Here’s a link to a limited amount of experimental output… https://rapidrefresh.noaa.gov/hrrr/HRRR/Welcome.cgi?dsKey=rrfs_na_3km_dev1_conus_jet&domain=full%3Ahrrr&run_time=10+Jan+2024+-+00Z Latest update that I saw was that after several delays, implementation was planned for end of 2024. The FV3 will also be part of things. Here’s a link the the experimental output from it… https://fim.noaa.gov/FV3new/ The whole system will eventually replace the HRRR, RAP, Hi-Res Window, and NAM’s. .