WTPN31 PGTW 200300
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL STORM 03W (LINFA) WARNING NR 012
01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
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WARNING POSITION:
200000Z --- NEAR 20.2N 117.2E
MOVEMENT PAST SIX HOURS - 345 DEGREES AT 06 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 080 NM NORTHEAST QUADRANT
075 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
REPEAT POSIT: 20.2N 117.2E
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FORECASTS:
12 HRS, VALID AT:
201200Z --- 21.3N 117.6E
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 025 DEG/ 08 KTS
---
24 HRS, VALID AT:
210000Z --- 22.7N 118.3E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 030 DEG/ 09 KTS
---
36 HRS, VALID AT:
211200Z --- 24.3N 119.3E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 010 NM NORTHEAST QUADRANT
010 NM SOUTHEAST QUADRANT
010 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 035 DEG/ 08 KTS
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EXTENDED OUTLOOK:
48 HRS, VALID AT:
220000Z --- 25.6N 120.3E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 045 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 055 DEG/ 11 KTS
---
72 HRS, VALID AT:
230000Z --- 28.0N 124.4E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
RADIUS OF 034 KT WINDS - 025 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 070 DEG/ 16 KTS
---
LONG RANGE OUTLOOK:
NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 250 NM
ON DAY 4 AND 350 NM ON DAY 5... AND FOR INTENSITY
NEAR 20 KT EACH DAY.
---
96 HRS, VALID AT:
240000Z --- 30.1N 131.4E
MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
VECTOR TO 120 HR POSIT: 075 DEG/ 22 KTS
---
120 HRS, VALID AT:
250000Z --- 32.1N 141.5E
MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
---
REMARKS:
200300Z POSITION NEAR 20.5N 117.3E.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200000Z IS 18 FEET.
NEXT WARNINGS AT 200900Z, 201500Z, 202100Z AND 210300Z.
//
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WDPN31 PGTW 191500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 03W (LINFA)
WARNING NR 10//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
A. TROPICAL STORM (TS) 03W (LINFA) HAS SLOWLY INCREASED ITS
INTENSITY TO 60 KNOTS OVER THE LAST 12 HOURS. INTENSITY IS BASED ON
DVORAK ESTIMATES FROM PGTW AND KNES ALONG WITH A 190609Z TRMM IMAGE
SHOWING A MICROWAVE EYE-LIKE FEATURE. ANIMATED WATER VAPOR IMAGERY
CONTINUES TO SHOW GOOD EQUATORWARD OUTFLOW. POLEWARD OUTFLOW
CONTINUES TO BE HAMPERED BY MID-LEVEL ANTICYCLONE TO THE NORTH. TS
03W HAS ACCELERATED TOWARDS THE NORTH AS THE LOW- TO MID-LEVEL
SUBTROPICAL RIDGE (STR) TO THE EAST HAS STRENGTHENED AND A MID-LEVEL
RIDGE TO THE NORTH HAS ERODED.
3. FORECAST REASONING
A. FORECAST PHILOSOPHY HAS CHANGED SINCE THE PREVIOUS PROGNOSTIC
REASONING. FASTER THAN EXPECTED ERODING OF THE MID-LEVEL ANTICYCLONE
OVER SOUTHERN CHINA HAS CAUSED THE SYSTEM TO TRACK MORE NORTHWARD
THAN PREVIOUSLY PREDICTED.
B. TS 03W WILL CONTINUE TO TRACK SLOWLY OVER THE NEXT 24
TO 36 HOURS IN AN AREA OF COMPETING STEERING INFLUENCES. THE
COMPETING STEERING ENVIRONMENT IS COMPRISED OF A MID-LEVEL
ANTICYCLONE OVER SOUTHERN CHINA TO THE NORTH AND THE LOW- TO MID-
LEVEL SUBTROPICAL RIDGE TO THE EAST. AS THE ANTICYCLONE OVER CHINA
CONTINUES TO WEAKEN THROUGH TAU 36, TS 03W WILL SLOWLY ACCELERATE
AND TRACK NORTH-NORTHEASTERLY UNTIL COMING UNDER THE INFLUENCE OF
STRONG WESTERLY FLOW NEAR THE MID-LATITUDES. BETWEEN TAU 36-48, THE
SYSTEM IS EXPECTED TO TURN MORE EASTERLY AND TRACK ALONG A WEAK
BOUNDARY THAT EXTENDS FROM NORTHERN TAIWAN EASTWARD SOUTH OF HONSHU.
MODEL GUIDANCE IS IN POOR AGREEMENT DURING THE FIRST 48 HOURS WITH
TWO DISTINCT SCENARIOS. THE FIRST SCENARIO FAVORS A NORTHWARD TRACK
INTO SOUTHERN CHINA AND IS SUPPORTED BY JGSM AND EGRR (UKMO). THE
SECOND SCENARIO IS A DIRECT NORTHEASTERLY TRACK AS FAVORED BY WBAR,
GFS, AND GFDN. THE FIRST SCENARIO IS UNLIKELY DUE TO THE RESIDUAL
STRENGTH OF THE ANTICYCLONE OVER SOUTHERN CHINA AND THE SECOND
SCENARIO IS UNLIKELY DUE TO THE CURRENT MOTION OF 03W. THIS FORECAST
CLOSELY APPROXIMATES CONSENSUS, ECMWF AND NOGAPS WHICH SPLIT THE TWO
SCENARIOS THROUGH TAU 48 AND TRACK THE SYSTEM TO THE NORTH-NORTHEAST
THROUGH THE TAIWAN STRAIT, AND THEN IT FAVORS THE NORTHEAST TRACK OF
GFDN, GFS AND ECMWF. CONSENSUS IS SKEWED AFTER TAU 48 BY UKMO WHICH
TRACKS THE SYSTEM INTO CENTRAL ASIA.
C. BEYOND TAU 72, TS 03W IS EXPECTED TO ACCELERATE AND WEAKEN
TO TROPICAL DEPRESSION STRENGTH DUE TO UNFAVORABLE UPPER-LEVEL
NORTHEASTERLY WINDS ALOFT AND WILL BEGIN TO INTERACT WITH THE
BAROCLINIC ZONE AROUND TAU 96.
FORECAST TEAM: ECHO//
