SUBJ:  TROPICAL CYCLONE WARNING
WTPN31 PGTW 180900    
1. TROPICAL STORM 26W WARNING NR 004    
   01 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   180600Z5 --- NEAR 15.6N2 171.5E4
     MOVEMENT PAST SIX HOURS - 320 DEGREES AT 06 KTS
     POSITION ACCURATE TO WITHIN 040 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
   RADIUS OF 035 KT WINDS - 055 NM NORTHEAST SEMICIRCLE  
                            045 NM ELSEWHERE
   REPEAT POSIT: 15.6N2 171.5E4
    ---
   FORECASTS:
   12 HRS, VALID AT:
   181800Z8 --- 16.5N2 170.6E4
   MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
   RADIUS OF 050 KT WINDS - 025 NM 
   RADIUS OF 035 KT WINDS - 070 NM NORTHEAST SEMICIRCLE  
                            050 NM ELSEWHERE
   VECTOR TO 24 HR POSIT: 315 DEG/ 07 KTS
    ---
   24 HRS, VALID AT:
   190600Z6 --- 17.4N2 169.6E2
   MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
   RADIUS OF 050 KT WINDS - 035 NM 
                            020 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 080 NM NORTHEAST SEMICIRCLE  
                            060 NM ELSEWHERE
   VECTOR TO 36 HR POSIT: 315 DEG/ 06 KTS
    ---
   36 HRS, VALID AT:
   191800Z9 --- 18.3N2 168.7E2
   MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
   RADIUS OF 050 KT WINDS - 050 NM NORTHEAST SEMICIRCLE  
                            035 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 100 NM NORTHEAST SEMICIRCLE  
                            080 NM ELSEWHERE
   VECTOR TO 48 HR POSIT: 315 DEG/ 08 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   200600Z8 --- 19.5N5 167.5E9
   MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT
   RADIUS OF 050 KT WINDS - 055 NM NORTHEAST SEMICIRCLE  
                            045 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 115 NM NORTHEAST SEMICIRCLE  
                            090 NM ELSEWHERE OVER WATER
   VECTOR TO 72 HR POSIT: 325 DEG/ 06 KTS
    ---
   72 HRS, VALID AT:
   210600Z9 --- 21.4N7 166.0E3
   MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
   RADIUS OF 050 KT WINDS - 070 NM NORTHEAST SEMICIRCLE  
                            050 NM ELSEWHERE
   RADIUS OF 035 KT WINDS - 125 NM NORTHEAST SEMICIRCLE  
                            100 NM ELSEWHERE
    ---
REMARKS:
180900Z8 POSITION NEAR 15.8N4 171.3E2.
TROPICAL STORM (TS) 26W, LOCATED APPROXIMATELY 355 NM SOUTHEAST OF
WAKE ISLAND, HAS TRACKED NORTHWESTWARD AT 06 KNOTS DURING THE PAST 6
HOURS. THE WARNING POSITION IS BASED ON 180530Z7 VISIBLE SATELLITE
IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT 
INTENSITY ESTIMATES OF 35 TO 55 KNOTS. ANIMATED VISIBLE IMAGERY 
DEPICTS A WELL DEFINED, 60 NM CENTRAL DENSE OVERCAST (CDO) OVER THE 
LOW-LEVEL CIRCULATION CENTER. DEEP CONVECTION HAS INTENSIFIED OVER 
THE PREVIOUS 6 HOURS WITH AN INCREASE IN SPIRAL BANDING WRAPPING IN 
TOWARD THE CENTER OF THE CIRCULATION. UW-CIMSS AND 200 MB ANALYSIS 
INDICATE LIGHT TO MODERATE VERTICAL WIND SHEAR WITH GOOD DIFFLUENCE 
ALOFT. ANIMATED WATER VAPOR IMAGERY DEPICTS A TROPICAL UPPER 
TROPOSPHERIC LOW NORTHWEST OF TS 26W, WHICH IS ENHANCING OUTFLOW 
ALOFT. TS 26W SHOULD TRACK GENERALLY NORTHWESTWARD WITHIN A WEAKNESS 
IN THE RIDGE THROUGH THE PERIOD. TS 26W IS FORECAST TO INTENSIFY 
THROUGH THE PERIOD UNDER AN IMPROVING ENVIRONMENT. MAXIMUM 
SIGNIFICANT WAVE HEIGHT AT 180600Z5 IS 12 FEET. REFER TO WWPW30 RJTX 
FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 181500Z5 
(DTG 181351Z9), 182100Z2 (DTG 181951Z5), 190300Z3 (DTG 190151Z7) AND 
190900Z9 (DTG 190751Z3). REFER TO TYPHOON 25W (SONAMU) FINAL WARNING 
(WTPN32 PGTW).//