WPAC: CHABA - Post-Tropical

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Re: WPAC: CHABA - Typhoon

#141 Postby 1900hurricane » Mon Oct 03, 2016 10:08 am

Here are obs for Kumejima proper and also for Kitahara. Gusts have already been reported to top 50 m/s.
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Re: WPAC: CHABA - Typhoon

#142 Postby 1900hurricane » Mon Oct 03, 2016 10:13 am

Brutal strike.

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Re: WPAC: CHABA - Typhoon

#143 Postby mrbagyo » Mon Oct 03, 2016 10:30 am

Image

Tropical cyclone symbol
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Re: WPAC: CHABA - Typhoon

#144 Postby euro6208 » Mon Oct 03, 2016 11:49 am

WDPN32 PGTW 031500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 21W (CHABA) WARNING NR
23//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
SUPER TYPHOON (STY) 21W (CHABA), LOCATED APPROXIMATELY 69 NM WEST-
SOUTHWEST OF KADENA AB, OKINAWA, JAPAN HAS TRACKED NORTH-
NORTHWESTWARD AT 09 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED
INFRARED SATELLITE IMAGERY DEPICTS A SLIGHT WEAKENING OF STY CHABA
OVER THE PAST SIX HOURS AS THE CONVECTIVE CORE HAS BECOME MORE
ASYMMETRIC AND THE CLOUD TOPS WITHIN THE EYEWALL HAVE WARMED. A
031009Z SSMIS 91GHZ MICROWAVE IMAGE FURTHER ILLUSTRATES THE
ELONGATED CORE STRUCTURE WITH THE BULK OF DEEP CONVECTION LOCATED TO
THE SOUTHWEST OF CENTER. HOWEVER, THE CYCLONE REMAINS VERY INTENSE
WITH A SHARP 5-NM EYE THAT SUPPORTS THE CURRENT POSITION WITH HIGH
CONFIDENCE. THE INTENSITY REMAINS AT 145 KNOTS BASED ON AN
ASSESSMENT OF DVORAK INTENSITY ESTIMATES FROM ALL AGENCIES.
SOUTHWESTERLY VERTICAL WIND SHEAR (VWS) HAS INCREASED TO 20-30 KNOTS
AND IS RESPONSIBLE FOR THE RECENT WEAKENING AND ELONGATION OF THE
CONVECTIVE STRUCTURE. A ROBUST POLEWARD OUTFLOW AND VERY WARM SEA
SURFACE TEMPERATURES (SSTS) ARE COMBINING TO FUEL THE STORM AND
SUSTAIN THE CURRENT INTENSITY. STY 21W IS APPROACHING THE WESTERN
AXIS OF A DEEP-LAYERED SUBTROPICAL RIDGE (STR) TO THE EAST.
3. FORECAST REASONING.
A. NO SIGNIFICANT CHANGE TO THE FORECAST PHILOSOPHY SINCE THE
PREVIOUS PROGNOSTIC REASONING BULLETIN.
B. STY CHABA WILL TURN NORTHWARD OVER THE NEXT 6 TO 12 HOURS AND
THEN NORTHEASTWARD AS IT ROUNDS THE STR AXIS. THE SYSTEM WILL
ENCOUNTER INCREASING VWS AS IT MOVES CLOSER TO THE STRONG ZONAL
WESTERLY FLOW SITUATED JUST SOUTH OF MAINLAND JAPAN AND SOUTH KOREA.
THIS WILL FORCE THE STORM TO FURTHER ELONGATE TO THE NORTHEAST AND
RAPIDLY WEAKEN. STY 21W WILL BEGIN EXTRA-TROPICAL TRANSITION (ETT)
NEAR TAU 36 AS IT EMBEDS WITHIN THE MID-LATITUDE WESTERLY FLOW ALONG
THE WESTERN EDGE OF MAINLAND JAPAN. IT WILL CONTINUE TO WEAKEN AS IT
TRACKS OVER THE COOL WATERS IN THE SEA OF JAPAN AND THEN ACROSS THE
RUGGED JAPANESE TERRAIN. STY CHABA WILL COMPLETE ETT AS IT RE-
EMERGES OVER THE WESTERN PACIFIC OCEAN. DYNAMIC MODEL GUIDANCE IS IN
TIGHT AGREEMENT THROUGHOUT THE FORECAST. ADDITIONALLY, GLOBAL MODEL
FIELDS SHOW NO CHANGE TO THE LOCATION OF THE MID-LATITUDE
WESTERLIES; THEREFORE, ONLY MINIMAL CHANGES TO THE FORECAST TRACK
ARE EXPECTED. GIVEN THESE FACTORS, THERE IS HIGH CONFIDENCE IN THE
JTWC FORECAST.//
NNNN
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Re: WPAC: CHABA - Typhoon

#145 Postby cycloneye » Mon Oct 03, 2016 12:26 pm

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Re: WPAC: CHABA - Typhoon

#146 Postby euro6208 » Mon Oct 03, 2016 12:37 pm

Read reports of a gust of 134 mph at Kitahara, Kume Island as the eye passed to the west of them.
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Re: WPAC: CHABA - Typhoon

#147 Postby 1900hurricane » Mon Oct 03, 2016 1:53 pm

Concentric eyewalls.

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Re: WPAC: CHABA - Typhoon

#148 Postby 1900hurricane » Mon Oct 03, 2016 5:30 pm

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Re: WPAC: CHABA - Typhoon

#149 Postby euro6208 » Mon Oct 03, 2016 6:35 pm

WDPN32 PGTW 032100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 21W (CHABA) WARNING NR
24//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
SUPER TYPHOON (STY) 21W (CHABA), LOCATED APPROXIMATELY 413 NM
SOUTH-SOUTHWEST OF SASEBO, JAPAN, HAS TRACKED NORTHWARD AT 09 KNOTS
OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE
IMAGERY DEPICTS A SLIGHT WEAKENING OF STY CHABA OVER THE PAST SIX
HOURS, HOWEVER, THE SYSTEM HAS RETAINED A 13-NM EYE, WHICH PROVIDES
GOOD CONFIDENCE IN THE CURRENT POSITION. A 031812Z SSMI 85GHZ IMAGE
AND RADAR IMAGERY SHOW A COMPACT CORE OF DEEP CONVECTION WITH A 90-
NM DIAMETER EYEWALL AND DEEP CONVECTIVE BANDING OVER THE NORTHWEST
QUADRANT. A ROBUST POLEWARD OUTFLOW AND VERY WARM SEA SURFACE
TEMPERATURES (SSTS) ARE COMBINING TO FUEL THE STORM AND SUSTAIN THE
CURRENT INTENSITY. THE CURRENT INTENSITY IS ASSESSED AT 135 KNOTS
BASED ON DVORAK ESTIMATES RANGING FROM 6.5 (127 KNOTS) TO 7.5 (155
KNOTS), AND A SATCON ESTIMATE OF 136 KNOTS. SOUTHWESTERLY VERTICAL
WIND SHEAR (VWS) HAS INCREASED TO 25-30 KNOTS AND IS RESPONSIBLE FOR
THE RECENT WEAKENING OF THE CONVECTIVE STRUCTURE. STY 21W IS
TRACKING NORTHWARD ALONG THE WESTERN PERIPHERY OF A DEEP-LAYERED
SUBTROPICAL RIDGE (STR) TO THE EAST.
3. FORECAST REASONING.
A. DECREASED THE INTENSITY FORECAST SIGNIFICANTLY AFTER TAU 12
DUE TO VERY STRONG VERTICAL WIND SHEAR EXPECTED NORTH OF 33N. THE 34-
KNOT WIND RADII HAVE BEEN ADJUSTED BASED ON DETAILED ANALYSIS OF
RECENT ASCAT IMAGERY.
B. STY CHABA WILL CONTINUE TRACKING NORTHWARD OVER THE NEXT 12
HOURS AND THEN NORTHEASTWARD AS IT ROUNDS THE STR AXIS. THE SYSTEM
WILL ENCOUNTER INCREASING VWS AS IT MOVES CLOSER TO THE STRONG ZONAL
WESTERLY FLOW SITUATED JUST SOUTH OF THE KOREAN PENINSULA. THIS WILL
FORCE THE SYSTEM TO FURTHER ELONGATE TO THE NORTHEAST AND RAPIDLY
WEAKEN. STY 21W WILL BEGIN EXTRA-TROPICAL TRANSITION (ETT) NEAR TAU
24 AS IT EMBEDS WITHIN THE MID-LATITUDE WESTERLY FLOW ALONG
THE WESTERN EDGE OF MAINLAND JAPAN, AND WILL COMPLETE ETT BY TAU 48.
IT WILL CONTINUE TO WEAKEN AS IT TRACKS OVER THE COOL WATERS IN THE
SEA OF JAPAN AND THEN ACROSS THE RUGGED JAPANESE TERRAIN. DYNAMIC
MODEL GUIDANCE IS IN TIGHT AGREEMENT THROUGHOUT THE FORECAST.
ADDITIONALLY, GLOBAL MODEL FIELDS SHOW NO CHANGE TO THE LOCATION OF
THE MID-LATITUDE WESTERLIES; THEREFORE, ONLY MINIMAL CHANGES TO THE
FORECAST TRACK ARE EXPECTED. GIVEN THESE FACTORS, THERE IS HIGH
CONFIDENCE IN THE JTWC FORECAST.//
NNNN
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Re: WPAC: CHABA - Typhoon

#150 Postby 1900hurricane » Mon Oct 03, 2016 10:51 pm

Looks like Chaba might be starting to get mid-latitudeitis, which is understandable considering it's almost to 30*N now. Chaba has certainly lived up to its namesakes, unlike Lupit and Nida earlier this year.

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Re: WPAC: CHABA - Typhoon

#151 Postby euro6208 » Mon Oct 03, 2016 11:15 pm

WDPN32 PGTW 040300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TYPHOON 21W (CHABA) WARNING NR 25//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TYPHOON (TY) 21W (CHABA), LOCATED APPROXIMATELY 361 NM SOUTH-
SOUTHWEST OF SASEBO, JAPAN, HAS TRACKED NORTH-NORTHWESTWARD AT 11
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY INDICATES A SLIGHT WEAKENING TREND WITH A 10-NM CLOUD-FILLED
EYE, WHICH PROVIDES GOOD CONFIDENCE IN THE CURRENT POSITION.
HOWEVER, A 032238Z SSMIS 91GHZ IMAGE AND RADAR IMAGERY SHOW A
COMPACT CORE OF DEEP CONVECTION WITH A 70-NM DIAMETER EYEWALL AND
DEEP CONVECTIVE BANDING OVER THE NORTHERN SEMI-CIRCLE. A ROBUST
POLEWARD OUTFLOW AND VERY WARM SEA SURFACE TEMPERATURES (SSTS) ARE
COMBINING TO FUEL THE STORM AND SUSTAIN THE CURRENT INTENSITY. THE
CURRENT INTENSITY IS ASSESSED AT 125 KNOTS BASED ON DVORAK ESTIMATES
RANGING FROM 5.5 (102 KNOTS) TO 7.5 (155 KNOTS). SOUTHWESTERLY
VERTICAL WIND SHEAR (VWS) HAS INCREASED TO 25-35 KNOTS AND IS
RESPONSIBLE FOR THE RECENT WEAKENING OF THE CONVECTIVE STRUCTURE. TY
21W IS TRACKING NORTHWARD ALONG THE WESTERN PERIPHERY OF A DEEP-
LAYERED SUBTROPICAL RIDGE (STR) TO THE EAST.
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING MESSAGE.
B. TY CHABA WILL CONTINUE TRACKING NORTHWARD OVER THE NEXT 12
HOURS AND THEN NORTHEASTWARD AS IT ROUNDS THE STR AXIS. THE SYSTEM
WILL ENCOUNTER INCREASING VWS AS IT MOVES CLOSER TO THE STRONG ZONAL
WESTERLY FLOW SITUATED JUST SOUTH OF THE KOREAN PENINSULA. THIS WILL
FORCE THE SYSTEM TO FURTHER ELONGATE TO THE NORTHEAST AND RAPIDLY
WEAKEN. TY 21W WILL BEGIN EXTRA-TROPICAL TRANSITION (ETT) NEAR TAU
24 AS IT EMBEDS WITHIN THE MID-LATITUDE WESTERLY FLOW ALONG THE
WESTERN EDGE OF MAINLAND JAPAN, AND WILL COMPLETE ETT BY TAU 48.
IT WILL CONTINUE TO WEAKEN AS IT TRACKS OVER THE COOL WATERS IN THE
SEA OF JAPAN AND THEN ACROSS THE RUGGED JAPANESE TERRAIN. DYNAMIC
MODEL GUIDANCE IS IN TIGHT AGREEMENT THROUGHOUT THE FORECAST.
ADDITIONALLY, GLOBAL MODEL FIELDS SHOW NO CHANGE TO THE LOCATION OF
THE MID-LATITUDE WESTERLIES; THEREFORE, ONLY MINIMAL CHANGES TO THE
FORECAST TRACK ARE EXPECTED. GIVEN THESE FACTORS, THERE IS HIGH
CONFIDENCE IN THE JTWC FORECAST.//
NNNN
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Re: WPAC: CHABA - Typhoon

#152 Postby 1900hurricane » Mon Oct 03, 2016 11:31 pm

Heh, that's quite a range there.

CURRENT INTENSITY IS ASSESSED AT 125 KNOTS BASED ON DVORAK ESTIMATES
RANGING FROM 5.5 (102 KNOTS) TO 7.5 (155 KNOTS).
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Re: WPAC: CHABA - Typhoon

#153 Postby euro6208 » Tue Oct 04, 2016 1:41 am

https://weather.com/storms/typhoon/news/super-typhoon-chaba-okinawa-japan-forecast

Only 2 other Cat5 eq. TCs of record nr Kumejima Is. (w/in 65 nm) dating to '60s. JTWC winds (145kts), JMA pressure (905mb) beat both.
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Re: WPAC: CHABA - Typhoon

#154 Postby euro6208 » Tue Oct 04, 2016 4:43 pm

WDPN32 PGTW 042100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TYPHOON 21W (CHABA) WARNING NR 28//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
TYPHOON (TY) 21W (CHABA), LOCATED APPROXIMATELY 160 NM WEST-
SOUTHWEST OF SASEBO, JAPAN, HAS TRACKED NORTH-NORTHEASTWARD AT 15
KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE
IMAGERY DEPICTS A RAPIDLY DETERIORATING SYSTEM WITH DEEP CONVECTION
SHEARED OVER THE NOTHERN SEMI-CIRCLE OF A PARTIALLY-EXPOSED LOW-
LEVEL CIRCULATION CENTER (LLCC). HOWEVER, KMA RADAR IMAGERY SHOWS A
PARTIAL EYEWALL OVER THE NORTH QUADRANT OF THE LLCC AND ALSO A BROAD
CENTER JUST SOUTH TO SOUTHEAST OF CHEJU ISLAND. RADAR ANIMATION
INDICATES THAT THE CENTER IS CURRENTLY PASSING SOUTH OF THE ISLAND
AS IT RE-CURVES NORTHEASTWARD. SURFACE OBSERVATIONS FROM CHEJU
INTERNATIONAL AIRPORT (RKPC), 60NM NORTH OF THE 04/18Z CENTER
POSITION, REVEAL SUSTAINED NORTH-NORTHEASTERLY WINDS OF 45 KNOTS
GUSTING TO 68 KNOTS ASSOCIATED WITH THE EYEWALL CONVECTION. SURFACE
OBSERVATIONS FROM WESTERN KYUSHU, AHEAD OF THE SYSTEM, ARE STILL
RELATIVELY LOW AT 20 TO 30 KNOTS BUT EXPECTED TO INCREASE. A 041755Z
SSMI 85GHZ IMAGE SHOWS A DEVELOPING WEAK COLD FRONT MOVING OVER
WESTERN KYUSHU, WHICH IS INDICATIVE OF THE EARLY STAGES OF EXTRA-
TROPICAL TRANSITION (ETT). OVERALL, THERE IS GOOD CONFIDENCE IN THE
CURRENT POSITION AND RECENT TRACK MOTION CHANGE BASED ON THE
AVAILABLE RADAR IMAGERY. THE CURRENT INTENSITY IS ASSESSED AT 85
KNOTS BASED ON THE LOWER RANGE OF DVORAK INTENSITY ESTIMATES AND THE
WEAKENED STRUCTURE. UPPER-LEVEL ANALYSIS INDICATES STRONG
SOUTHWESTERLY VERTICAL WIND SHEAR (VWS) OFFSET SLIGHTLY BY ENHANCED
POLEWARD OUTFLOW. TY CHABA IS TRACKING NORTH-NORTHEASTWARD ALONG THE
NORTHWEST PERIPHERY OF THE DEEP-LAYERED SUBTROPICAL RIDGE (STR).
3. FORECAST REASONING.
A. NO CHANGE TO THE FORECAST PHILOSOPHY SINCE THE PREVIOUS
PROGNOSTIC REASONING MESSAGE.
B. TY CHABA WILL CONTINUE TO ACCELERATE NORTHEASTWARD AS IT
ROUNDS THE STR AXIS AND ENTERS THE MIDLATITUDE WESTERLIES.
SIGNIFICANT WEAKENING IS EXPECTED TO OCCUR DUE TO COOLER SSTS AND
INCREASING VWS. THE SYSTEM IS EXPECTED TO COMPLETE ETT BY TAU 24 AS
IT GAINS FRONTAL CHARACTERISTICS AND BECOMES EMBEDDED WITHIN THE
MIDLATITUDE WESTERLIES. THIS EXTRATROPICAL LOW IS THEN FORECAST TO
CROSS HONSHU, WHICH WILL SERVE TO FURTHER WEAKEN THE SYSTEM. DYNAMIC
GUIDANCE REMAINS IN TIGHT AGREEMENT, THEREFORE, THERE IS HIGH
CONFIDENCE IN THE JTWC FORECAST TRACK.//
NNNN
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Re: WPAC: CHABA - Tropical Storm

#155 Postby euro6208 » Wed Oct 05, 2016 5:21 am

Image

WTPN32 PGTW 050900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL STORM 21W (CHABA) WARNING NR 030
DOWNGRADED FROM TYPHOON 21W
01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
050600Z --- NEAR 36.2N 131.3E
MOVEMENT PAST SIX HOURS - 050 DEGREES AT 34 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT
120 NM SOUTHEAST QUADRANT
075 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
REPEAT POSIT: 36.2N 131.3E
---
FORECASTS:
12 HRS, VALID AT:
051800Z --- 39.5N 140.5E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL
VECTOR TO 24 HR POSIT: 065 DEG/ 44 KTS
---
24 HRS, VALID AT:
060600Z --- 42.9N 151.2E
MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL
---
REMARKS:
050900Z POSITION NEAR 37.0N 133.6E.
TROPICAL STORM 21W (CHABA), LOCATED APPROXIMATELY 121 NM NORTH-
NORTHWEST OF IWAKUNI, JAPAN, HAS TRACKED NORTHEASTWARD AT 34
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY DEPICTS A FULLY EXPOSED AND EXPANDING LOW LEVEL CIRCULATION
CENTER (LLCC) WITH VIRTUALLY NO BANDING FEATURES REMAINING. A
050636Z SSMIS 91 GHZ IMAGE SHOWS THE BULK OF CONVECTION BEING
SHEARED TO THE NORTHEAST OF A VERY BROAD AND ELONGATED LOW LEVEL
FEATURE, GIVING LOW CONFIDENCE TO THE INITIAL POSITION. THE SYSTEM
IS ALSO SHOWING SIGNIFICANT FRONTAL FEATURES AT THIS TIME AS
OBSERVED FROM RECENT JMA RADAR IMAGERY. THE INITIAL INTENSITY IS
ASSESSED AT 50 KNOTS AND BASED ON THE DETERIORATING CONVECTIVE
STRUCTURE AND THE LOWER END OF DVORAK ESTIMATES RANGING FROM T3.0 TO
T5.0 (45 TO 90 KNOTS RESPECTIVELY). THE LLCC WAS OBSERVED IN
SATELLITE IMAGERY TO HAVE RECENTLY SKIRTED THE COAST OF SOUTH KOREA,
DISRUPTING THE LOW LEVEL FLOW AND AIDING IN THE RAPID WEAKENING.
SUSTAINED WIND VALUES OF 45 KNOTS WERE OBSERVED FROM BUSAN, SOUTH
KOREA AS THE LLCC PASSED CLOSE BY. TS CHABA IS NEARLY FULLY EMBEDDED
IN THE BAROCLINIC ZONE, MAKING THE TRANSITION INTO AN EXTRATROPICAL
SYSTEM. BY TAU 12 TS CHABA IS EXPECTED TO BE FULLY EXTRATROPICAL.
THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON
WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR
SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 050600Z
IS 12 FEET.
//
NNNN
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Re: WPAC: CHABA - Tropical Storm

#156 Postby dexterlabio » Wed Oct 05, 2016 7:49 am

There's a fuss in Twitter regarding a "tsunami" that hit Busan. Apparently the culprit was Chaba, and there was no earthquake.
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Re: WPAC: CHABA - Post-Tropical

#157 Postby NotoSans » Sun Oct 16, 2016 12:39 am

An interesting paper published by the Meteorological Research Institute of JMA (in Japanese) about the peak intensity of Chaba.
http://www.mri-jma.go.jp/Topics/H28/281 ... 161007.pdf

Some key points:
- Chaba attained a minimum central pressure of 905 mb at its peak.
- The central pressure was around 920 mb when Chaba passed near Kumejima.

The central pressure is estimated using Doppler Radar observations. The methodology is described in details in the following technical review published by JMA.
http://www.jma.go.jp/jma/jma-eng/jma-ce ... xt18-2.pdf
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