270900Z POSITION NEAR 15.4S 97.1E. TROPICAL CYCLONE (TC) 12S (CALEB), LOCATED APPROXIMATELY 200 NM SOUTH OF COCOS ISLAND, HAS TRACKED WESTWARD AT 06 KNOTS OVER THE PAST SIX HOURS. MULTISPECTRAL SATELLITE IMAGERY REVEALS A DECAYING, EXPOSED LOW-LEVEL CIRCULATION CENTER DEVOID OF ANY PERSISTENT CONVECTION, AND SUPPORTS THE INITIAL POSITION WITH HIGH CONFIDENCE. THE INITIAL INTENSITY OF 35 KNOTS IS SUPPORTED BY A PARTIAL 270328Z ASCAT PASS SHOWING 30 KNOT WINDS WITH ISOLATED 35 KNOT WINDS RELEGATED TO THE SOUTHERN PERIPHERY OF THE SYSTEM. ENVIRONMENTAL CONDITIONS ARE NO LONGER CONDUCIVE FOR DEVELOPMENT, AND FULL DISSIPATION OF TC CALEB SYSTEM IS EXPECTED WITHIN THE NEXT 12 HOURS. 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 270600Z IS 12 FEET.