WTPN31 PGTW 050300    
1. TROPICAL STORM 31W (BEBINCA) WARNING NR 021    
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   050000Z5 --- NEAR 17.0N8 116.9E7
     MOVEMENT PAST SIX HOURS - 360 DEGREES AT 00 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   RADIUS OF 050 KT WINDS - 025 NM 
   RADIUS OF 035 KT WINDS - 070 NM NORTHEAST SEMICIRCLE  
                            060 NM ELSEWHERE
   REPEAT POSIT: 17.0N8 116.9E7
    ---
   FORECASTS:
   12 HRS, VALID AT:
   051200Z8 --- 17.5N3 116.6E4
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
   RADIUS OF 035 KT WINDS - 070 NM NORTHEAST SEMICIRCLE  
                            060 NM ELSEWHERE
   VECTOR TO 24 HR POSIT: 360 DEG/ 03 KTS
    ---
   24 HRS, VALID AT:
   060000Z6 --- 18.0N9 116.5E3
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 035 KT WINDS - 065 NM NORTHEAST SEMICIRCLE  
                            055 NM ELSEWHERE
   VECTOR TO 36 HR POSIT: 340 DEG/ 03 KTS
    ---
   36 HRS, VALID AT:
   061200Z9 --- 18.5N4 116.3E1
   MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 035 KT WINDS - 050 NM SOUTH QUADRANT        
                            060 NM ELSEWHERE
   VECTOR TO 48 HR POSIT: 300 DEG/ 03 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   070000Z7 --- 18.8N7 115.8E5
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 72 HR POSIT: 260 DEG/ 05 KTS
    ---
   72 HRS, VALID AT:
   080000Z8 --- 18.4N3 113.9E4
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
050300Z8 POSITION NEAR 17.1N9  116.8E6.
TROPICAL STORM (TS) 31W (BEBINCA), NOW LOCATED 200 WEST-NORTHWEST OF 
LINGAYEN, PHILIPPINES, HAS REMAINED QUASI-STATIONARY OVER THE PAST 
06 HOURS. THE WARNING POSITION IS BASED ON 042330Z2 VISIBLE AND 
INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON 
SATELLITE CURRENT INTENSITY ESTIMATES OF 55 KNOTS. ANIMATED 
SATELLITE IMAGERY CONTINUES TO INDICATE PULSING CONVECTION OVER THE 
LOW LEVEL CIRCULATION CENTER. A 042219Z8 MICROWAVE IMAGE SHOWED 
WHAT APPEARED TO BE A BANDING EYE, BUT BY 042238Z9 THE CONVECTION 
HAD ALREADY WEAKENED AND THE BANDING EYE HAD FILLED. UW-CIMSS 
SATELLITE DERIVED WIND PRODUCTS INDICATE MODERATE VERTICAL WIND 
SHEAR OVER THE SYSTEM, WITH VERTICAL WIND SHEAR INCREASING RAPIDLY 
TO THE NORTH. THE SYSTEM IS FORECAST TO DRIFT NORTH-NORTHWESTWARD 
THROUGH 36 HOURS, INTO A WEAKNESS IN THE SUBTROPICAL RIDGE. AFTER 
THIS TIME, A LOW LEVEL RIDGE WILL TAKE OVER THE STEERING FLOW AND 
TRACK THE SYSTEM WESTWARD TOWARD HAINAN DO. THE SYSTEM IS FORECAST 
TO WEAKEN AS IT MOVES INTO INCREASING VERTICAL WIND SHEAR.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 050000Z5 IS 16 FEET. REFER TO
WWPW30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 
050900Z4 (DTG 050751Z8), 051500Z1 (DTG 051351Z5), 052100Z8 (DTG 
051951Z1) AND 060300Z9 (DTG 060151Z3).//