A JHT FUNDED PROJECT GFDL PERFORMANCE AND TRANSITION TO HWRF Morris Bender, Timothy Marchok (GFDL) Isaac Ginis, Biju Thomas (URI)

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Presentation transcript:

A JHT FUNDED PROJECT GFDL PERFORMANCE AND TRANSITION TO HWRF Morris Bender, Timothy Marchok (GFDL) Isaac Ginis, Biju Thomas (URI)

IMPROVED NWS MODEL GUIDANCE OVER THE PAST DECADE HAS RESULTED IN STEADY REDUCTION IN TRACK ERROR

SINCE MAJOR PHYSICS UPGRADES IN 2003 THE GFDL MODEL HAS PROVIDED THE MOST RELIABLE TRACK GUIDANCE IN BOTH BASINS

Upgrade with NCEP ’ S Ferrier Micro-physics Dissipative Heating Effect Added Improved Surface Momentum Fluxes Improved Ocean Initialization in the Gulf of Mexico (e.g., loop current, warm core rings) SUMMARY OF 2006 GFDL MODEL UPGRADES

2006 PHYSICS UPGRADES LEAD TO SIGNFICANTLY REDUCED INTENSITY ERRORS

Acceleration of Overall Trend Over the Past Six Years of Reduced GFDL Intensity Errors

COMPARISON BETWEEN GFDL AND PRELIMINARY VERSION OF HURRICANE WRF CASES SELECTED FROM 2004, 2005, AND 2006 ATLANTIC HURRICANE SEASONS.

Large Storm to Storm Variability in Track Performance

HWRF Tracks of Hurricanes Wilma and Ernesto Significantly Improved, Other 2004 and 2005 Storm Tracks Degraded at 120 Hours

EVALUATION OF UPGRADED HYBRID GFS MODEL

Major Upgrades to NCEP’s Global Forecast System (GFS) Scheduled for 2007 Replacement of Spectral Interpolation (SSI) Analysis System with Gridpoint Statistical Interpolation (GSI) Replacement of Sigma Vertical Coordinate System with Hybrid Sigma-Pressure System Use of Increased Observations Updated GFS Radiation Module NEW MODELING SYSTEM EXTENSIVELY TESTED ON 2005 & 2006 ATLANTIC AND EASTERN PACIFIC HURRICANE SEASONS. COMPARISONS MADE FOR BOTH GFDL AND GFS

Atlantic Season Average Track Error Using The Current Operational and New GFS GFDL GFS

120h Track Error Comparing GFDL and GFS Model With Current Operational GFS and New HYBRID GFS GFDL GFS

Much Improved Tracks of Ophelia OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3) OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3 OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3)

Degraded Philippe Track but Improved Intensity Forecast WINDSPEED HYBRID GFDL 84 HOURS OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3)

Early and Later Forecasts of Wilma Improved OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3) OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3) OLD GFDL (2) NEW GFDL (4) OLD GFS (1) NEW GFS (3)

Eastern Pacific Average Track Error GFDLGFS

New GFDL Had Significantly Reduced Track Errors Compared to New GFS in Both Basins ATLANTICEASTERN PACIFIC

Atlantic and Eastern Pacific Intensity Error for GFDL With Current Operational and Hybrid GFS EASTERN PACIFIC ATLANTIC

SUMMARY NEW PHYSICS UPGRADES TO GFDL MODEL IN 2006 LEAD TO MUCH IMPROVED INTENSITY FORECASTS. LATEST GFDL PHYSICS PACKAGES WERE SUCCESSFULLY TRANSFERRED TO HWRF. HWRF TRACK ERROR COMPARABLE TO GFDL AT 72H WITH SOME DEGRADATION IN LONGER TERM BUT HWRF MODEL DEVELOPMENT CONTINUING. NEW VERSION OF GFS HYBRID COORDINATE SYSTEM AND GSI IS LEADING TO IMPROVED TRACKS FOR BOTH THE GFS AND GFDL MODELS IN 3-5 DAYS IN THE ATLANTIC.

GFDL AND GFS TRACK COMPARISONS FOR ALL OF THESE CASES ARE AVAILABLE AT: ftp://ftp.gfdl.noaa.gov/pub/mb/hybrid/