251500Z POSITION NEAR 26.8S 78.3E. TROPICAL CYCLONE 08S (CORENTIN), LOCATED APPROXIMATELY 1239 NM SOUTH-SOUTHEAST OF DIEGO GARCIA, HAS TRACKED EAST-NORTHEASTWARD AT 04 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND UPPER-LEVEL ANALYSIS INDICATE A FULLY EXPOSED, INCREASINGLY DISORGANIZED LOW LEVEL CIRCULATION CENTER (LLCC) UNDER HIGH (20 TO 25 KNOTS) VERTICAL WIND SHEAR (VWS). A 251115Z SSMIS 91 GHZ MICROWAVE IMAGE SHOWS LIMITED, SHALLOW CONVECTIVE BANDING WRAPPING AROUND THE ELONGATED LLCC. GIVEN THIS DISORGANIZED STRUCTURE, THERE IS MODERATE TO LOW CONFIDENCE TO THE INITIAL POSITION. FIXING AGENCIES ARE NO LONGER REPORTING SUBJECTIVE DVORAK INTENSITY VALUES DUE THE DETERIORATING STRUCTURE OF THE CYCLONE. HOWEVER, A PREVIOUS 250403Z PARTIAL METOP-B ASCAT IMAGE SHOWS 40 TO 45 KNOT WINDS, SUPPORTING THE INITIAL INTENSITY OF 40 KNOTS. VARIOUS OBSERVATIONAL DATA INDICATE THAT TC CORENTIN IS BECOMING SUBTROPICAL, INCLUDING THE PRESENCE OF AN UPPER-LEVEL TROUGH OVER THE LLCC AND A DECREASING CORE TEMPERATURE ANOMALY. MULTI-MODEL GUIDANCE SHOWS THE CYCLONE MOVING SLOWLY NORTH OVER THE NEXT 12 HOURS AS IT COMPLETES SUBTROPICAL TRANSITION. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 251200Z IS 16 FEET.
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