grib data with multiple time axis

Hi All,
I have a grib file with the following attributes. NCL sees it as two time
coordinates with lengths 2 and 3, while conversion to netcdf using cdo
produces a single time axis of length 5. It looks like NCL collects the 2
months with 30 days as one coordinate and the remaining 3 months with 31
days as another.

This makes me wonder why there is such difference and which way of reading
is likely to give me the right answer. Any suggestions on how to read the
data as one single time coordinate are most welcome.

Cheers,
Prince

Variable: f
Type: file
filename: cc_199606_199607_199611_run01
path: cc_199606_199607_199611_run01.grb1
   file global attributes:
   dimensions:
      forecast_time0 = 2
      g0_lat_1 = 73
      g0_lon_2 = 144
      forecast_time3 = 3
   variables:
      float V_GRD_GDS0_SFC_ave30d ( forecast_time0, g0_lat_1, g0_lon_2 )
         center : xx
         long_name : v-component of wind
         units : m/s
         _FillValue : 1e+20
         level_indicator : 1
         gds_grid_type : 0
         parameter_table_version : 1
         parameter_number : 34
         initial_time : 05/25/1996 (00:00)

      float V_GRD_GDS0_SFC_ave31d ( forecast_time3, g0_lat_1, g0_lon_2 )
         center : xx
         long_name : v-component of wind
         units : m/s
         _FillValue : 1e+20
         level_indicator : 1
         gds_grid_type : 0
         parameter_table_version : 1
         parameter_number : 34
         initial_time : 05/25/1996 (00:00)

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Received on Mon Jul 15 00:21:35 2013