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| #112528 (Received by flhurricane at: 8:40 AM 23.Sep.2006) TCDAT3 HURRICANE HELENE SPECIAL DISCUSSION NUMBER 45 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL082006 800 AM EDT SAT SEP 23 2006 THIS SPECIAL ADVISORY IS BEING ISSUED TO UPDATE THE INITIAL AND FORECAST INTENSITY AND WIND RADII FOR HELENE. THE TRACK FORECAST IS UNCHANGED FROM THE PREVIOUS ADVISORY. A RECENT QUIKSCAT PASS INDICATES THAT HELENE CONTAINS A LARGE AREA OF HURRICANE FORCE WINDS SOUTHWEST OF THE CENTER. THE ADVISORY INTENSITY OF 80 KT IS BASED ON THE STRONGEST WIND IN THE QUIKSCAT DATA...WHICH WAS OUTSIDE OF DEEP CONVECTION IN THE SOUTHWEST QUADRANT. THE WIND RADII HAVE BEEN EXPANDED ALSO BASED ON THE QUIKSCAT DATA. EVEN THOUGH HELENE HAS STRENGTHENED...IT CONTINUES TO LOSE TROPICAL CHARACTERISTICS AND IS EXPECTED TO TRANSFORM INTO AN EXTRATROPICAL CYCLONE LATER TODAY. FORECAST POSITIONS AND MAX WINDS INITIAL 23/1200Z 37.4N 47.2W 80 KT 12HR VT 23/1800Z 38.2N 44.8W 75 KT...EXTRATROPICAL 24HR VT 24/0600Z 39.7N 40.3W 70 KT...EXTRATROPICAL 36HR VT 24/1800Z 41.5N 35.8W 65 KT...EXTRATROPICAL 48HR VT 25/0600Z 43.3N 31.7W 60 KT...EXTRATROPICAL 72HR VT 26/0600Z 46.8N 23.9W 55 KT...EXTRATROPICAL 96HR VT 27/0600Z 50.4N 16.5W 45 KT...EXTRATROPICAL 120HR VT 28/0600Z 55.0N 10.0W 40 KT...EXTRATROPICAL $$ FORECASTER RHOME/KNABB |
