
WTPN32 PGTW 170900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL DEPRESSION 12W (TWELVE) WARNING NR 002
02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
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WARNING POSITION:
170600Z --- NEAR 20.6N 125.2E
MOVEMENT PAST SIX HOURS - 135 DEGREES AT 10 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
REPEAT POSIT: 20.6N 125.2E
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FORECASTS:
12 HRS, VALID AT:
171800Z --- 20.3N 126.9E
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 24 HR POSIT: 075 DEG/ 07 KTS
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24 HRS, VALID AT:
180600Z --- 20.7N 128.4E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 36 HR POSIT: 050 DEG/ 05 KTS
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36 HRS, VALID AT:
181800Z --- 21.4N 129.3E
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 005 DEG/ 04 KTS
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EXTENDED OUTLOOK:
48 HRS, VALID AT:
190600Z --- 22.2N 129.4E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
055 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
055 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 315 DEG/ 04 KTS
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72 HRS, VALID AT:
200600Z --- 23.4N 128.0E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
075 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 295 DEG/ 08 KTS
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LONG RANGE OUTLOOK:
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96 HRS, VALID AT:
210600Z --- 24.6N 124.8E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 120 HR POSIT: 290 DEG/ 07 KTS
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120 HRS, VALID AT:
220600Z --- 25.5N 121.8E
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
---
REMARKS:
170900Z POSITION NEAR 20.5N 125.6E.
TROPICAL DEPRESSION 12W (TWELVE), LOCATED APPROXIMATELY 382 NM
SOUTH-SOUTHWESTWARD OF KADENA AB, HAS TRACKED SOUTHEASTWARD AT 10
KNOTS OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT
170600Z IS 11 FEET. NEXT WARNINGS AT 171500Z, 172100Z, 180300Z AND
180900Z. REFER TO TROPICAL DEPRESSION 13W (THIRTEEN) WARNINGS
(WTPN33 PGTW) FOR SIX-HOURLY UPDATES.//
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WDPN32 PGTW 170900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL DEPRESSION 12W (TWELVE)
WARNING NR 02//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TROPICAL DEPRESSION 12W (TWELVE), LOCATED APPROXIMATELY 382 NM
SOUTH-SOUTHWESTWARD OF KADENA AB, HAS TRACKED SOUTHEASTWARD AT 10
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY (MSI) INDICATES A CONSOLIDATING, YET SLIGHTLY ELONGATED, LOW-
LEVEL CIRCULATION CENTER (LLCC) WITH INCREASING DEEP CONVECTION
AROUND THE WESTERN AND SOUTHERN PERIPHERIES OF THE SYSTEM. THIS IS
ALSO EVIDENT IN A 170332Z TRMM 37GHZ MICROWAVE. THE INITIAL POSITION
IS BASED ON THE MSI AND AFOREMENTIONED MICROWAVE IMAGE WITH FAIR TO
LOW CONFIDENCE DUE TO THE ELONGATED NATURE OF THE LLCC. THE INITIAL
INTENSITY HAS BEEN INCREASED TO 30 KNOTS WHICH IS SLIGHTLY HIGHER
THAN DVORAK INTENSITY ESTIMATES FROM ALL AGENCIES DUE TO THE
CONSOLIDATING STRUCTURE OF THE SYSTEM. UPPER-LEVEL ANALYSIS
INDICATES THE SYSTEM IS JUST NORTH OF THE SUBTROPICAL RIDGE (STR)
AXIS IN A FAVORABLE ENVIRONMENT CHARACTERIZED BY GOOD EQUATORWARD
OUTFLOW AND LOW TO MODERATE (05 TO 15 KNOTS) VERTICAL WIND SHEAR. TD
12W IS CURRENTLY TRACKING ALONG THE LOW TO MID-LEVEL STEERING RIDGE
SOUTH OF THE SYSTEM.
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING.
B. TD 12W IS EXPECTED TO TRACK WEST ALONG THE PERIPHERY OF THE
STEERING RIDGE THROUGH THE NEXT 36 HOURS. AFTER TAU 36 THE STEERING
INFLUENCES WILL BECOME WEAK AS THE SYSTEM WILL BE POSITIONED BETWEEN
TWO STEERING RIDGES, THE CURRENT STEERING RIDGE TO THE SOUTH AND A
BUILDING RIDGE NORTH OF THE SYSTEM. AFTER TAU 48, THE RIDGE TO THE
NORTH IS EXPECTED TO BUILD AND ALONG WITH MOTION INDUCED BY DIRECT
CYCLONE INTERACTION (DCI) WITH NEIGHBORING TD 13W, SHOULD DRIVE THE
SYSTEM WEST. TD 12W IS FORECAST TO INTENSIFY AS FAVORABLE
ENVIRONMENTAL CONDITIONS OF GOOD OUTFLOW AND LOW VWS ARE EXPECTED
THROUGH THIS PORTION OF THE FORECAST PERIOD. ALTHOUGH, THE
PROXIMITY AND INTENSITY OF TD 13W COULD CREATE A LESS FAVORABLE
ENVIRONMENT WHICH WOULD LEAD TO A LOWER INTENSITY FORECAST.
C. TD 12W IS EXPECTED CONTINUE TO INTERACT WITH TD 13W IN THE
EXTENDED TAUS, AND EVENTUALLY MERGE INTO EACH OTHER BY TAU 120. SLOW
INTENSIFICATION IS EXPECTED TO CONTINUE AS THESE TWO SYSTEMS
CONSOLIDATE AND REACH TYPHOON STRENGTH BY TAU 120. DYNAMIC MODEL
GUIDANCE IS SPREAD THROUGH THE FORECAST PERIOD DUE TO THE PROXIMITY
OF TD 13W, AND THE DCI, AS TWO DIFFERENT SCENARIOS HAVE BECOME
CLEAR. SOME MODELS CONTINUE TO SHOW THE CONTINUED DCI WHILE SOME
SEEM TO INDICATE THAT TD 12W WILL BECOME THE DOMINANT CIRCULATION IN
THIS SCENARIO AND CALL FOR TD 13W TO WEAKEN AS TD 12W CREATES AN
UNFAVORABLE UPPER-LEVEL ENVIRONMENT. THERE IS LOW CONFIDENCE IN THE
FORECAST DUE TO THIS.//
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