ZCZC 000 NOXX02 LSSW 100400 METNO C4615 NOTIFICATION FROM ECMWF ECMWF IS AUGMENTING THE TROPICAL CYCLONE (TC) TRACK PRODUCTS THAT IT MAKES AVAILABLE ON THE GTS. THIS PRODUCT NOW INCLUDES TRACKS OF TROPICAL CYCLONES THAT DEVELOP (I.E. UNDERGO GENESIS) DURING THE FORECAST INTEGRATIONS (THE 'GENESIS CATEGORY'), AS A SUPPLEMENT TO THE TRACKS THAT THEY ALREADY PROVIDE FOR EXISTING TROPICAL CYCLONES, I.E. WHERE THERE IS AN OFFICIAL OBSERVATION TC REPORT AT THE INITIAL TIME OF THE FORECAST TIME (THE 'PRE-EXISTING CATEGORY'). THE TRACK PRODUCTS ARE PROVIDED FOR BOTH HIGH-RESOLUTION (HRES) AND ENSEMBLE (ENS) FORECASTS OUT TO 10 DAYS. THERE WILL BE NO CHANGE TO THE BUFR ENCODING OF THESE PRODUCTS, AND THE GTS HEADERS WILL NOT CHANGE (SEE DESCRIPTION BELOW): TT = JS INDICATES: BUFR, SURFACE/SEA LEVEL A1 = X INDICATES: OTHER SURFACE DATA A2 = X INDICATES: GLOBAL AREA (NOT DEFINED) II = 01 TO 19 INDICATES: SEQUENCE NUMBER OF TC TRACK BULLETIN CCCC = ECMF INDICATES: HRES FORECASTS CCCC = ECEP INDICATES: ENS FORECASTS YY = INDICATES: THE DAY OF THE MONTH 280 AA 05/11/2015 7 TOKYO ANTARCTIC 2 - IN REGION II: SEOUL 05/11/2015 E SMAA01 RKSL FM 12-IX SYNOP 00, 06, 12, 18 89859 ANTARCTIC JANG BOGO STATION NNNN