NHC/JHT Products in ATCF Buck Sampson (NRL, Monterey) and Ann Schrader (SAIC, Monterey) IHC 2007 Other Contributors: Chris Sisko, James Franklin, James.

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Presentation transcript:

NHC/JHT Products in ATCF Buck Sampson (NRL, Monterey) and Ann Schrader (SAIC, Monterey) IHC 2007 Other Contributors: Chris Sisko, James Franklin, James Gross and Colin Mcadie (NHC) John Knaff and Mark DeMaria (NOAA/NESDIS) Tim Marchok (GFDL) Ed Fukada (JTWC) NRL TC Page group

… and a workstation that packages results and code from multiple sources for use in the tropical cyclone forecast process at the centers (e.g., NHC or JTWC) ATCF is a Multi-Agency System ATCF NWP Models (FNMOC, NCEP) Consensus (NRL) Satellite Products (NRL/FNMOC) Intensity Models (NOAA/CIRA) TC Analyses (NOAA, CIMSS) Wind Radii (NOAA/CIRA) Trackers (JTWC) Bogus Advisories Statistics Tracks Fixes Obj Aids Navy Warnings Probabilities (NOAA/CIRA) Historical Data

Accomplishments 1. Evaluated wind radii CLIPERs 2. Implemented wind probabilities 3. Implemented GPCE 4. Improved satellite imagery overlay capability 5. Developed intensity and wind radii objective best track 6. Automated fix entry 7. Addressed NHC requirements

1. Wind Radii CLIPER Evaluation Results to be published in Wea. And Forecasting (Knaff, et al ) - MRCL superior mean average errors - DRCL superior with false alarm rates MRCL: 0-72 h, AL ONLYDRCL: h, AL, EP and WP

2. CIRA Wind Probabilities Single storm wind probabilities are computed immediately after advisory: 1) Available to forecasters as aid to set Watches and Warnings 2) Allows NHC to post probabilities as part of advisory package

3. Goerss Predicted Consensus Error (GPCE) GPCE is a forecast track uncertainty algorithm which has been implemented on ATCF. Forecast radii are saved for end of season evaluation. Evaluation software has been written, but is currently labor intensive and not driven through the ATCF interface. 70%

4. Automated Fix Ingest Subjective Dvorak, Objective Dvorak, SSMI, Quikscat SEAW, TRMM, Altimeter, AMSU, Radar, Doppler Radar, TRMM Radar, Synoptic Fix, Aircraft, Analysis, Dropsonde Fixes are now automatically ingested, error checked. Resulted in time saved. Auto Fix Ingest Types Manual entry takes time!

5. Improved Imagery Access Improvements for 2007 will include imagery retention on local system by storm id, improved access to imagery through dialogs. AMSU products were also added to suite.

6. Objective Best Track Objective best track routines can use either weighted mean or least squares fit. The weights are to be determined by the forecast agency (NHC or JTWC).

6. Objective Best Track Objective best track can be used for error checking and insuring fix data get into system. They can also provide a first guess for the forecaster. check data?

Accomplishments 1. Evaluated wind radii CLIPERs 2. Implemented wind probabilities 3. Implemented GPCE 4. Improved satellite imagery overlay capability 5. Developed intensity and wind radii objective best track 6. Automated fix entry 7. Addressed NHC requirements (~45) Two examples to follow …

New Wind Radii Forecast Graph Wind radii forecasting is tedious. This new dialog frees up time for meteorology.

New Wind Radii Forecast Graph Click on the graph to get new wind radii for each quadrant. Forecast period (12-72 h) and radius (34, 50, 64 kt) selectable at top click

(1055) (842) (659) (411) (319) Atlantic Intensity Consensus Skill Simple intensity consensus can be used as skill baseline for other techniques and as starting point for forecast. ( seasons)

(686) (501) (349) (209) (138) EP Intensity Consensus Skill Similar results for eastern North Pacific ( seasons)

Summary Seven JHT tasks addressed over two years –Much of JHT development also used at JTWC, CPHC Interagency cooperation has its benefits –Shared development costs –Shared data –Shared ideas Thanks to contributors –NHC, JTWC, CPHC, CIRA, JHT, JHT Participants,GFDL …