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Weather

Weather Data : METAR and TAF

METAR = METeorological Aerodrome Report

TAF = Terminal Area Forecast

Both are** coded weather reports, a **METAR is an observation (now), a TAF is a forecast (future, up to 30 hours ahead). Both use a similar format and abbreviations.

These weather products can be obtained from AVIATIONWEATHER.GOV or 1800WXBRIEF.COM by entering the desired airport’s 4 letter identifier code ( i.e KLAX, KSFO)

Small airports may not deliver METARs or TAFs, and TAFs are usually only available at larger airports.

Unfortunately for those new to aviation, the FAA wants remote-pilots to learn how to read raw METARs and TAFs, you can expect 1 to 3 questions covering these on the test. For real world use, these are available in a plain language format (decoded) and are a great tool to obtain accurate weather information.

Remember this for the knowledge test:

  • Wind directions are reported in *true heading. *
  • Cloud **heights are reported in hundreds of feet above ground level.**
  • A cloud ceiling is a broken or overcast cloud layer.

Examples and decoding table below. For more details consult:

A raw METAR looks like this:

KIAD 180005Z 19008KT 10SM TS SCT060CB BKN090 BKN200 31/21 A3002 RMK AO2 TSB04 FRQ LTGICCCCG SW TS SW MOV NE T03060211

Below is the same METAR in decoded format:

METAR for:KIAD (Washington/Dulles In, VA, US)
Date and Time:the 18th of the current month at 00:05 UTC (Universal Time Coordinated)
Winds:from the S (190 degrees) at 9 MPH (8 knots; 4.1 m/s)
Visibility:10 or more sm (16+ km)
Weather:TS (thunderstorm)
Clouds:scattered cumulonimbus clouds at 6000 feet AGL, broken clouds at 9000 feet AGL, broken clouds at 20000 feet AGL
Temperature:30.6°C ( 87°F)
Dewpoint:21.1°C ( 70°F) [RH = 57%]
Pressure (altimeter):30.02 inches Hg (1016.7 mb)

Sample TAF:

KIAD 172349Z 1800/1906 21005KT 6SM -TSRA BR OVC040CB

TEMPO 1800/1802 26020G35KT 1/2SM +TSRA FG OVC030CB

FM180300 VRB03KT 6SM -SHRA BR VCTS OVC040CB

FM180600 00000KT P6SM VCSH OVC060

FM181300 32006KT P6SM SCT050 SCT150

Decoded TAF:

METAR for:KIAD (Washington/Dulles In, VA, US)
Text:KIAD 180005Z 19008KT 10SM TS SCT060CB BKN090 BKN200 31/21 A3002 RMK AO2 TSB04 FRQ LTGICCCCG SW TS SW MOV NE T03060211
Winds:from the S (190 degrees) at 9 MPH (8 knots; 4.1 m/s)
Temperature:30.6°C ( 87°F)
Dewpoint:21.1°C ( 70°F) [RH = 57%]
Pressure (altimeter):30.02 inches Hg (1016.7 mb)
Visibility:10 or more sm (16+ km)
Ceiling:9000 feet AGL
Clouds:scattered clouds at 6000 feet AGL, broken clouds at 9000 feet AGL, broken clouds at 20000 feet AGL
Weather:TS (thunderstorm)
TAF for:KIAD (Washington/Dulles In, VA, US) issued at 2349 UTC 17 Aug 2016
Text:KIAD 172349Z 1800/1906 21005KT 6SM -TSRA BR OVC040CB
Forecast period:0000 to 0300 UTC 18 August 2016
Forecast type:FROM: standard forecast or significant change
Winds:from the SSW (210 degrees) at 6 MPH (5 knots; 2.6 m/s)
Visibility:6 sm ( 10 km)
Ceiling:4000 feet AGL
Clouds:overcast cloud deck at 4000 feet AGL
Weather:-TSRA BR (light rain associated with thunderstorm(s), mist)
Text:TEMPO 1800/1802 26020G35KT 1/2SM +TSRA FG OVC030CB
Forecast period:0000 to 0200 UTC 18 August 2016
Forecast type:TEMPORARY: The following changes expected for less than half the time period
Winds:from the W (260 degrees) at 23 MPH (20 knots; 10.3 m/s) gusting to 40 MPH (35 knots; 18.0 m/s)
Visibility:0.50 sm ( 0.80 km)
Ceiling:3000 feet AGL
Clouds:overcast cloud deck at 3000 feet AGL
Weather:+TSRA FG (heavy rain associated with thunderstorm(s), fog)
Text:FM180300 VRB03KT 6SM -SHRA BR VCTS OVC040CB
Forecast period:0300 to 0600 UTC 18 August 2016
Forecast type:FROM: standard forecast or significant change
Winds:variable direction winds at 3 MPH (3 knots; 1.5 m/s)
Visibility:6 sm ( 10 km)
Ceiling:4000 feet AGL
Clouds:overcast cloud deck at 4000 feet AGL
Weather:-SHRA BR VCTS (light rain showers, mist, thunderstorm in vicinity)
Text:FM180600 00000KT P6SM VCSH OVC060
Forecast period:0600 to 1300 UTC 18 August 2016
Forecast type:FROM: standard forecast or significant change
Winds:calm
Visibility:6 or more sm (10+ km)
Ceiling:6000 feet AGL
Clouds:overcast cloud deck at 6000 feet AGL
Weather:VCSH (showers in vicinity)
Text:FM181300 32006KT P6SM SCT050 SCT150
Forecast period:1300 UTC 18 August 2016 to 0600 UTC 19 August 2016
Forecast type:FROM: standard forecast or significant change
Winds:from the NW (320 degrees) at 7 MPH (6 knots; 3.1 m/s)
Visibility:6 or more sm (10+ km)
Ceiling:at least 12,000 feet AGL
Clouds:scattered clouds at 5000 feet AGL, scattered clouds at 15000 feet AGL

Use the following decoding table from NOAA and the FAA:

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Practice decoding the METARs and TAFs from the AIRMAN KNOWLEDGE TESTING SUPPLEMENT in figures 12 and 15.