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 Multi-Ensemble_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 Multi-Ensemble mean 6-hour QPF at that projection time is divided by the Multi-Ensemble mean 48-hour QPF. Then that quotient is multiplied by the WPC 48-hour QPF.
If Multi-Ensemble_48-hr QPF > 0, then (Multi-Ensemble_6-hr QPF / Multi-Ensemble_48-hr QPF) x WPC 48-hour QPF
GIF images are then made from the post processed grid data.
The change to using the Mulit-Ensemble Mean (GEFS+ECENS+CMCE) was made on July 28, 2015.