WTPN31 PGTW 230900    
1. TYPHOON 26W (SHANSHAN) WARNING NR 024    
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   230600Z1 --- NEAR 28.8N8 167.3E7
     MOVEMENT PAST SIX HOURS - 030 DEGREES AT 14 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 095 KT, GUSTS 115 KT
   RADIUS OF 050 KT WINDS - 090 NM NORTHEAST SEMICIRCLE  
                            050 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 180 NM NORTHEAST SEMICIRCLE  
                            150 NM ELSEWHERE
   REPEAT POSIT: 28.8N8 167.3E7
    ---
   FORECASTS:
   12 HRS, VALID AT:
   231800Z4 --- 31.3N7 170.0E8
   MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 090 NM NORTHEAST SEMICIRCLE  
                            050 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 180 NM NORTHEAST SEMICIRCLE  
                            140 NM ELSEWHERE
   VECTOR TO 24 HR POSIT: 045 DEG/ 19 KTS
    ---
   24 HRS, VALID AT:
   240600Z2 --- 34.1N8 173.2E3
   MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 070 NM NORTHEAST SEMICIRCLE  
                            030 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 160 NM NORTHEAST SEMICIRCLE  
                            135 NM ELSEWHERE
   VECTOR TO 36 HR POSIT: 030 DEG/ 24 KTS
    ---
   36 HRS, VALID AT:
   241800Z5 --- 38.4N5 176.1E5
   MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 065 NM NORTHEAST SEMICIRCLE  
                            025 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 150 NM NORTHEAST SEMICIRCLE  
                            120 NM ELSEWHERE
   VECTOR TO 48 HR POSIT: 025 DEG/ 24 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   250600Z3 --- 42.7N3 178.7E3
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
   EXTRATROPICAL
    ---
REMARKS:
230900Z4 POSITION NEAR 29.4N5 168.0E5.
TYPHOON (TY) 26W (SHANSHAN), LOCATED APPROXIMATELY 800 NM WEST OF 
MIDWAY ISLAND, HAS TRACKED NORTH-NORTHEASTWARD AT 14 KNOTS DURING 
THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 230530Z3 VISIBLE 
AND INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON 
SATELLITE CURRENT INTENSITY ESTIMATES OF 90 AND 102 KNOTS. ANIMATED 
VISIBLE AND INFRARED SATELLITE IMAGERY INDICATES THE STORM HAS 
WEAKENED OVER THE PAST 6 HOURS. ALSO NOTABLE IN IMAGERY IS THE LACK 
OF CONVECTION IN THE SOUTHWESTERN QUADRANT. ANIMATED WATER VAPOR 
IMAGERY AND UW-CIMSS ANALYSIS INDICATES MODERATE VERTICAL WIND SHEAR 
FROM THE WEST-SOUTHWEST, WITH THE OUTFLOW BEGINNING TO BE RESTRICTED 
IN THE SOUTHWESTERN QUADRANT. TY 26W IS FORECAST TO TRACK
NORTHEASTWARD OVER THE NEXT 24 HOURS UNDER THE STEERING INFLUENCE OF 
A MID-LEVEL HIGH SITUATED EAST-SOUTHEAST OF THE SYSTEM. AFTERWARDS, 
THE SYSTEM IS FORECAST TO ACCELERATE INCREASINGLY NORTH-
NORTHEASTWARD AS IT BEGINS TO MERGE WITH THE MID-LATITUDE LOW TO THE 
NORTH-NORTHWEST. INCREASING WESTERLY SHEAR ASSOCIATED WITH THE MID-
LATITUDE TROUGH WILL SERVE TO WEAKEN THE SYSTEM AS IT BECOMES
EXTRATROPICAL BY THE 48 HOUR PERIOD. MAXIMUM SIGNIFICANT WAVE HEIGHT
AT 230600Z1 IS 30 FEET. REFER TO WWPW30 RJTX FOR ADDITIONAL SEA 
HEIGHT INFORMATION. NEXT WARNINGS AT 231500Z1 (DTG 231351Z5), 
232100Z8 (DTG 231951Z1), 240300Z9 (DTG 240151Z3) AND 240900Z5 (DTG 
240751Z9).//