Upcoming Mesoscale Branch Implementations


If the link is active, click on model to see more information on recent or upcoming implementations.
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Model

What

When

North American Mesoscale (NAM) System Use of hybrid-variational-ensemble GSI analysis with global EnKF; modified gravity-wave drag/mountain blocking; new version of BMJ convection with less convective triggering; replace GFDL radiation with RRTM, new version of microphysics (Ferrier-Aligo); explicit convection in all NAM nests except Alaska Summer 2014
High-Resolution Rapid Refresh (HRRR) Initial implementation of HRRR at NCEP Fall 2014
Short-range Ensemble Forecast (SREF) system Drop WRF-NMM members; increase total membership to 26 (13 NEMS-NMMB, 13 WRF-ARW); increase from 35 to 41 vertical levels; more physics diversity and stochastic physics parameters; use bred vectors and global EnKF to perturb initial conditions Winter-Spring 2015
RTMA/URMA system Source of background changed from 13 km RAP only to a blend of the 3 km HRRR and 4 km NAM CONUS nest (still use RAP in regions outside of HRRR/NAM nest); add variational QC and terrain-aware gross error check; wind downscaling enhancements; westward extension of the 2.5 km CONUS grid; 7 day expansion of look-back period for URMA precipitation analysis Two phases : Fall 2014 (background and URMA precip analysis changes); Spring/Summer 2015 (all others)