000 WTPZ43 KNHC 071444 TCDEP3 HURRICANE FELICIA DISCUSSION NUMBER 16 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP082009 800 AM PDT FRI AUG 07 2009 FELICIA CONTINUES TO WEAKEN WITH A SHRINKING CENTRAL DENSE OVERCAST AND A LESS DISTINCT EYE ON SATELLITE PICTURES. THERE IS ALSO SOME SUGGESTION ON NIGHT VISIBLE IMAGES THAT THE MID-LEVEL CENTER MAY BE BECOMING SOMEWHAT DISPLACED FROM THE LOW-LEVEL CIRCULATION. A BLEND OF THE DVORAK T AND CI NUMBERS FROM SAB/TAFB GIVE AN INITIAL INTENSITY OF ABOUT 85 KT FOR THIS ADVISORY. STEADY WEAKENING IS LIKELY AS THE CYCLONE TRAVERSES COOL WATERS FOR THE NEXT COUPLE OF DAYS...THOUGH THE SHEAR IS EXPECTED TO REMAIN LOW. IN ABOUT 48 HOURS...WATER TEMPERATURES START TO SLOWLY RISE...BUT VERTICAL WIND SHEAR IS EXPECTED TO BECOME MODERATE FROM THE WEST. THE MODELS RESPOND TO THESE CHANGES A LITTLE DIFFERENTLY...WITH THE STATISTICAL GUIDANCE SHOWING FELICIA WEAKENING FASTER THAN THE DYNAMICAL GUIDANCE. THE NHC FORECAST IS CLOSE TO THE PREVIOUS ONE...GENERALLY A LITTLE ABOVE THE MODEL CONSENSUS...AND SHOWS FELICIA WEAKENING TO A TROPICAL DEPRESSION AS IT APPROACHES HAWAII. THE INITIAL MOTION HAS TURNED A LITTLE BIT TO THE LEFT AND ACCELERATED...NOW 295/11. THIS IS PROBABLY THE BEGINNING OF THE WELL-ADVERTISED GRADUAL TURN TO THE WEST DUE TO SUBTROPICAL RIDGING BUILDING TO THE NORTH OF THE HURRICANE. GLOBAL MODELS ARE IN GOOD AGREEMENT ON THIS TURN AND LITTLE CHANGE HAS BEEN MADE TO THE EARLY PART OF THE OFFICIAL FORECAST. IN A COUPLE OF DAYS...THE STEERING PATTERN BECOMES MORE COMPLEX WITH A SECOND MID-LEVEL RIDGE FORECAST TO BUILD NEAR HAWAII AND A WEAKNESS IN THE RIDGE TO THE NORTHEAST. IF THE CYCLONE HAS GAINED ENOUGH LATITUDE...IT IS POSSIBLE THAT THIS WEAKNESS COULD CAUSE FELICIA TO TURN MORE TO THE WEST- NORTHWEST...A TRACK FAVORED BY THE ECMWF/NOGAPS/GFS MODELS. HOWEVER...ANOTHER SET OF MODELS...COMPRISED OF THE GFDL/HWRF/UKMET/GFDN...SUGGEST THAT THE SYSTEM WILL CONTINUE MOVING TOWARD THE WEST OR WEST-SOUTHWEST AFTER BYPASSING THE WEAKNESS IN THE RIDGE. SINCE FELICIA IS LIKELY TO BE WEAK AND STEERED MORE BY THE LOWER-LEVEL TRADES...THE OFFICIAL FORECAST WILL LEAN TOWARD THE SECOND SCENARIO AT THIS POINT. DATA FROM A G-IV AIRCRAFT MISSION TO THE NORTH AND NORTHWEST OF THE HURRICANE THIS MORNING SHOULD BE ASSIMILATED INTO THE 1200 UTC GLOBAL MODEL GUIDANCE...AND HOPEFULLY WILL BRING THOSE MODELS INTO BETTER AGREEMENT IN THE LONGER-TERM. FORECAST POSITIONS AND MAX WINDS INITIAL 07/1500Z 17.9N 135.6W 85 KT 12HR VT 08/0000Z 18.6N 137.2W 75 KT 24HR VT 08/1200Z 19.2N 139.4W 65 KT 36HR VT 09/0000Z 19.5N 141.9W 55 KT 48HR VT 09/1200Z 19.6N 144.5W 45 KT 72HR VT 10/1200Z 19.5N 150.0W 35 KT 96HR VT 11/1200Z 19.3N 155.5W 25 KT...INLAND 120HR VT 12/1200Z 19.0N 160.5W 20 KT...REMNANT LOW $$ FORECASTER BLAKE