Further Development of a Statistical Ensemble for Tropical Cyclone Intensity Prediction Kate D. Musgrave 1 Mark DeMaria 2 Brian D. McNoldy 3 Yi Jin 4 Michael.

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Further Development of a Statistical Ensemble for Tropical Cyclone Intensity Prediction Kate D. Musgrave 1 Mark DeMaria 2 Brian D. McNoldy 3 Yi Jin 4 Michael Fiorino 5 1 CIRA/Colorado State University, Fort Collins, CO 2 NOAA/NESDIS/StAR, Fort Collins, CO 3 University of Miami, Miami, FL 4 Naval Research Laboratory, Monterey, CA 5 NOAA/OAR/ESRL, Boulder, CO 67 th Interdepartmental Hurricane Conference – Tropical Cyclone Research Forum03/06/2013 S6-07

Motivation for Statistical Ensemble The Logistic Growth Equation Model (LGEM) and the Statistical Hurricane Intensity Prediction Scheme (SHIPS) model are two statistical-dynamical intensity guidance models SHIPS and LGEM are competitive with dynamical models Both SHIPS and LGEM use model fields from the Global Forecast System (GFS) to determine the large-scale environment Runs extremely fast (under 1 minute), using model fields from previous 6 hr run to produce ‘early’ guidance Atlantic Operational Intensity Model Errors JTWC experience with a similar statistical model shows improvements with multiple inputs We focus on using Decay-SHIPS (DSHP) and LGEM, initialized with model fields from GFS, the Hurricane Weather Research and Forecasting (HWRF) model, and the Geophysical Fluid Dynamics Laboratory (GFDL) model to create an ensemble 2

SPICE (Statistical Prediction of Intensity from a Consensus Ensemble) Model Configuration for Consensus SPICE forecasts TC intensity using a combination of parameters from: – Current TC intensity and trend – Current TC GOES IR – TC track and large-scale environment from GFS, GFDL, and HWRF models These parameters are used to run Decay-SHIPS and LGEM based off each dynamical model The forecasts are combined into two unweighted consensus forecasts, one each for DSHIPS and LGEM The two consensus are combined into the weighted SPC3 forecast 3

SPICE (Statistical Prediction of Intensity from a Consensus Ensemble) Model Configuration for Consensus DSHIPS and LGEM Weights for Consensus Weights determined empirically from Atlantic and East Pacific sample 4

SPICE Input – Model Diagnostic Files Simple ASCII file with SHIPS model predictors Input required – Model grib files u, v, T, RH, Z at mandatory levels 1000 to 100 hPa SST field if available – Model storm track (A-deck format) Output – ~20 kbyte ASCII file per 126 hr forecast Code available from CIRA – Currently used by: EMC; GFDL; NRL; ESRL; NCAR; SUNY-Albany; Uwisc Verification – HWRF and GFDL diagnostic files (against GFS analysis) 5 Sea surface temp (RSST) mb shear (SHDC); 200 mb zonal wind (U20C) 200 mb temp (T200); mb RH (RHLO) mb RH (RHMD); mb RH (RHHI) 200 mb divergence (D200); 850 mb vorticity (Z850) Key parameters are calculated in prescribed areas... This is already done with GFS output to create SHIPS “predictor” files available on NHC's FTP server

SPICE Input – Model Diagnostic Files … 6 Diagnostic files available from

Atlantic Retrospective Runs for HFIP Stream 1.5 Implementation 7

Results from 2012 Atlantic Season 8 SPICE LGEM DSHP Figure courtesy of James Franklin

Results from 2012 Atlantic Season 9 SPICE HWRF GFDL Figure courtesy of James Franklin

Results from 2012 Atlantic Season: Model Diagnostic Files 10

Updates and Testing for 2013 Season SPICE undergoing retrospective tests to run in HFIP Stream 1.5 for 2013 Season – consensus handling of members that drop out before 120 hr – assess weights assigned to SHIPS/LGEM Two additional versions are undergoing testing: – Regional ensemble: Combines additional regional models COAMPS-TC and AHW – Global ensemble: Includes HFIP global model ensembles HFIP retrospective testing is currently using operational parent model runs, retrospective parent model diagnostic files and tracks will be compared where available 11

Global Ensemble Preliminary Results 12 Shown here using 20-member experimental GFS ensemble

Summary SPICE model run for HFIP Stream 1.5 – For Retrospective Runs, 2011 Demonstration, and Retrospective Runs SPC3 showed skill improvements of up to 5-10% over SHIPS and LGEM – 2012 season showed mixed results, with SHIPS outperforming both LGEM and SPC3 at longer lead times Outlier analysis may lead to SPICE improvements for 2013 – Testing changes in statistical models, consensus design SPICE model should benefit from greater diversity of input models – Regional and global ensembles currently undergoing testing – Use model forecast intensity changes and diagnostic files to fit SHIPS coefficients for examination of model TC behavior in relation to environment 13