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Anatomy of NCEP EMC VSDB Database 
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Fanglin Yang, NWS/NOAA/NCEP/EMC


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For Scalar variable, for instance
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V01 GFS 36 2016011400 GFS G2/NHX SAL1L2 T P850 =   3600.   0.176434607E+01   0.180782900E+01   0.251668589E+02   0.252372094E+02   0.261536586E+02
 
V01 -- version 1. No real meaning
GFS -- forecast model
36  -- forecast hour, 
2016011400 --  verification/validation time, 
GFS -- analysis 
G2/NHX  -- 2.5-deg grid over Northern Hemisphere 
SAL1L2  -- scalar variable
T -- Temperature
P850 -- 850 hPa
3600 -- number of points
0.176434607E+01 -- forecasts mean (f) 
0.180782900E+01 -- analysis mean  (a)
0.251668589E+02  -- forecast*analysis f*a
0.252372094E+02 -- forecast^2 (f*f)
0.261536586E+02 -- analysis^2 (a*a)

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For  Vector Wind, for instance
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V01 GFS 360 2014112800 GFS G2/PNA VAL1L2 WIND P250 =   1311.   0.361918573E+00   0.451824065E+00   0.974048979E+00   0.281390634E+01  -0.344594241E+02   0.429293185E+03   0.536060212E+03

.......
WIND -- vector wind
P250 -- 250 hPa
1311 -- number of points
0.361918573E+00 -- uf, forecat zonal wind
0.451824065E+00 -- vf, forecast meridional wind
0.974048979E+00 -- ua, analysis zonal wind
0.281390634E+01 -- va analysis meridional wind
-0.344594241E+02 --(uf*ua + vf*va )
0.429293185E+03 -- (uf*uf + vf*vf)
0.536060212E+03 -- (*ua*ua + va*va)