ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM HURRICANE EUGENE DISCUSSION NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL EP052011 800 PM PDT THU AUG 04 2011 EUGENE HAS RAPIDLY WEAKENED DURING THE PAST SEVERAL HOURS AS THE STRUCTURE OF THE EYE HAS SIGNIFICANTLY DECAYED. AT 0000 UTC... DVORAK SATELLITE ESTIMATES WERE BETWEEN 77 AND 83 KT...AND WITH THE RECENT COMPLETE LOSS OF ANY EYE FEATURE...THE CURRENT INTENSITY IS SET TO 75 KT. STEADY TO RAPID WEAKENING SEEMS LIKELY AS THE CYCLONE MOVES OVER PROGRESSIVELY COOLER WATERS AND INTO A DRY STABLE ENVIRONMENT. MOST OF THE MODELS NOW SHOW A FASTER DECLINE IN WINDS...AND THE NHC INTENSITY FORECAST IS A BIT LOWER THAN THE LAST ADVISORY. REMNANT LOW STATUS IS ANTICIPATED WITHIN 3 DAYS DUE TO SSTS COOLING BELOW 23C. THE HURRICANE IS MOVING AT THE RATHER CLIMATOLOGICAL RATE OF 285/11. THIS GENERAL TRACK AND SPEED IS EXPECTED FOR THE NEXT COUPLE OF DAYS WITH THE SUBTROPICAL RIDGE HOLDING FIRM TO THE NORTH OF THE CYCLONE. AS THE CYCLONE BECOMES A SHALLOW SYSTEM...IT SHOULD TURN A BIT MORE TOWARD THE WEST AND SLOW DOWN IN THE TRADE WIND FLOW. THE NEW NHC FORECAST IS VERY CLOSE TO THE PREVIOUS FORECAST... REMAINING ON THE SOUTHERN EDGE OF THE GUIDANCE ENVELOPE. FORECAST POSITIONS AND MAX WINDS INIT 05/0300Z 17.4N 121.2W 75 KT 85 MPH 12H 05/1200Z 17.8N 123.0W 60 KT 70 MPH 24H 06/0000Z 18.4N 125.4W 50 KT 60 MPH 36H 06/1200Z 19.0N 127.6W 40 KT 45 MPH 48H 07/0000Z 19.6N 129.7W 30 KT 35 MPH 72H 08/0000Z 20.5N 133.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 09/0000Z 21.0N 136.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 10/0000Z...DISSIPATED $$ FORECASTER BLAKE NNNN
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