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).