
Another Monster Brewing...
WTPN32 PGTW 201500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/192151ZOCT2013//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. TROPICAL DEPRESSION 28W (TWENTYEIGHT) WARNING NR 001
03 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:
201200Z --- NEAR 10.3N 160.6E
MOVEMENT PAST SIX HOURS - 245 DEGREES AT 11 KTS
POSITION ACCURATE TO WITHIN 020 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
WIND RADII VALID OVER OPEN WATER ONLY
REPEAT POSIT: 10.3N 160.6E
---
FORECASTS:
12 HRS, VALID AT:
210000Z --- 11.3N 159.7E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 24 HR POSIT: 315 DEG/ 10 KTS
---
24 HRS, VALID AT:
211200Z --- 12.7N 158.2E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 315 DEG/ 13 KTS
---
36 HRS, VALID AT:
220000Z --- 14.4N 156.3E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT
075 NM SOUTHEAST QUADRANT
075 NM SOUTHWEST QUADRANT
085 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 305 DEG/ 16 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
221200Z --- 16.1N 153.6E
MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 025 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
025 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 - 115 NM NORTHEAST QUADRANT
110 NM SOUTHEAST QUADRANT
105 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 295 DEG/ 13 KTS
---
72 HRS, VALID AT:
231200Z --- 18.4N 148.5E
MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 035 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 070 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 140 NM NORTHEAST QUADRANT
135 NM SOUTHEAST QUADRANT
120 NM SOUTHWEST QUADRANT
130 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 315 DEG/ 11 KTS
---
LONG RANGE OUTLOOK:
---
96 HRS, VALID AT:
241200Z --- 21.7N 145.2E
MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 120 HR POSIT: 355 DEG/ 13 KTS
---
120 HRS, VALID AT:
251200Z --- 26.7N 144.6E
MAX SUSTAINED WINDS - 095 KT, GUSTS 115 KT
WIND RADII VALID OVER OPEN WATER ONLY
---
REMARKS:
201500Z POSITION NEAR 10.6N 160.4E.
TROPICAL DEPRESSION 28W (TWENTYEIGHT), LOCATED APPROXIMATELY 943
NM EAST OF ANDERSEN AFB, GUAM, HAS TRACKED WEST-SOUTHWESTWARD AT 11
KNOTS OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT
201200Z IS 7 FEET. NEXT WARNINGS AT 202100Z, 210300Z, 210900Z AND
211500Z. THIS WARNING SUPERSEDES AND CANCELS REF A (WTPN22 PGTW
192200). REFER TO TYPHOON 26W (FRANCISCO) WARNINGS (WTPN33 PGTW)
FOR SIX-HOURLY UPDATES. //
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WDPN32 PGTW 201500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL DEPRESSION 28W (TWENTYEIGHT)
WARNING NR 01//
RMKS//
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TROPICAL DEPRESSION (TD) 28W (TWENTYEIGHT), LOCATED APPROXIMATELY
943 NM EAST OF ANDERSEN AFB, GUAM, HAS TRACKED WEST-SOUTHWESTWARD AT
11 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED (EIR)
SATELLITE IMAGERY DEPICTS A CONSOLIDATING SYSTEM WITH DEEPENING
CENTRAL CONVECTION AND FORMATIVE BANDING ALONG THE EASTERN AND
SOUTHERN FLANK. THE INITIAL POSITION IS BASED ON A LOW LEVEL NOTCH
FEATURE ON A 201006Z AMSU-B MICROWAVE IMAGE WITH POOR CONFIDENCE. THE
INITIAL INTENSITY IS BASED ON CONGRUENT DVORAK ESTIMATES OF 25 KNOTS
FROM PGTW, RJTD, AND KNES. UPPER LEVEL ANALYSIS INDICATES THE SYSTEM
IS JUST TO THE EAST OF A TROUGH THAT IS CAUSING SUBSIDENCE ALONG ITS
NORTHWEST QUADRANT. HOWEVER, VIGOROUS EASTWARD AND EQUATORWARD
OUTFLOW ARE EVIDENT ON ANIMATED WATER VAPOR IMAGERY AND HELPING
SUSTAIN THE CONVECTION. THE CYCLONE IS CURRENTLY TRACKING ALONG THE
OUTERMOST PERIPHERY OF A LOW REFLECTION OF THE SUBTROPICAL RIDGE
(STR) WELL TO THE NORTH.
3. FORECAST REASONING.
A. THIS IS THE INITIAL PROGNOSTIC REASONING BULLETIN AND SETS THE
FORECAST PHILOSOPHY.
B. THE STR WILL BE THE PRIMARY STEERING MECHANISM FOR TD 28W.
HENCE, THE SYSTEM IS EXPECTED TO TRACK GENERALLY WEST-NORTHWESTWARD
OVER THE NEXT 72 HOURS. RELATIVELY LOW VERTICAL WIND SHEAR (VWS) AND
GOOD EQUATORWARD OUTFLOW, IN ADDITION TO THE PERENNIALLY WARM SEA
SURFACE TEMPERATURES IN THE AREA, WILL ENSURE GRADUAL
INTENSIFICATION. THE TD WILL REACH TYPHOON INTENSITY AT 90 KNOTS BY
TAU 72.
C. AFTER TAU 72, TD 28W WILL BEGIN TO ROUND THE STR AXIS AND TRACK
ON A MORE NORTHWARD DIRECTION. THE ADDITION OF A POLEWARD OUTFLOW
CHANNEL ASSOCIATED WITH THE MID-LATITUDE WESTERLIES WILL ENHANCE
FURTHER INTENSIFICATION, PEAKING AT 105 KNOTS BY TAU 96. AFTER TAU
96, INCREASING VWS AND COOLING SEA SURFACE TEMPERATURES WILL BEGIN TO
ERODE THE SYSTEM. NUMERIC MODEL GUIDANCE ARE IN A FAIRLY TIGHT
AGREEMENT - UNUSUAL AT THIS EARLY STAGE OF DEVELOPMENT - WITH SOME
VARIANCE AT THE NORTHWARD TURN NEAR TAU 72. HOWEVER, DUE TO THE
UNCERTAINTY IN THE STORM MOTION IN THE NEAR TERM, THE CONFIDENCE IN
THE JTWC TRACK FORECAST IS TENTATIVELY LOW. //
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