|North American Mesoscale (NAM) System
||NAM V4 upgrade : Alaska/CONUS nests move to 3 km resolution;
analysis/physics changes. 12-h NDAS w/3-h analysis updatse for the 12 km parent
domain replaced with a 6-h spin-up cycle with hourly analysis updates for the 12 km
parent domain and 3 km CONUS/Alaska nests.