NCEP has recently upgraded the WRF-ARW/NMM Hires windows for the Eastern U.S. to a CONUS ARW and NMMB ~4km WRF runs. They are run at 00Z and 12z and produce hourly output out to 48 hours at roughly 5km.
We are in the process of making the necessary changes within our software and systems to accommodate the increase in files sizes and processing requirements to handle the larger domains. We should have these new data sets available and finalized later this week. Look for them where the old WRF-ARW/WRF-NMM EAST model pages were located.
Here is the NCEP technical bulletin describing all the changes to the model & physics in the upgrade.