For grid points equal to zero, the WPC 48-hour QPF is multiplied by 1/8 (0.125) to get a 6-h accumulation for each projection time written out to the post-processed grid file.
If GEFS_48-hr QPF = 0, then WPC_48-hr x 0.125
For grid points where the ensemble mean 48-h QPF is greater than zero, the GEFS 6-hour QPF at that projection time is divided by the GEFS 48-hour QPF. Then that quotient is multiplied by the WPC 48-hour QPF.
If GEFS_48-hr QPF > 0, then (GEFS_6-hr QPF / GEFS_48-hr QPF) x WPC 48-hour QPF
GIF images are then made from the post processed grid data.
At this time we are using the GEFS MEAN, but we may incorporate ensemble QPF from the CMC MEAN and ECMWF MEAN in the near future.