Description of NCEP's CFSV2 File Naming Convention

NCEP CFSV2 files archived in the RDA have names of the form cdas1.YYYYMMDD.XXXXX.tar^†, where:
XXXXX is a file type,
YYYY is the year,
MM is the month,
DD is the day
^†Prior to 2011 Apr 01, filenames have the same form as the files in the CFSR dataset. This is because 2011 Apr 01 is the date that the CFS model became operational at NCEP.

CFSV2 file types:

XXXXX	Levels	Product Type	Grid Resolution
ipvgrbanl	Isentropic	Analyses	1-degree
ipvgrbf	Isentropic	1- through 9-hour Forecasts	1-degree
ipvgrbh	Isentropic	1- through 9-hour Forecasts	0.5-degree
ipvgrbl	Isentropic levels	1- through 9-hour Forecasts	2.5-degree
ocngrbf	Ocean	1 hour Averages for hours 1 through 9	1-degree
ocngrbh	Ocean	1 hour Averages for hours 1 through 9	0.5-degree
ocngrbl	Ocean	1 hour Averages for hours 1 through 9	2.5-degree
pgrbanl	Atmospheric Pressure	Analyses	1-degree
pgrbf	Atmospheric Pressure, Surface and Flux Fields	1- through 9-hour Forecasts	1-degree
pgrbh	Atmospheric Pressure, Surface* and Flux* Fields	Analyses and 1- through 9-hour Forecasts	0.5-degree
pgrbl	Atmospheric Pressure, Surface and Flux Fields	1- through 9-hour Forecasts	2.5-degree
sfluxgrbf	Surface and Flux Fields	1 through 9 hours	0.2-degree
sfluxgrbl	Surface and Flux Fields	1 through 9 hours	1.9-degree
splgrbanl	Selected Surface/Near-Surface Parameters	Analyses	0.2-degree
splgrbf	Selected Surface/Near-Surface Parameters	6-hour Forecasts	0.2-degree
splgrbl	Selected Surface/Near-Surface Parameters	Analyses and 6-hour Forecasts	1.9-degree

* Parameters not analyzed by CFS will only be available as forecasts

Inside of each tar file will be the model output files from the individual CFSV2 model initializations (the model is initialized four times per day). The file names will have the form cdas1.tHHz.XXXXXFF.grib2, where:
XXXXX is a file type (see above),
HH is the initialization time (00, 06, 12, or 18 UTC),
FF is the forecast hour (the time at which the data are valid)

Forecast hours*:

FF	Description
anl	Analysis
01-09	Number of hours after initialization time at which the data are valid

* For file types ipvgrbanl, pgrbanl, and splgrbanl, which already contain the forecast hour for analysis in the type, the forecast hour is NOT repeated in the file name