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The first 15 Range Reference Atmospheres (RRA) listed were generated by the NASA Marshall Spaceflight Center (MSFC) with
the coordination of the Range Commanders Council Meteorology Group beginning in 2013, as indicated by the file naming convention.
They include the actual data in an Excel .xlsx file, an inventory text file detailing the period of record (POR) and a PDF report file.
Data is produced for individual months and for the entire year grouped together (month 13). An Excel .xls file containing all
15 RRAs plus 2 data tools is also provided. Macros must be enabled to use the tools.
RRAs with the # symbol were generated by the 14th Weather Squadron (14WS) in Sep 2006.
Generally speaking, the POR for both the 2006 and 2013 cycles begins in approximately 1990.
This POR was selected as detailed analysis of sample RRAs with longer PORs during the 2006 cycle indicated the potential
of questionable data in the late 1970s and the 1980s.
MSFC employed an automated quality control process and a manual process for suspect files.
There is currently no plan to create RRA products for other sites. The next projected refresh cycle is 2018.
Only files from the 2006 cycle that were not created in the 2013 cycle have been retained.
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