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NWS Next Generation Air Transportation System (NextGen)

4-D Weather Single Authoritative Source


Proposed Definition of the 4-Dimensional Weather Single Authoritative Source

The Single Authoritative Source (SAS) is the subset of the NOAA NextGen Weather 4-D Data Cube (4-D Data Cube) that is the optimal representation of the current and future states of the atmosphere that provides a single answer for any aviation weather parameter and meets the spatial and temporal requirements, as specified by the civil Air Navigation Service Provider (ANSP), to support the ANSP's NextGen Air Traffic Management (ATM) decisions.

The 4-D Weather Single Authoritative Source (SAS):

  • Is only a portion of the 4-D Data Cube
  • Provides a common weather picture for National Air Space (NAS) participants (Airlines, DoD, FAA, etc.)
  • Is the basis for all aviation decisions by Air Traffic Management (ATM) in the FAA
  • Is formed by merger of model data, automated gridded algorithms, climatology and observational data, and meteorologist input/data manipulation to ensure consistency and accuracy


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