
WTPN31 PGTW 050300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TYPHOON 26W (BOPHA) WARNING NR 038
01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
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WARNING POSITION:
050000Z --- NEAR 10.0N 119.7E
MOVEMENT PAST SIX HOURS - 285 DEGREES AT 12 KTS
POSITION ACCURATE TO WITHIN 055 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
080 NM SOUTHWEST QUADRANT
100 NM NORTHWEST QUADRANT
REPEAT POSIT: 10.0N 119.7E
---
FORECASTS:
12 HRS, VALID AT:
051200Z --- 10.8N 118.0E
MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
100 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 305 DEG/ 06 KTS
---
24 HRS, VALID AT:
060000Z --- 11.5N 116.9E
MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT
085 NM SOUTHEAST QUADRANT
085 NM SOUTHWEST QUADRANT
105 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 305 DEG/ 04 KTS
---
36 HRS, VALID AT:
061200Z --- 12.0N 116.2E
MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
055 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 115 NM NORTHEAST QUADRANT
095 NM SOUTHEAST QUADRANT
095 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 315 DEG/ 04 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
070000Z --- 12.6N 115.6E
MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 055 NM NORTHEAST QUADRANT
055 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
055 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT
100 NM SOUTHEAST QUADRANT
100 NM SOUTHWEST QUADRANT
115 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 315 DEG/ 02 KTS
---
72 HRS, VALID AT:
080000Z --- 13.1N 115.1E
MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 045 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT
100 NM SOUTHEAST QUADRANT
095 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 295 DEG/ 02 KTS
---
LONG RANGE OUTLOOK:
---
96 HRS, VALID AT:
090000Z --- 13.4N 114.5E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 120 HR POSIT: 290 DEG/ 02 KTS
---
120 HRS, VALID AT:
100000Z --- 13.6N 113.9E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
---
REMARKS:
050300Z POSITION NEAR 10.2N 119.3E.
TYPHOON 26W (BOPHA) LOCATED APPROXIMATELY 200 NM NORTHWEST OF
ZAMBOANGA, PHILIPPINES HAS TRACKED WEST-NORTHWESTWARD AT 12 KNOTS
OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 050000Z
IS 29 FEET. NEXT WARNINGS AT 050900Z, 051500Z, 052100Z AND 060300Z.//
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WDPN31 PGTW 050300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TYPHOON 26W (BOPHA) WARNING NR 38//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TYPHOON 26W (BOPHA) LOCATED APPROXIMATELY 200 NM NORTHWEST OF
ZAMBOANGA, PHILIPPINES HAS TRACKED WEST-NORTHWESTWARD AT 12 KNOTS
OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY
(MSI) SHOWS NEWLY FORMING OVERSHOOTING TOPS OVER THE LOW-LEVEL
CIRCULATION CENTER (LLCC) AS THE SYSTEM NEARS NORTHERN PALAWAN. THE
CURRENT POSITION IS BASED ON THE MSI IMAGERY AND SIMILAR CENTER FIX
POSITIONS FROM PGTW AND RJTD WITH FAIR CONFIDENCE. THE CURRENT
INTENSITY IS BASED ON AGREEABLE DVORAK ESTIMATES OF 77 KNOTS FROM ALL
REPORTING AGENCIES AS WELL AS CONGRUENT OBJECTIVE INTENSITY
ESTIMATES. UPPER-LEVEL ANALYSIS INDICATES TY 26W IS LOCATED A FEW
DEGREES SOUTHEAST OF A COL REGION BETWEEN THE SUBTROPICAL RIDGES
CENTERED TO THE EAST AND WEST. POLEWARD OUTFLOW, ENHANCED BY A
CONNECTION INTO THE MID-LATITUDE WESTERLIES, IS PROVIDING THE MAIN
EXHAUST MECHANISM FOR TY 26W AS EQUATORWARD OUTFLOW IS NO LONGER
CROSS EQUATORIAL. VERTICAL WIND SHEAR (VWS) REMAINS WEAK AT 10 TO 15
KNOTS. TY 26W IS CURRENTLY STEERING ALONG THE SOUTHWEST PERIPHERY OF
THE EASTERN LOBE OF THE SUBTROPICAL RIDGE (STR) AND STEERING TOWARDS
THE COL REGION.
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING MESSAGE.
B. TY 26W IS FORECAST TO CONTINUE TRACKING GENERALLY
WEST-NORTHWESTWARD ALONG THE SOUTHWESTERN PERIPHERY OF THE EASTERN
STR TOWARDS THE COL. SLIGHT INTENSIFICATION TO A PEAK OF 90 KNOTS IS
EXPECTED TO OCCUR BY TAU 36 AND INTO TAU 48 DUE TO FAVORABLE SEA
SURFACE TEMPERATURES AND OUTFLOW. BY TAU 72 A WEAKENING TREND SHOULD
COMMENCE AS OCEAN HEAT CONTENT DECREASES AND VWS INCREASES AND A
NORTHEAST MONSOON SURGE BEGINS TO PUSH INTO THE SOUTH CHINA SEA.
C. DURING DAYS FOUR AND FIVE TY 26W WILL ENCOUNTER A STRONG
NORTHEAST MONSOON SURGE AND ENTER A VERY WEAK STEERING ENVIRONMENT
UNDERNEATH THE COL REGION. THE SYSTEM IS EXPECTED TO TRACK SLOW AND
PERHAPS ERRATIC WITH A LOOPING MOTION NOT OUT OF THE QUESTION.
HOWEVER, DUE TO THE COMPLEXITIES OF FORECASTING SUCH A MOTION WITH
VALIDITY THE FORECAST PHILOSOPHY IS TO KEEP THE TRACK SPEEDS SLOW AND
GENERALLY WEST TO EVEN SOUTHWEST AS THE SYSTEM INGESTS DRY AIR IN THE
MID-LEVELS AND VWS INCREASES, PERHAPS BEGINNING TO DECOUPLE THE DEEP
CONVECTION FROM THE LLCC. OBJECTIVE AID GUIDANCE HAS NOT CHANGED MUCH
IN THE PAST 12 HOURS AS THERE CONTINUES TO BE LARGE SPREAD IN THE
CONSENSUS MEMBERS. THIS LATEST RUN HOWEVER DOES SHOW MORE TRACKERS
INDICATING A CLOCKWISE LOOP BUT THE DEGREE OF TURN VARIES GREATLY.
JGSM CONTINUES TO PORTRAY A WESTWARD TRACK. ALL IN ALL THE LOOPING
TRACKERS JUST CONFIRMS THE WEAK STEERING ENVIRONMENT AND THIS IS WHY
THE OFFICIAL JTWC TRACK FORECAST REMAINS CONSISTENT WITH THE PREVIOUS
FORECAST WITH SLOW TRACK SPEEDS INDICATING QUASI-STATIONARY MOVEMENT
IN THE EXTENDED FORECAST WITH A GRADUAL WEAKENING TREND. DUE TO THE
LARGE SPREAD IN TRACKERS, LOW TRACK CONFIDENCE REMAINS.//
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