WPAC HAGUPIT (PAGASA: Nina): Typhoon - Discussion

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WPAC HAGUPIT (PAGASA: Nina): Typhoon - Discussion

#1 Postby HURAKAN » Mon Sep 15, 2008 3:38 pm

Image

AN AREA OF CONVECTION HAS PERSISTED NEAR 18.0N 147.5E,
APPROXIMATELY 300 NM NORTHEAST OF GUAM. ANIMATED METSAT IMAGERY INDI-
CATES IMPROVED CONSOLIDATION OVER THE PAST 12 HOURS WITH A 142019Z
QSCAT PASS DEPICITNG A DEVELOPING LOW-LEVEL CIRCULATION CENTER (LLCC)
WITH LIGHT WINDS NEAR THE CENTER. THE LLCC IS LOCATED WITHIN A
GENERALLY FAVORABLE ENVIRONMENT WITH WEAK VERTICAL WIND SHEAR
AND WARM SST, HOWEVER, A LACK OF CONVECTION AND POOR SURFACE
CONSOLIDATION ARE LIMITING DEVELOPMENT AT THIS TIME. MAXIMUM
SUSTAINED SURFACE WINDS ARE ESTIMATED AT 10 TO 15 KNOTS. MIN-
IMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1008 MB. THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE
WITHIN THE NEXT 24 HOURS IS POOR.
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#2 Postby HURAKAN » Tue Sep 16, 2008 9:06 am

Image

THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 18.4N
146.1E IS NOW LOCATED NEAR 18.1N 145.8E, APPROXIMATELY 285 NM
NORTH-NORTHEAST OF GUAM. ANIMATED MULTISPECTRAL SATELLITE IMAGERY
SHOWS PATCHY DEEP CONVECTION FLARING OVER A WEAK BUT DEVELOPING
LOW LEVEL CIRCULATION CENTER (LLCC). THIS DISTURBANCE LIES BENEATH
THE AXIS OF AN UPPER LEVEL ANTICYCLONE IN A REGION OF LOW VERTICAL
WIND SHEAR AND FAVORABLE DIFFLUENCE ALOFT. ENHANCING THIS DIFFLU-
ENCE ARE TWO TROPICAL UPPER TROPOSPHERIC TROUGH (TUTT) CELLS TO
THE WEST AND TO THE EAST OF THE LLCC. MAXIMUM SUSTAINED SURFACE
WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE
IS ESTIMATED TO BE NEAR 1007 MB. BASED ON VERY FAVORABLE UPPER
LEVEL CONDITIONS, THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS FAIR.
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#3 Postby HURAKAN » Tue Sep 16, 2008 1:54 pm

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Convection has increased.
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Re: WPAC INVEST 93W: Discussion

#4 Postby HURAKAN » Wed Sep 17, 2008 6:44 am

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#5 Postby HURAKAN » Wed Sep 17, 2008 6:47 am

THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 18.1N
145.8E IS NOW LOCATED NEAR 17.4N 144.2E, APPROXIMATELY 240 NM
NORTH OF GUAM. ANIMATED MULTISPECTRAL SATELLITE IMAGERY SHOWS
DEEP CONVECTION FLARING OVER AND NEAR A WEAK LOW LEVEL CIRC-
ULATION CENTER (LLCC). THIS DISTURBANCE LIES IN A REGION OF
MODERATE VERTICAL WIND SHEAR ASSOCIATED WITH A TROPICAL UPPER
TROPOSPHERIC TROUGH (TUTT) CELL TO THE EAST OF THE LLCC. THE
VERTICAL WIND SHEAR HAS SLOWED THE ORGANIZATION OF THIS DIS-
TURBANCE, BUT AS THE LLCC TRACKS WESTWARD THE VERTICAL SHEAR
IS FORECAST TO DECREASE AND THIS TUTT CELL WILL BEGIN TO AID
THE UPPER LEVEL DIFFLUENCE. THIS WILL CREATE A MORE FAVORABLE
ENVIRONMENT FOR DEVELOPMENT. MAXIMUM SUSTAINED SURFACE WINDS
ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE
IS ESTIMATED TO BE NEAR 1007 MB. BASED ON THE FORECAST FOR
IMPROVED UPPER LEVEL CONDITIONS, THE POTENTIAL FOR THE
DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE
NEXT 24 HOURS REMAINS FAIR.
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Re: WPAC INVEST 93W: Discussion

#6 Postby HURAKAN » Wed Sep 17, 2008 9:54 am

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#7 Postby Chacor » Wed Sep 17, 2008 11:28 am

TROPICAL DEPRESSION 1008 HPA AT 17N 142E WNW 10 KT.
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#8 Postby HURAKAN » Wed Sep 17, 2008 2:00 pm

17/1430 UTC 17.4N 142.1E T1.5/1.5 93W -- West Pacific Ocean
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Re: WPAC INVEST 93W: Discussion

#9 Postby HURAKAN » Wed Sep 17, 2008 5:53 pm

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17/2030 UTC 16.8N 141.1E TOO WEAK 93W -- West Pacific Ocean
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#10 Postby Chacor » Wed Sep 17, 2008 10:46 pm

WTPN21 PGTW 172330
SUBJ/TROPICAL CYCLONE FORMATION ALERT//
RMKS/WTPN21 PGTW 172330
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
160 NM EITHER SIDE OF A LINE FROM 17.2N 142.3E TO 18.3N 137.2E
WITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY
ISSUANCE OF NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME.
WINDS IN THE AREA ARE ESTIMATED TO BE 17 TO 22 KNOTS. METSAT IM-
AGERY AT 172300Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 16.9N 140.6E. THE SYSTEM IS MOVING WEST-NORTHWESTWARD AT 08
KNOTS.
2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 17.4N
144.2E IS NOW LOCATED NEAR 16.9N 140.6E, APPROXIMATELY 285 NM NORTH-
WEST OF GUAM. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS A
FULLY-EXPOSED (BUT TIGHTLY-WRAPPED) LOW-LEVEL CIRCULATION
CENTER (LLCC) WITH DEEP CONVECTION ALONG THE SOUTHERN PERIPHERY. A
171618Z AMSR-E IMAGE INDICATED DEEP CONVECTION PERSISTING WITHIN
CONVERGENT FLOW ON THE SOUTHERN FLANK WITH IMPROVED LOW-LEVEL
STRUCTURE. A 172041Z QUIKSCAT IMAGE SHOWS AN IMPROVING, SYMMETRIC
LLCC WITH NUMEROUS 15-20 KNOT UNFLAGGED WINDS THROUGH ALL QUADRANTS.
UPPER-LEVEL ANALYSIS INDICATES A SOMEWHAT MARGINAL ENVIRONMENT WITH
MODERATE, NORTHERLY VERTICAL WIND SHEAR (VWS) AND FAIR OUTFLOW,
HOWEVER, THERE IS A DEVELOPING ANTICYCLONE OVER THE CENTER AND THE
DISTURBANCE IS FORECAST TO TRACK WESTWARD INTO A MORE FAVORABLE
ENVIRONMENT WITH DECREASING VWS, WHICH SHOULD ALLOW THE DEEP
CONVECTION TO RE-DEVELOP. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED TO BE NEAR 17-22 KNOTS. MINIMUM SEA LEVEL PRESSURE IS
ESTIMATED TO BE NEAR 1006 MB. THE POTENTIAL FOR DEVELOPMENT OF
A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS GOOD.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED
BY 182330Z.//
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#11 Postby HURAKAN » Thu Sep 18, 2008 6:10 am

Image

Image

Not looking very organized.
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#12 Postby Chacor » Thu Sep 18, 2008 10:04 pm

This became TD 18W at 21z.

Also a JMA TD now, warned TD#21 of the year.

WTPQ21 RJTD 190000
RSMC TROPICAL CYCLONE ADVISORY
NAME TD
ANALYSIS
PSTN 190000UTC 14.4N 135.2E POOR
MOVE W 13KT
PRES 1006HPA
MXWD 030KT
GUST 045KT
FORECAST
24HF 200000UTC 14.7N 130.8E 120NM 70%
MOVE W 10KT
PRES 1000HPA
MXWD 035KT
GUST 050KT =
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Re: WPAC INVEST 93W: Discussion

#13 Postby RattleMan » Thu Sep 18, 2008 11:16 pm

PAGASA names it:

Severe Weather Bulletin Number ONE
Tropical Cyclone Alert: Tropical Depression "NINA"
Issued at 11:00 a.m., Friday, 19 September 2008 A Tropical Depression has entered the Philippine Area of Responsibility and was named "NINA".
Location of Center:
(as of 10:00 a.m.) 1,080 kms East of Virac, Catanduanes
Coordinates: 14.3°N, 134.9°E
Strength: Maximum sustained winds of 55 kph near the center
Movement: West Northwest at 11 kph
Forecast Positions/Outlook: Saturday morning:
850 kms East Northeast of Virac, Catanduanes
Sunday morning:
620 kms East Northeast of Virac, Catanduanes
Monday morning:
450 kms Northeast of Virac, Catanduanes or
560 kms East of Casiguran, Aurora


No Public Storm Warning Signals Raised


Tropical Depression "NINA" is still too far to affect any part of the country.

The public and the disaster coordinating councils concerned are advised to take appropriate actions and watch for the next bulletin to be issued at 11 p.m. today.
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#14 Postby RL3AO » Fri Sep 19, 2008 12:29 am

WTPN32 PGTW 190300
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL DEPRESSION 18W (EIGHTEEN) WARNING NR 002
02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
---
WARNING POSITION:
190000Z --- NEAR 15.2N 136.0E
MOVEMENT PAST SIX HOURS - 255 DEGREES AT 13 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: 15.2N 136.0E
---
FORECASTS:
12 HRS, VALID AT:
191200Z --- 15.3N 134.6E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 24 HR POSIT: 280 DEG/ 07 KTS
---
24 HRS, VALID AT:
200000Z --- 15.5N 133.2E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 285 DEG/ 07 KTS
---
36 HRS, VALID AT:
201200Z --- 15.9N 131.7E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 295 DEG/ 07 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
210000Z --- 16.5N 130.3E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
080 NM SOUTHWEST QUADRANT
090 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 300 DEG/ 07 KTS
---
72 HRS, VALID AT:
220000Z --- 17.9N 127.7E
MAX SUSTAINED WINDS - 075 KT, GUSTS 090 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 - 050 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 115 NM NORTHEAST QUADRANT
105 NM SOUTHEAST QUADRANT
105 NM SOUTHWEST QUADRANT
115 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 300 DEG/ 07 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:
230000Z --- 19.4N 125.1E
MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
WIND RADII VALID OVER OPEN WATER ONLY
VECTOR TO 120 HR POSIT: 300 DEG/ 06 KTS
---
120 HRS, VALID AT:
240000Z --- 20.6N 122.7E
MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT
WIND RADII VALID OVER OPEN WATER ONLY
---
REMARKS:
190300Z POSITION NEAR 15.2N 135.7E.
TROPICAL DEPRESSION (TD) 18W, LOCATED APPROXIMATELY 515 NM
WEST-NORTHWEST OF GUAM, HAS TRACKED WEST-SOUTHWESTWARD AT
13 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT
WAVE HEIGHT AT 190000Z IS 7 FEET. NEXT WARNINGS AT 190900Z,
191500Z, 192100Z AND 200300Z. REFER TO TROPICAL STORM
15W (SINLAKU) WARNINGS (WTPN31 PGTW) FOR SIX-HOURLY
UPDATES.//
NNNN


JTWC forecasting a pretty strong storm.
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#15 Postby Chacor » Fri Sep 19, 2008 2:39 am

WTPQ21 RJTD 190600
RSMC TROPICAL CYCLONE ADVISORY
NAME TD
ANALYSIS
PSTN 190600UTC 13.8N 133.9E POOR
MOVE WSW 13KT
PRES 1004HPA
MXWD 030KT
GUST 045KT
FORECAST
24HF 200600UTC 14.6N 129.9E 120NM 70%
MOVE W 10KT
PRES 1000HPA
MXWD 035KT
GUST 050KT =
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#16 Postby Chacor » Fri Sep 19, 2008 4:03 am

JTWC has upgraded to 40-kt TS 18W.

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#17 Postby HURAKAN » Fri Sep 19, 2008 8:16 am

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Intense convection.
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#18 Postby Chacor » Fri Sep 19, 2008 8:23 am

Reminder that Nina is not an official name.
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#19 Postby Chacor » Fri Sep 19, 2008 8:33 am

Now officially named:
WTPQ21 RJTD 191200
RSMC TROPICAL CYCLONE ADVISORY
NAME TS 0814 HAGUPIT (0814) UPGRADED FROM TD
ANALYSIS
PSTN 191200UTC 13.8N 132.7E POOR
MOVE W 11KT
PRES 1004HPA
MXWD 035KT
GUST 050KT
30KT 120NM
FORECAST
24HF 201200UTC 14.5N 129.2E 70NM 70%
MOVE W 09KT
PRES 990HPA
MXWD 045KT
GUST 065KT
48HF 211200UTC 16.2N 127.7E 110NM 70%
MOVE NW 06KT
PRES 975HPA
MXWD 060KT
GUST 085KT
72HF 221200UTC 18.2N 127.1E 160NM 70%
MOVE NNW SLOWLY
PRES 965HPA
MXWD 070KT
GUST 100KT =
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Re: WPAC HAGUPIT (PAGASA: Nina): Tropical Storm - Discussion

#20 Postby HURAKAN » Fri Sep 19, 2008 1:58 pm

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Convection expands.
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