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The Aviation Digital Data Service (ADDS) makes available
to the aviation community text, digital and graphical
forecasts, analyses, and observations of aviation-related
weather variables. ADDS is a joint effort of NCAR Research Applications
Program (RAP),
Global Systems Division
(GSD) of NOAA's Earth
System Research Laboratory (ESRL),
and the National Centers for Environmental Prediction
(NCEP) Aviation Weather Center
(AWC).
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weather.gov 
