Short-term TAF Data Access
On or about April 4th, 2012, requests for TAFS through this service will be redirected to
This redirection is part of a larger effort to reduce duplication of effort within the National Weather Service.
The website above offers the same functionality. It also needs to be noted that the NWS Aviation Weather Center
operated website above is the only FAA approved source of aviation weather over the Internet to be used for
pilot briefings. Please update bookmarks, links, etc..
Current and recent Short-term
Terminal Aerodrome Forecasts from around the world are
available from the NWS either through this presentation or via anonymous FTP at
ftp://tgftp.nws.noaa.gov/data/forecasts/shorttaf. Short-term TAFs are
available as individual forecasts or in cycle files. The information available here is represented in
To display the most recent Short-term TAF for one ore more observing locations, enter the four-character ICAO
Location Indicators in the field below, separated by one or more blanks.
Enter one or more four-character ICAO Location Indicators below.
Make sure to enter one or more spaces between each indicator:
Cycle files containing short-term TAFs
are available here and via
FTP from weather.noaa.gov in the /data/forecasts/shorttaf/cycles directory.
Files are named hhZ.TXT where hh is the cycle hour of all the short-term TAFs
found in that file. (See the TAF Cycle discussion below.)
All forecasts received are placed in
these files as they are received. The files are updated approximately every
five minutes as data becomes available. Forecasts may be duplicated within the
files and multiple forecasts received from a station may appear in a
Cycle files are deleted before the
start of cycle, e.g., the file 18Z.TXT will be deleted at approximately 1710Z
in preparation for receipt of new data. This means that data up to 23 hours old
Each cycle file contains multiple reports in the following format:
observation time is
the extrapolated time of the observation in the form
report is the TAF observation spanning one or more lines.
of the report is delimited by a blank line.
If an amendment is received from a
station, the amendment is
appended to the original forecast following the
indicator "Amendment -" on a line by itself.
Data files are available for the past 4
observing cycles and are identified by cycle.
The current time is
the TAF observing cycle is
The current cycle file may be unavailable
or incomplete until the end of the cycle.
A Discussion of TAF Cycles
In the U.S., TAFs are produced four
times a day starting at approximately 30 minutes before each main synoptic hour
(00Z, 06Z, 12Z, and 18Z). All the forecasts produced starting one hour before
the main synoptic hour up to four hours past the main synoptic hour are
considered to be for the same cycle. For example, forecasts produced between
1100Z and 1600Z are all considered to be 12Z forecastss. In reality, forecasts
contain the starting and ending times for which the forecast is valid. Our rule
of thumb is that all forecasts produced between (hh-1)00Z to
(hh+4)44Z are considered to be for the hh cycle. The following
table summarizes the relationship between forecast production time and
Please note that outside of the
U.S., TAF forecasts may be produced on different schedules. For our purposes,
we include non-U.S. forecasts within the same file structure.