Somehow the precip shield improves on the fv3 after being a good bit south of 12Z
http://mageval.ncep.noaa.gov/data/gfs/18/namer/850_temp_mslp_precip/gfs_namer_027_850_temp_mslp_precip.gif
qpf http://mageval.ncep.noaa.gov/data/gfs/18/namer/precip_p24/gfs_namer_036_precip_p24.gif