Hurricane forecasts with Regional NMMB: Impact of HWRF Physics Weiguo Wang and Vijay Tallapragada EMC/NCEP/NOAA, College Park, MD 20740 TCRF/69th IHC Mar.

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Hurricane forecasts with Regional NMMB: Impact of HWRF Physics Weiguo Wang and Vijay Tallapragada EMC/NCEP/NOAA, College Park, MD TCRF/69th IHC Mar HIWPP Project Co-Lead: S.G. Gopalakrishnan, AOML/HRD 1

 HWRF physics packages into NMMB  Hurricane simulations with regional NMMB + NMMB with ‘NAM physics’ vs with ‘HWRF physics’ + NMMB with ‘HWRF phys’ vs operational HWRF  Issues and plans  Summary and Future work 2 Outline

HWRF physics into NMMB Following physics schemes used in operational HWRF have been added to NMMB: 1.GFSPBL scheme 2.GFDL surface layer plus GFDL land surface scheme 3.SAS scheme 4.MESO-SAS scheme 5.Add empirical z 0 for hurricane to MYJ surface scheme NMMB has “fer”, “fer_high” micophysics schemes, and “gfdl”, “rrtmg” for radiation; those are very similar to HWRF’s. 3

Operational HWRF vortex Initial conditions GFS 0.5-degree data Boundary Conditions NPS NMMB configure_file_d01 configure_file_d02 configure_file_d03 namelist.nps Post/Tracker Analysis/plots To be replaced by spectral data To be replaced by NMMB-DA/INIT NMMB-hurricane flowchart 4

NMMB Hurricane simulations domains, 43-level, feedback=0.5 No ocean, no DA 5 Phys OptionsConfiguration 01 NAM-like phys Configuration 02 hwrfphys Configuration 03 Hwrfphys-noah Turbulence/pbl:MYJGFSHURGFSPBL sfc_layer:MYJGFDLMYJ (z0 modification) land_surface:NOAHGFDLSLABNOAH convection:BMJSASHUR microphysics:FER shortwave:GFDL longwave:GFDL

ARTHUR simulated by regional NMMB with HWRF phys: cycle

HWRF phys NAM phys 7 NMMB Track and intensity Hwrfphys vs Nam-like phys Convection or/and surface layer (z0) schemes in NAM phys may explain its weaker intensity

Wind Structure at 36 hr, near landing 10m wind E-W cross section NAM physHWRF phys 8

Compare NMMB using HWRF phys with Operational HWRF NMMB (red) Intensity very close to HWRF (purple), and even better timing of max 9

Other physics options: GFSPBL-MYJ-noahLSM (modified z0 over sea in MYJ sfc) 10 Operational HWRF NMMB-hwrfphys NMMB-hwrfphys-NOAH

11 Issues: Some issues for NMMB-hurricane still need to be addressed, for example, nest motion Nests do not move with vortex Bad track

12 Plans: TaskStatusnote Transition of HWRF physics suite to NMMB DONE Already In nems trunk Need extensive tests HWRF nest motion algorithm to NMMB ONGOING HWRF vortex initialization to NMMB ONGOING We have old version working HWRF data assimilation Planned GSI-EnKF ? Ocean coupling Planned Use nems coupler if OK Add coupler for moving nests Post processing Planned Add in-model diagnostic fields; OK to use ncep-post Ongoing NMMB-hurricane tasks

13 Plans: NMMB-hurricane Coupled with many other components NMMB-hurricane in NEMS

Summary 14 With HWRF phys package, regional NMMB can well simulate hurricane structure, intensity and track, showing potential to further advance NCEP capability to hurricane forecast. Comparison with physics options in NAM shows importance of using good physics parameterizations for hurricanes. Future work: improve nest motion algorithm, other components (e.g., DA + init) from HWRF system, …, work with other components under nems