052100Z POSITION NEAR 18.6N 118.8E. TROPICAL DEPRESSION 04W (MAYSAK), LOCATED APPROXIMATELY 365 NM SOUTHEAST OF HONG KONG, HAS TRACKED WEST-NORTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED (EIR) SATELLITE IMAGERY REVEALS THAT THE BULK OF THE DEEP CONVECTION HAS WARMED AND SHEARED AWAY FROM THE LOW LEVEL CIRCULATION CENTER, WHICH HAS UNRAVELED OVER THE PAST 12 HOURS. RECENT MICROWAVE IMAGES STILL INDICATE A BROAD AREA OF CYCLONIC TURNING, BUT THERE IS NO DEFINED SYSTEM CENTER SINCE TD 04W REEMERGED IN THE SOUTH CHINA SEA. THE INITIAL POSITION AND INTENSITY IS BASED ON THE EIR ANIMATION AND POOR STRUCTURE ILLUSTRATED IN THE AFOREMENTIONED MICROWAVE IMAGES WITH LOW CONFIDENCE. UPPER-LEVEL ANALYSIS IS MARGINAL AS THE SYSTEM REMAINS IN AN AREA OF MODERATE (15 TO 20 KNOT) NORTHWESTERLY VERTICAL WIND SHEAR (VWS) AND WEAK RADIAL OUTFLOW. THE CYCLONE IS TRACKING ALONG THE SOUTHWESTERN PERIPHERY OF THE DEEP LAYERED SUBTROPICAL RIDGE (STR). 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 051800Z IS 10 FEET. REFER TO TROPICAL DEPRESSION 05W (HAISHEN) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.
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