Looking at the index files in
https://ftp.ncep.noaa.gov/data/nccf/com/gfs/prod/, there's no probability of precipitation (POP) data provided. (There is a probability of frozen precipitation.)
Is there a way to derive a POP (using the NWS 0.01 inch standard, or some other standard) from the other values provided like the precipitation rate (PRATE) value?
The model output statistics in the GFS data provides POP values for a number of domestic airports, but I'm interested in worldwide, hourly POP.