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DefinitionVertical integral from the ground to the nominal top of the atmosphere expressing the total amount of water (vapour + cloud water + cloud ice), but no precipitation included.
ValidityDaily meanaveraged
Comment Computed from instantaneous values at 00, 06, 12 and 18Z
GRIB 2
Parameter
Discipline= 0  Meteorological products 
Parameter Category= 1  Moisture
Parameter Number= 51
   Total column water (Vertically integrated total water (vapour + cloud water/ice)
All 1'sScaled value of first All 1's All 's
Level
Type of first fixed surface= 1Ground or water surface
Scale factor of first Type of second fixed surface= 8all bits to 1Missing
Scaled value Scale factor of first fixed surface= All 1'sScale factor all bits to 1Missing
Type of second fixed surface= 8
 Nominal top of the atmosphere
Scale factor of second fixed surface= all bits to 1Missing
Scaled value of second fixed surface= all bits to 1
GRIB 2 and C-code for: Perturbed forecast, Control forecast, Perturbed re-forecast and Control re-forecast

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