https://www.wpc.ncep.noaa.gov/grib/hpcgrib.shtml https://www.wpc.ncep.noaa.gov/grib/hpcgrib.shtml > The WPC makes available its Day 1-3 6-hourly QPF files in G

https://www.wpc.ncep.noaa.gov/grib/hpcgrib.shtml https://www.wpc.ncep.noaa.gov/grib/hpcgrib.shtml > The WPC makes available its Day 1-3 6-hourly QPF files in GRIB 1 format at 32km resolution. The GRIB files are available for download via the NCEP anonymous FTP server (ftp.hpc.ncep.noaa.gov) Et c., there's more. I think that's forecast data. Also: https://psl.noaa.gov/data/gridded/ https://psl.noaa.gov/data/gridded/ And so on. Throw "grib" (a data format they use a ton) on a search and you'll start finding pages like this. Took about a minute to find this stuff.