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The 6-hour cycling GDAS, Gridded Statistical Interpolation (GSI) analysis is posted at 1x1 degree global records 4X/day is the output of the GSI analysis using the NCEP collection of conventional and non-conventional observations, tropical cyclone relocation, QC, etc ...

GSI home page information: http://www.emc.ncep.noaa.gov/gmb/gdas/



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