is the difference between Metar and TAF in aviation?
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 are the numbers at the end of a Metar?
The first three numbers, “350” indicate the wind direction it’s coming from. The next two numbers, “45” indicate the wind speed in knots. The number after the slash is the time after the hour. The “20” in this case means the peak wind happened at 20 past the hour.
How are METARs generated?
Origin. METARs typically come from airports or permanent weather observation stations. Reports are generated once an hour or half-hour at most stations, but if conditions change significantly at a staffed location, a report known as a special (SPECI) may be issued. (Such as KPLU which reports 3 per hour.)
Are Metar winds true or magnetic?
METAR winds are true and ATIS winds are magnetic, except Digital ATIS.