WTXS31 PGTW 310300 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE 05S (DARIAN) WARNING NR 028// RMKS/ 1. TROPICAL CYCLONE 05S (DARIAN) WARNING NR 028 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 310000Z --- NEAR 30.4S 68.2E MOVEMENT PAST SIX HOURS - 195 DEGREES AT 12 KTS POSITION ACCURATE TO WITHIN 045 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 140 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 085 NM NORTHWEST QUADRANT REPEAT POSIT: 30.4S 68.2E --- FORECASTS: 12 HRS, VALID AT: 311200Z --- 32.7S 68.3E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT 140 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT --- REMARKS: 310300Z POSITION NEAR 31.0S 68.2E. 31DEC22. TROPICAL CYCLONE (TC) 05S (DARIAN), LOCATED APPROXIMATELY 854 NM SOUTHEAST OF PORT LOUIS, MAURITIUS, HAS TRACKED SOUTH-SOUTHWESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS AN EXPOSED, BROAD LOW-LEVEL CIRCULATION WITH COLD-AIR STRATOCUMULUS WRAPPING INTO THE CENTER AND ISOLATED DEEP CONVECTION FLARING TO THE SOUTH-SOUTHEAST. A 310038Z SSMIS 91GHZ MICROWAVE IMAGE INDICATES SHALLOW BANDING WRAPPING TIGHTLY INTO A RAGGED CENTER WITH EXTENSIVE DRY AIR PRESENT OVER THE SYSTEM. RECENT WIND SPEED IMAGERY REVEALS AN ASYMMETRIC WIND FIELD WITH A WEAK FRONTAL STRUCTURE. A 301705Z ASCAT-B IMAGE SHOWED 40-45 KNOT WINDS OVER THE WESTERN PERIPHERY THUS THE INITIAL INTENSITY IS HELD CONSERVATIVELY AT 40 KNOTS. BASED ON THE AVAILABLE DATA, 05S IS CURRENTLY ASSESSED AS A SUBTROPICAL CYCLONE BUT IS EXPECTED TO TRANSITION INTO AN EXTRA- TROPICAL CYCLONE OVER THE NEXT 36 TO 48 HOURS AS IT ACCELERATES INTO THE MIDLATITUDE WESTERLIES. 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 310000Z IS 21 FEET.// NNNN