ADDS TAF Help

Text Data

In addition to the graphical plots, a textual interface is available to retrieve data in raw format. For example, to retrieve the latest TAF for Denver International Airport, enter the corresponding airport identifier (KDEN for Denver International Airport) into the ICAO Station ID field. You may enter as many stations as you wish, separating each station with a space and/or comma. You must use the full 4-letter ICAO abbreviation. For abbreviations, please refer to the list of airports around the world that report METARs.

If desired, a decoded view of the data can be selected. Each piece of data is shown in a human readable format. For example, the latest Denver TAF would be shown as:

TAF for:KDEN (Denver Intl, CO, US)
Text:KDEN 080943Z 0810/0912 24006KT 1/4SM FG VV001
Forecast period:1000 to 1600 UTC 08 March 2014
Forecast type:FROM: standard forecast or significant change
Winds:from the WSW (240 degrees) at 7 MPH (6 knots; 3.1 m/s)
Visibility: 0.25 miles ( 0.40 km)
Ceiling:indefinite ceiling with vertical visibility of 100 feet AGL
Clouds:obscured sky
Weather:FG (fog)
Text:TEMPO 0810/0812 4SM BR SCT004 SCT025 OVC050
Forecast period:1000 to 1200 UTC 08 March 2014
Forecast type:TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles ( 6 km)
Ceiling:5000 feet AGL
Clouds: scattered clouds at 400 feet AGL, scattered clouds at 2500 feet AGL, overcast cloud deck at 5000 feet AGL
Weather:BR (mist)
Text:FM081600 25006KT P6SM BKN005 BKN015

Note the color change for TEMPO groups.

URL Options

Here is a list of the URL options:

  • ids=id[+id...] - Specifies the stations to retrieve data
  • format={raw|decoded} - Specifies the format of output as either raw data or decoded output. The default is raw.
  • metars={on|off} - Specifies to retrieve the latest METAR. The default is off.
  • date=yyyymmddhhnn - This selects a specific date and time to display. ADDS saves several days of data so this can be used to show prior TAFs. The default is current.

Example: /taf/data?ids=KDEN&format=decoded&metars=on

TAF Board

The TAF board is a time series display of weather conditions. There are two formats for the board: condensed and expanded.

Condensed view

The condensed view lists any number of stations along the vertical axist and time along the horizontal axis (See Fig 1). The first column is the latest observation. Each box (hourly forecasts from TAF) is color coded based on the level of the hazard. Green represents no hazard, yellow minimal hazard, red significant hazard and purple major hazard. The letters in the box represent the cause of the hazard. They are as follows:

  • Ceil - Ceiling
  • Vis - Visibility
  • Wx - Weather (thunderstorms, freezing rain)
  • WSpd - Wind speed
  • WGst - Wind gusts

There could be multiple hazards but only the top one from this list if shown.

TAF Board condensed
Figure 1: TAF Board condensed view

The cutoffs for each color are shown in Fig. 2. The default criteria use the flight category cutoffs

TAF Board legend
Figure 2: TAF Board color criteria

For more detailed information for each site, click on the station identifier. This will go to the expanded view for each site. In this view, each weather condition is listed along the vertical axis (See Fig. 3). These are:

  • Vis - Visibility in miles
  • Ceil - Cloud ceiling in 100s feet
  • Cover - Cloud cover: CLR, FEW, SCT, BKN, OVC
  • FltCat - Flight category: VFR, MVFR, IFR, LIFR
  • Wx - Weather
  • WDir - Wind direction
  • WSpd - Wind speed in knots
  • WGst - Wind gusts in knots
TAF Board expanded
Figure 3: TAF Board expanded view

Runway Winds

In addition, for airports with runway information, cross and head wind values are also displayed. These are available for each runway set for that airport. If an airport has three parallel runways, only one is shown. The runway is shown as RXX/XX with the primary and reciprocal headings. The wind data is computed based on actual runway direction relative to due north.

  • XWnd - Cross wind speed in knots. Positive values represent winds from left to right given the first runway listed. For if the runway is R13/31, the cross wind data is for runway 13. If it's runway 31, invert the data.
  • HWnd - Head wind speed in knots. Positive values represent head winds and negative values represent tail winds. If the value for runway R13/31 is -9, then there is a 9 knot tail wind on runway 13. This would be a 9 knot head wind for runway 31.

URL Options

Here is a list of the URL options:

  • ids=id[+id...] - Specifies the stations to retrieve data
  • format={condensed|expanded} - Specifies the format of output as either condensed or expanded. The default is condensed.
  • date=yyyymmddhhnn - This selects a specific date and time to display. ADDS saves a week of METAR data so this can be used to get older METAR data. The default is current.



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