| ADDS - Turbulence Help
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Back to Turbulence Page
or Turbulence help
Disclaimer and Labeling
The Aviation Digital Data Service is operationally supported 24 hours
a day, 7 days a week by the National Weather Service’s Aviation
Weather Center. Its use is unrestricted (meteorologists, dispatchers,
GA and commercial pilots, ATC, etc.) as a supplementary source of
The Turbulence Page contains 5 sections.
- The top section contains depictions of the Graphical Turbulence
Guidance product, version 2 (GTG-2.5), which forecasts mid-level and
upper-level clear air turbulence (CAT) from 10,000 feet to FL 450,
with 0, 1, 2, 3, 6, 9, and 12 hour lead-times.
It does not provide turbulence analyses or forecasts below 10,000 ft MSL.
GTG-2.5 is a Supplementary Weather Product. A Supplementary Weather
Product is an aviation weather product that may be used for enhanced
situational awareness. If utilized, a supplementary weather product
must only be used in conjunction with one or more primary
weather product (AIM 7-1-3).
- The second section contains a link to the Flight Path Tool, an
interactive java tool which also contains the Graphical Turbulence
Guidance product in a different display. Some options on the flight
path tool include: overlaying other weather information, zooming to a
specific geographic region, viewing a vertical cross section along a
selected route of flight, and viewing GTG-2 information in 1000 ft
intervals. However, images of turbulence below 10,000 ft MSL are not
- The next section on the left, "Current Turbulence Advisories," is
a graphical representation (which can be enlarged) of text AIRMETs
which depicts the location of turbulence AIRMETs with solid green
lines and turbulence SIGMETs with solid red lines. AIRMETs and
SIGMETs are Primary Weather Products. A Primary Weather Product is an
aviation weather product that meets all the regulatory requirements
and safety needs for use in making flight related, aviation weather
decisions (AIM 7-1-3).
- The next section on the right, Pilot Reports of Turbulence, is an
image map containing links to regional GIF images depicting pilot reports.
The images are re-created about every 15 minutes and depict location and
severity of turbulence reported by pilots
One of seven different regions or the contiguous U.S. may be chosen.
PIREPs are Primary Weather Products. PIREPs do not include automated
in situ reports.
- The last section contains a link to the In-Situ Turbulence
viewer, which is an experimental product with restricted access. More
information about the viewer and how to obtain access are available
by following the link.
This Qualified Internet
Communication Provider's (QICP) servers and communication interfaces are
approved by the FAA as secure, reliable, and accessible in accordance
with AC 00-62.
1) This QICP does not ensure the quality and
currency of the information transmitted to you.
2) The user assumes the entire risk related to
the information and its use.