WTPN31 PGTW 230900    
1. TROPICAL STORM 21W (RUSA) WARNING NR 004    
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   230600Z1 --- NEAR 16.7N4 160.1E8
     MOVEMENT PAST SIX HOURS - 300 DEGREES AT 12 KTS
     POSITION ACCURATE TO WITHIN 040 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT    
                            050 NM SOUTHEAST QUADRANT    
                            050 NM SOUTHWEST QUADRANT    
                            060 NM NORTHWEST QUADRANT    
   REPEAT POSIT: 16.7N4 160.1E8
    ---
   FORECASTS:
   12 HRS, VALID AT:
   231800Z4 --- 18.2N1 158.1E5
   MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
   RADIUS OF 050 KT WINDS - 020 NM 
   RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT    
                            060 NM SOUTHEAST QUADRANT    
                            060 NM SOUTHWEST QUADRANT    
                            070 NM NORTHWEST QUADRANT    
   VECTOR TO 24 HR POSIT: 305 DEG/ 13 KTS
    ---
   24 HRS, VALID AT:
   240600Z2 --- 19.7N7 155.8E9
   MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
   RADIUS OF 050 KT WINDS - 025 NM 
   RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT    
                            070 NM SOUTHEAST QUADRANT    
                            070 NM SOUTHWEST QUADRANT    
                            085 NM NORTHWEST QUADRANT    
   VECTOR TO 36 HR POSIT: 300 DEG/ 13 KTS
    ---
   36 HRS, VALID AT:
   241800Z5 --- 20.9N1 153.4E3
   MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
   RADIUS OF 050 KT WINDS - 030 NM 
   RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT    
                            080 NM SOUTHEAST QUADRANT    
                            080 NM SOUTHWEST QUADRANT    
                            100 NM NORTHWEST QUADRANT    
   VECTOR TO 48 HR POSIT: 290 DEG/ 13 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   250600Z3 --- 21.8N1 150.8E4
   MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT
   RADIUS OF 050 KT WINDS - 040 NM 
   RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT    
                            090 NM SOUTHEAST QUADRANT    
                            090 NM SOUTHWEST QUADRANT    
                            110 NM NORTHWEST QUADRANT    
   VECTOR TO 72 HR POSIT: 295 DEG/ 13 KTS
    ---
   72 HRS, VALID AT:
   260600Z4 --- 23.8N3 145.5E5
   MAX SUSTAINED WINDS - 115 KT, GUSTS 140 KT
   RADIUS OF 050 KT WINDS - 045 NM 
   RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT    
                            110 NM SOUTHEAST QUADRANT    
                            110 NM SOUTHWEST QUADRANT    
                            135 NM NORTHWEST QUADRANT    
    ---
REMARKS:
230900Z4 POSITION NEAR 17.1N9 159.6E1.
TROPICAL STORM (TS) 21W (RUSA), LOCATED APPROXIMATELY 830 NM EAST OF 
SAIPAN, HAS TRACKED WEST-NORTHWESTWARD AT 12 KNOTS OVER THE PAST 6 
HOURS. THE WARNING POSITION IS BASED ON 230530Z3 MULTISPECTRAL AND 
ENHANCED INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED 
ON SATELLITE CURRENT INTENSITY ESTIMATES OF 35 AND 45 KNOTS. 
ANIMATED WATER VAPOR IMAGERY INDICATES INCREASING DEEP CONVECTION 
AND ENHANCED POLEWARD OUTFLOW WRAPPING INTO AN UPPER LEVEL LOW 
NORTHEAST OF THE SYSTEM. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 230600Z 
IS 14 FEET. REFER TO WWPW30 RJTX FOR ADDITIONAL SEA HEIGHT 
INFORMATION. NEXT WARNINGS AT 231500Z1, 232100Z8, 240300Z9 AND 
240900Z5.//
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