GRIB precip accumulation

From: Richard Carpenter (rcarpenter@XXXXXX)
Date: Wed Oct 10 2001 - 10:46:36 MDT


Hello,

I'm trying to read precip accumulation from a GRIB file. In the case where
there are variables for multiple accumulation periods in the file, NCL uses
only one of the variables. The NCL GRIB variable naming convention does not
appear to handle the length of the accumulation.
As an example, the output of "wgrib" shows that there are two accumulation
periods available: 12-24 hr and 21-24 hr.

441:11022150:d=01101000:APCP:kpds5=61:kpds6=1:kpds7=0:TR=4:P1=12:P2=24:TimeU
=1:sfc:12-24hr acc:NAve=0
554:13830914:d=01101000:APCP:kpds5=61:kpds6=1:kpds7=0:TR=4:P1=21:P2=24:TimeU
=1:sfc:21-24hr acc:NAve=0

NCL makes only one of these available, however:

Variable: A_PCP_212_SFC_acc (file variable)
Type: float
Total Size: 95460 bytes
            23865 values
Number of Dimensions: 2
Dimensions and sizes: [gridx_212 | 129] x [gridy_212 | 185]
Coordinates:
Number Of Attributes: 10
  center : US Weather Service - National Met. Center
  long_name : Total precipitation
  units : kg/m^2
  _FillValue : -999
  level_indicator : 1
  grid_number : 212
  parameter_number : 61
  model : ETA Model - 40 km version
  forecast_time : 24
  initial_time : 10/10/2001 (00:00)

Any help would be appreciated. Thank you.

Richard Carpenter



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