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阿拉伯海北部强气旋风暴“沙赫提”(ARB 02/02A.Shakhti) - 将西行回旋 - JTWC:75KT

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发表于 2025-10-5 04:25 | 显示全部楼层
本帖最后由 ygsj24 于 2025-10-5 06:00 编辑

WTIO31 PGTW 042100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 008//
RMKS/
1. TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 008   
   01 ACTIVE TROPICAL CYCLONE IN NORTHIO
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   041800Z --- NEAR 21.1N 62.5E
     MOVEMENT PAST SIX HOURS - 250 DEGREES AT 09 KTS
     POSITION ACCURATE TO WITHIN 040 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 064 KT WINDS - 010 NM NORTHEAST QUADRANT
                            010 NM SOUTHEAST QUADRANT
                            015 NM SOUTHWEST QUADRANT
                            010 NM NORTHWEST QUADRANT
   RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
                            030 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            035 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 055 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            060 NM SOUTHWEST QUADRANT
                            060 NM NORTHWEST QUADRANT
   REPEAT POSIT: 21.1N 62.5E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   050600Z --- 20.7N 61.4E
   MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 064 KT WINDS - 010 NM NORTHEAST QUADRANT
                            000 NM SOUTHEAST QUADRANT
                            000 NM SOUTHWEST QUADRANT
                            010 NM NORTHWEST QUADRANT
   RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
                            020 NM SOUTHEAST QUADRANT
                            030 NM SOUTHWEST QUADRANT
                            030 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            050 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 240 DEG/ 04 KTS
    ---
   24 HRS, VALID AT:
   051800Z --- 20.3N 60.6E
   MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 064 KT WINDS - 000 NM NORTHEAST QUADRANT
                            000 NM SOUTHEAST QUADRANT
                            010 NM SOUTHWEST QUADRANT
                            000 NM NORTHWEST QUADRANT
   RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
                            020 NM SOUTHEAST QUADRANT
                            020 NM SOUTHWEST QUADRANT
                            010 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            050 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   VECTOR TO 36 HR POSIT: 235 DEG/ 02 KTS
    ---
   36 HRS, VALID AT:
   060600Z --- 20.1N 60.3E
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
                            010 NM SOUTHEAST QUADRANT
                            020 NM SOUTHWEST QUADRANT
                            000 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 045 NM NORTHEAST QUADRANT
                            045 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            045 NM NORTHWEST QUADRANT
   VECTOR TO 48 HR POSIT: 160 DEG/ 03 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   061800Z --- 19.6N 60.5E
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
                            040 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            030 NM NORTHWEST QUADRANT
   VECTOR TO 72 HR POSIT: 105 DEG/ 03 KTS
    ---
   72 HRS, VALID AT:
   071800Z --- 19.3N 61.7E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
042100Z POSITION NEAR 21.0N 62.2E.
04OCT25. TROPICAL CYCLONE 02A (SHAKHTI), LOCATED APPROXIMATELY
212 NM EAST-NORTHEAST OF MASIRAH ISLAND, HAS TRACKED WEST-
SOUTHWESTWARD AT 09 KNOTS OVER THE PAST SIX HOURS.
MINIMUM CENTRAL PRESSURE AT 041800Z IS 976 MB. MAXIMUM
SIGNIFICANT WAVE HEIGHT AT 041800Z IS 20 FEET. NEXT WARNINGS AT
050300Z, 050900Z, 051500Z AND 052100Z.//
NNNN





  1. WDIO31 PGTW 042100
  2. MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
  3. SUBJ/PROGNOSTIC REASONING FOR TROPICAL CYCLONE 02A (SHAKHTI) WARNING
  4. NR 008//
  5. RMKS/
  6. 1. FOR METEOROLOGISTS.
  7. 2. 6 HOUR SUMMARY AND ANALYSIS.

  8. SUMMARY:
  9.    INITIAL POSITION: 21.1N 62.5E
  10.    INITIAL INTENSITY: 75 KTS
  11.    GEOGRAPHIC REFERENCE: 212 NM EAST-NORTHEAST OF MASIRAH ISLAND
  12.    MOVEMENT PAST 6 HOURS: WEST-SOUTHWESTWARD AT 09 KTS
  13.    SIGNIFICANT WAVE HEIGHT: 20 FEET

  14. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
  15. ANIMATED ENHANCED INFRARED (EIR) SATELLITE IMAGERY DEPICTS DRY AIR
  16. BOUNDING THE NORTHWESTERN QUADRANT OF THE CONVECTIVE ENVELOPE OF
  17. TROPICAL CYCLONE (TC) 02A. ENHANCED VERTICAL WIND SHEAR FROM THE
  18. NORTHWEST APPLIES AN APPARENT TILT TO THE VERTICAL STRUCTURE. WATER
  19. VAPOR IMAGERY REVEALS STRONG POLEWARD OUTFLOW ENHANCED BY AN
  20. UPPER-LEVEL TROUGH TO THE NORTH AND STRONG EQUATORWARD OUTFLOW. THE
  21. INITIAL POSITION IS PLACED WITH LOW CONFIDENCE BASED ON THE
  22. AFOREMENTIONED ANIMATED EIR, WHICH DEPICTED CENTRAL DENSE OVERCAST
  23. CONVECTION OBSCURING THE LOW-LEVEL CIRCULATION CENTER. THE INITIAL
  24. INTENSITY OF 75 KTS IS ASSESSED WITH MEDIUM CONFIDENCE BASED ON THE
  25. AGENCY AND OBJECTIVE FIXES LISTED BELOW.

  26. INITIAL WIND RADII BASIS: 041607Z METOP-B SCATTEROMETER DATA

  27. CURRENT STEERING MECHANISM: A COMPETING STEERING ENVIRONMENT
  28. BETWEEN A DEEP-LAYER RIDGE OVER THE ARABIAN PENINSULA AND A
  29. NEAR-EQUATORIAL RIDGE OVER SOUTHERN INDIA.

  30. AGENCY DVORAK AND AUTOMATED FIXES:
  31.    PGTW: T4.0 - 65 KTS
  32.    KNES: T3.5 - 55 KTS
  33.    DEMS: T3.5 - 55 KTS
  34.    CIMSS SATCON: 62 KTS AT 041653Z
  35.    CIMSS ADT: 79 KTS AT 041800Z
  36.    CIMSS AIDT: 75 KTS AT 041700Z
  37.    CIMSS D-PRINT: 72 KTS AT 041800Z

  38. FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: MARGINALLY FAVORABLE
  39.    VWS: 15-20 KTS
  40.    SST: 26-27 CELSIUS
  41.    OUTFLOW: STRONG POLEWARD AND EQUATORWARD

  42. ANALYSIS CONFIDENCE:
  43.    INITIAL POSITION: HIGH
  44.    INITIAL INTENSITY: MEDIUM
  45.    INITIAL WIND RADII: HIGH

  46. 3. FORECAST REASONING.

  47. SIGNIFICANT FORECAST CHANGES: THERE ARE NO SIGNIFICANT CHANGES TO
  48. THE FORECAST FROM THE PREVIOUS WARNING.

  49. FORECAST DISCUSSION: TC 02A WILL TRACK SOUTHWESTWARD FOR THE NEXT
  50. 24 HOURS WHILE REMAINING IN A COMPLEX STEERING ENVIRONMENT BETWEEN
  51. A DEEP-LAYER RIDGE OVER THE ARABIAN PENINSULA AND A NEAR-EQUATORIAL
  52. RIDGE TO THE SOUTHEAST. THE NEAR-EQUATORIAL RIDGE WILL WEAKEN AFTER
  53. TAU 36 AS A DEEP-LAYER TROUGH DEEPENS OVER INDIA, RESULTING IN A
  54. GRADUAL TRACK RECURVE EASTWARD FROM TAU 36-72. HIGH VERTICAL WIND
  55. SHEAR AND DRY AIR WILL ERODE THE VERTICAL STRUCTURE OF TC 02A.
  56. AFTER TAU 24, THERE WILL BE MINIMAL AVAILABLE WARM SEA SURFACE
  57. TEMPERATURES DUE TO SLOWING TRACK MOTION AND ENHANCED UPWELLING IN
  58. THE SOMALI JET REGION. THE WEAKENING RATE WILL SIGNIFICANTLY
  59. INCREASE, LEADING TO COMPLETE DISSIPATION BY THE END OF THE
  60. FORECAST PERIOD.

  61. MODEL DISCUSSION: DETERMINISTIC MODEL GUIDANCE IS IN MODERATELY
  62. GOOD AGREEMENT THAT TC 02A WILL TRACK SOUTHWESTWARD AND RECURVE
  63. EASTWARD BETWEEN 36-60 HOURS. HOWEVER, THE DIFFERENCES BETWEEN
  64. MODEL SOLUTIONS VARY BASED ON HOW STRONGLY THE NEAR EQUATORIAL
  65. RIDGE WEAKENS. THERE IS MINIMAL SPREAD IN THE INTENSITY GUIDANCE,
  66. WHICH INDICATES CONTINUED WEAKENING TROUGH THE FORECAST PERIOD.

  67. FORECAST CONFIDENCE:
  68.    TRACK 00-72 HR: LOW
  69.    INTENSITY 00-72 HR: HIGH//
  70. NNNN
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发表于 2025-10-5 05:30 | 显示全部楼层


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发表于 2025-10-5 09:21 | 显示全部楼层
本帖最后由 ygsj24 于 2025-10-5 12:00 编辑

WTIO31 PGTW 050300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 009//
RMKS/
1. TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 009   
   01 ACTIVE TROPICAL CYCLONE IN NORTHIO
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   050000Z --- NEAR 21.0N 61.3E
     MOVEMENT PAST SIX HOURS - 265 DEGREES AT 11 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 064 KT WINDS - 010 NM NORTHEAST QUADRANT
                            010 NM SOUTHEAST QUADRANT
                            015 NM SOUTHWEST QUADRANT
                            010 NM NORTHWEST QUADRANT
   RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
                            030 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            035 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            060 NM SOUTHWEST QUADRANT
                            050 NM NORTHWEST QUADRANT
   REPEAT POSIT: 21.0N 61.3E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   051200Z --- 20.6N 60.4E
   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
                            030 NM SOUTHWEST QUADRANT
                            020 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 225 DEG/ 04 KTS
    ---
   24 HRS, VALID AT:
   060000Z --- 20.0N 59.8E
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
                            050 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            030 NM NORTHWEST QUADRANT
   VECTOR TO 36 HR POSIT: 180 DEG/ 01 KTS
    ---
   36 HRS, VALID AT:
   061200Z --- 19.8N 59.8E
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT
                            030 NM SOUTHEAST QUADRANT
                            030 NM SOUTHWEST QUADRANT
                            010 NM NORTHWEST QUADRANT
   VECTOR TO 48 HR POSIT: 120 DEG/ 02 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   070000Z --- 19.6N 60.2E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
050300Z POSITION NEAR 20.9N 61.1E.
05OCT25. TROPICAL CYCLONE 02A (SHAKHTI), LOCATED APPROXIMATELY
145 NM EAST-NORTHEAST OF MASIRAH ISLAND, HAS TRACKED WESTWARD AT
11 KNOTS OVER THE PAST SIX HOURS.
MINIMUM CENTRAL PRESSURE AT 050000Z IS 980 MB. MAXIMUM
SIGNIFICANT WAVE HEIGHT AT 050000Z IS 18 FEET. NEXT WARNINGS AT
050900Z, 051500Z, 052100Z AND 060300Z.
//
NNNN





  1. WDIO31 PGTW 050300
  2. MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
  3. SUBJ/PROGNOSTIC REASONING FOR TROPICAL CYCLONE 02A (SHAKHTI) WARNING
  4. NR 009//
  5. RMKS/
  6. 1. FOR METEOROLOGISTS.
  7. 2. 6 HOUR SUMMARY AND ANALYSIS.

  8. SUMMARY:
  9.    INITIAL POSITION: 21.0N 61.3E
  10.    INITIAL INTENSITY: 70 KTS
  11.    GEOGRAPHIC REFERENCE: 145 NM EAST-NORTHEAST OF MASIRAH ISLAND
  12.    MOVEMENT PAST 6 HOURS: WESTWARD AT 11 KTS
  13.    SIGNIFICANT WAVE HEIGHT: 18 FEET

  14. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
  15. ANIMATED ENHANCED INFRARED (EIR) SATELLITE IMAGERY DEPICTS DEEP
  16. CONVECTION TILTED SOUTHEASTWARD OF THE LOW-LEVEL CIRCULATION CENTER
  17. (LLCC) OF TROPICAL CYCLONE (TC) 02A. THE VERTICAL TILT WITH HEIGHT
  18. IS DUE TO HIGH VERTICAL WIND SHEAR AND ACCOMPANYING DRY AIR FROM
  19. THE NORTHWEST. THE INITIAL POSITION IS PLACED WITH LOW CONFIDENCE
  20. BASED ON THE OBSCURED LOW-LEVEL CENTER BELOW THE DEEP CONVECTION
  21. DEPICTED IN THE AFOREMENTIONED ANIMATED EIR. THE INITIAL INTENSITY
  22. OF 70 KTS IS ASSESSED WITH LOW CONFIDENCE BASED ON THE AGENCY AND
  23. OBJECTIVE FIXES LISTED BELOW.

  24. INITIAL WIND RADII BASIS: PERSISTENCE

  25. CURRENT STEERING MECHANISM: COMPETING STEERING ENVIRONMENT BETWEEN
  26. TWO DEEP LAYER RIDGES

  27. AGENCY DVORAK AND AUTOMATED FIXES:
  28.    PGTW: T4.0 - 65 KTS
  29.    KNES: T4.5 - 77 KTS
  30.    DEMS: T3.5 - 55 KTS
  31.    CIMSS SATCON: 66 KTS AT 042150Z
  32.    CIMSS ADT: 72 KTS AT 050000Z
  33.    CIMSS AIDT: 81 KTS AT 042000Z
  34.    CIMSS D-MINT: 66 KTS AT 050016Z
  35.    CIMSS D-PRINT: 70 KTS AT 050000Z

  36. FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: MARGINALLY
  37. UNFAVORABLE
  38.    VWS: 15-20 KTS
  39.    SST: 26-27 CELSIUS
  40.    OUTFLOW: STRONG POLEWARD AND EQUATORWARD

  41. ANALYSIS CONFIDENCE:
  42.    INITIAL POSITION: LOW
  43.    INITIAL INTENSITY: LOW
  44.    INITIAL WIND RADII: LOW

  45. 3. FORECAST REASONING.

  46. SIGNIFICANT FORECAST CHANGES: THERE ARE NO SIGNIFICANT CHANGES TO
  47. THE FORECAST FROM THE PREVIOUS WARNING.

  48. FORECAST DISCUSSION: TC 02A WILL WEAKLY TRACK SOUTHWESTWARD FOR THE
  49. NEXT 24 HOURS WHILE REMAINING IN A COMPETING STEERING ENVIRONMENT.
  50. AFTER TAU 24, A DEEP-LAYER TROUGH WILL WEAKEN THE STEERING RIDGE TO
  51. THE SOUTHEAST, RESULTING IN A BRIEF QUASI STATIONARY PERIOD BEFORE
  52. THE SYSTEM CURVES SOUTHEASTWARD THROUGH THE REMAINDER OF THE
  53. FORECAST PERIOD. HIGH VERTICAL WIND SHEAR AND DRY AIR WILL CONTINUE
  54. TO ERODE THE STRUCTURE OF TC 02A AND WEAKENING WILL CONTINUE FOR
  55. THE REMAINDER OF THE FORECAST PERIOD. UPWELLING WILL INCREASE THE
  56. RATE OF WEAKENING AS THE TRACK SPEED SLOWS. ULTIMATELY, TC 02A WILL
  57. DISSIPATE BY THE END OF THE FORECAST PERIOD.

  58. MODEL DISCUSSION: DETERMINISTIC MODEL GUIDANCE IS IN MODERATE
  59. AGREEMENT THAT TC 02A WILL TRACK SOUTHWESTWARD SLOWLY OVER THE NEXT
  60. 24-36 HOURS, FOLLOWED BY A SLOW AND GRADUAL CURVE TOWARDS THE
  61. EASTWARD DIRECTION. EXCLUDING OUTLIERS OF GFS AND NAVGEM, THERE IS
  62. AN APPROXIMATELY 50NM CROSS-TRACK SPREAD BY THE END OF THE FORECAST
  63. PERIOD. THE INTENSITY GUIDANCE FOLLOWS SUIT AND IS IN HIGH
  64. AGREEMENT THAT WEAKENING WILL BE CONTINUOUS WHILE IN UNFAVORABLE
  65. CONDITIONS AND DISSIPATION WILL OCCUR BETWEEN TAU 36-60.

  66. FORECAST CONFIDENCE:
  67.    TRACK 00-72 HR: HIGH
  68.    INTENSITY 00-72 HR: MEDIUM//
  69. NNNN
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发表于 2025-10-5 10:40 | 显示全部楼层
全球热带气旋监测公报
预报:徐润杰、刘涛  签发:许映龙  2025 年 10 月 05 日 10 时
“沙赫提”向西南方向移动

时        间:   5日08时(北京时,下同)

海        域:    北印度洋

命        名:    “沙赫提”,SHAKHTI

中心位置:    北纬21.0度,东经62.0度

强度等级:    强气旋风暴

最大风力:    11级,32米/秒,相当于我国的强热带风暴级

中心气压:    990百帕

参考位置:    距离阿曼马斯喀特东南方向约470公里

变化过程:    过去24小时,“沙赫提”强度由10级加强为11级

预报结论:   “沙赫提”将以每小时15公里左右的速度向西偏南方向移动,强度缓慢减弱



图3 卫星红外监测图像(北京时间2025年10月5日08时00分)

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发表于 2025-10-5 12:40 | 显示全部楼层




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发表于 2025-10-5 15:51 | 显示全部楼层
本帖最后由 ygsj24 于 2025-10-5 18:00 编辑

WTIO31 PGTW 050900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 010//
RMKS/
1. TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 010   
   01 ACTIVE TROPICAL CYCLONE IN NORTHIO
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   050600Z --- NEAR 20.5N 61.4E
     MOVEMENT PAST SIX HOURS - 245 DEGREES AT 05 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT
                            020 NM SOUTHEAST QUADRANT
                            020 NM SOUTHWEST QUADRANT
                            020 NM NORTHWEST QUADRANT
   RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
                            035 NM SOUTHEAST QUADRANT
                            035 NM SOUTHWEST QUADRANT
                            035 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
                            080 NM SOUTHEAST QUADRANT
                            070 NM SOUTHWEST QUADRANT
                            060 NM NORTHWEST QUADRANT
   REPEAT POSIT: 20.5N 61.4E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   051800Z --- 20.1N 60.7E
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 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 - 050 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 225 DEG/ 03 KTS
    ---
   24 HRS, VALID AT:
   060600Z --- 19.7N 60.3E
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
                            040 NM SOUTHEAST QUADRANT
                            030 NM SOUTHWEST QUADRANT
                            020 NM NORTHWEST QUADRANT
   VECTOR TO 36 HR POSIT: 125 DEG/ 02 KTS
    ---
   36 HRS, VALID AT:
   061800Z --- 19.5N 60.6E
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
                            070 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   VECTOR TO 48 HR POSIT: 100 DEG/ 03 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   070600Z --- 19.4N 61.2E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
050900Z POSITION NEAR 20.4N 61.2E.
05OCT25. TROPICAL CYCLONE 02A (SHAKHTI), LOCATED APPROXIMATELY
146 NM EAST OF MASIRAH ISLAND, HAS TRACKED WEST-SOUTHWESTWARD AT
05 KNOTS OVER THE PAST SIX HOURS. MINIMUM CENTRAL PRESSURE AT 050600Z
IS 984 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 050600Z IS 18 FEET. NEXT
WARNINGS AT 051500Z, 052100Z, 060300Z AND 060900Z.//
NNNN





  1. WDIO31 PGTW 050900
  2. MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
  3. SUBJ/PROGNOSTIC REASONING FOR TROPICAL CYCLONE 02A (SHAKHTI) WARNING
  4. NR 010//
  5. RMKS/
  6. 1. FOR METEOROLOGISTS.
  7. 2. 6 HOUR SUMMARY AND ANALYSIS.

  8. SUMMARY:
  9.    INITIAL POSITION: 20.5N 61.4E
  10.    INITIAL INTENSITY: 65 KTS
  11.    GEOGRAPHIC REFERENCE: 146 NM EAST OF MASIRAH ISLAND
  12.    MOVEMENT PAST 6 HOURS: WEST-SOUTHWESTWARD AT 05 KTS
  13.    SIGNIFICANT WAVE HEIGHT: 18 FEET

  14. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
  15. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS PERSISTENT
  16. DEEP CONVECTION OFFSET TO THE SOUTH OF THE COMPACT LOW-LEVEL
  17. CIRCULATION CENTER (LLCC). THE POLEWARD OUTFLOW HAS WEAKENED,
  18. INDICATIVE OF THE EASTERLY DRY AIR ENTRAINMENT AND THE EAST-
  19. NORTHEASTERLY SHEAR. A 050216Z WSFM MICROWAVE IMAGE REVEALS THAT
  20. TROPICAL CYCLONE (TC) 02A HAS RETAINED ITS MICROWAVE EYE, DESPITE THE
  21. MARGINALLY UNFAVORABLE ENVIRONMENT AND OBFUSCATION OF THE LLCC BY THE
  22. CENTRAL DENSE OVERCAST. ANALYSIS INDICATES THAT THE ENVIRONMENT IS
  23. CHARACTERIZED BY MODERATE TO HIGH (20-25 KTS) VERTICAL WIND SHEAR,
  24. DRY AIR, AND UPWELLING ASSOCIATED WITH THE STORM'S STAGNATION. THE
  25. INITIAL
  26. POSITION IS PLACED WITH MEDIUM CONFIDENCE BASED ON EXTRAPOLATION
  27. FROM THE AFOREMENTIONED 050216Z WSFM MICROWAVE IMAGE AND A 050436Z
  28. METOP-B ASCAT PARTIAL PASS REVEALING THE LLCC. THE INITIAL
  29. INTENSITY OF 65 KTS IS ASSESSED WITH MEDIUM CONFIDENCE BASED ON THE
  30. 050436Z METOP-B ASCAT PARTIAL PASS, CORROBORATED BY THE OBJECTIVE
  31. INTENSITY AIDS AND AGENCY DVORAK FIXES LISTED BELOW.

  32. INITIAL WIND RADII BASIS: OBJECTIVE BEST TRACK AND THE 050436Z METOP-
  33. B ASCAT IMAGE.

  34. CURRENT STEERING MECHANISM: COMPETING STEERING ENVIRONMENT BETWEEN
  35. A SUBTROPICAL RIDGE (STR) POSITIONED OVER SAUDI ARABIA AND AN STR
  36. POSITIONED OVER THE EASTERN ARABIAN SEA

  37. AGENCY DVORAK AND AUTOMATED FIXES:
  38.    PGTW: T4.0 - 65 KTS
  39.    KNES: T4.5 - 77 KTS
  40.    DEMS: T3.5 - 55 KTS
  41.    CIMSS ADT: 57 KTS AT 050630Z
  42.    CIMSS AIDT: 68 KTS AT 050630Z
  43.    CIMSS D-PRINT: 57 KTS AT 050630Z

  44. FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: MARGINALLY
  45. UNFAVORABLE
  46.    VWS: 20-25 KTS
  47.    SST: 27-28 CELSIUS
  48.    OUTFLOW: MODERATE EQUATORWARD
  49.    OTHER FACTORS: DRY AIR ENTRAINMENT AND UPWELLING

  50. ANALYSIS CONFIDENCE:
  51.    INITIAL POSITION: MEDIUM
  52.    INITIAL INTENSITY: MEDIUM
  53.    INITIAL WIND RADII: MEDIUM

  54. 3. FORECAST REASONING.

  55. SIGNIFICANT FORECAST CHANGES: THERE ARE NO SIGNIFICANT CHANGES TO
  56. THE FORECAST FROM THE PREVIOUS WARNING.

  57. FORECAST DISCUSSION: TC 02A WILL CONTINUE ITS SLOW SOUTHWESTWARD
  58. TRACK FOR THE NEXT 24 HOURS AS IT REMAINS UNDER THE INFLUENCE OF
  59. THE SOUTHEASTERN PERIPHERY OF THE PRIMARY STEERING RIDGE OVER SAUDI
  60. ARABIA. AROUND TAU 24, 02A WILL TAKE AN EAST-SOUTHEASTWARD CURVE AS
  61. A DEEP-LAYER TROUGH BREAKS DOWN THE STR POSITIONED OVER THE EASTERN
  62. ARABIAN SEA. THE STR WILL EXTEND SOUTHWEST AND WEST, CAUSING 02A TO
  63. BRIEFLY STALL BEFORE RECURVING OVER THE NOW-DOMINANT STEERING
  64. RIDGE. 02A WILL TRACK EAST-SOUTHEASTWARD ALONG THE NORTHWESTERN
  65. PERIPHERY OF THE STR UNTIL THE END OF THE FORECAST PERIOD. 02A IS
  66. FORECAST TO STEADILY WEAKEN FROM HERE ON OUT DUE TO THE SIGNIFICANT
  67. DRY AIR ENTRAINMENT AND INCREASING WIND SHEAR. AS A RESULT OF THE
  68. STORM'S SLOW TRACK MOTION, COOLER WATER UPWELLING HAS ALSO HINDERED
  69. DEVELOPMENT AND WILL LIKELY HASTEN DISSIPATION. DISSIPATION IS
  70. FORECAST NO LATER THAN TAU 48.

  71. MODEL DISCUSSION: DETERMINISTIC TRACK MODELS ARE IN DECENT
  72. AGREEMENT ON A SOUTHWESTWARD TRACK THROUGH TAU 24 BUT HAVE VARYING
  73. TRACK SPEEDS. THOUGH MOST MODELS AGREE ON A SOUTHEASTWARD CURVE
  74. BEGINNING AFTER TAU 24, THE TRACK SPEED DIFFERENCES GREATLY IMPACT
  75. THE LOCATION AT WHICH 02A WILL TURN, LENDING UNCERTAINTY TO THE
  76. JTWC TRACK FORECAST.  OUTLIERS INCLUDE NAVGEM -- WHICH TRACKS 02A
  77. SOUTHWEST UNTIL TAU 48 BEFORE RECURVING, AND GFS -- WHICH IS THE
  78. ONLY MODEL PREDICTING A NORTHEASTERN CURVE. THE JTWC TRACK FORECAST
  79. IS PLACED SLIGHTLY EAST OF THE MULTI-MODEL CONSENSUS WITH MEDIUM
  80. CONFIDENCE. INTENSITY GUIDANCE IS IN STRONG AGREEMENT THROUGH
  81. TAU 48, WITH ALL MODELS PREDICTING A CONSISTENT WEAKENING TREND
  82. BEGINNING IMMINENTLY WITH DISSIPATION FORECAST WITHIN 48 HOURS. AS
  83. A RESULT, THE JTWC INTENSITY FORECAST IS PLACED WITH HIGH
  84. CONFIDENCE.

  85. FORECAST CONFIDENCE:
  86.    TRACK 00-72 HR: MEDIUM
  87.    INTENSITY 00-72 HR: HIGH//
  88. NNNN
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发表于 2025-10-5 16:45 | 显示全部楼层
全球热带气旋监测公报
预报:徐润杰、刘涛  签发:王海平  2025 年 10 月 05 日 18 时
“沙赫提”向西偏南方向移动

时        间:   5日14时(北京时,下同)

海        域:    北印度洋

命        名:    “沙赫提”,SHAKHTI

中心位置:    北纬20.8度,东经61.1度

强度等级:    强气旋风暴

最大风力:    10级,28米/秒,相当于我国的强热带风暴级

中心气压:    988百帕

参考位置:    距离阿曼马斯喀特东南方向约420公里

变化过程:    过去24小时,“沙赫提”强度维持

预报结论:   “沙赫提”将以每小时15公里左右的速度向西偏南方向移动,强度缓慢减弱



图3 卫星红外监测图像(北京时间2025年10月5日14时00分)

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本帖最后由 ygsj24 于 2025-10-6 06:10 编辑

WTIO31 PGTW 051500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 011//
RMKS/
1. TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 011   
   01 ACTIVE TROPICAL CYCLONE IN NORTHIO
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   051200Z --- NEAR 20.0N 60.6E
     MOVEMENT PAST SIX HOURS - 240 DEGREES AT 08 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
                            040 NM SOUTHEAST QUADRANT
                            040 NM SOUTHWEST QUADRANT
                            035 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
                            080 NM SOUTHEAST QUADRANT
                            080 NM SOUTHWEST QUADRANT
                            060 NM NORTHWEST QUADRANT
   REPEAT POSIT: 20.0N 60.6E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   060000Z --- 19.6N 60.0E
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 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 - 040 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            040 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 225 DEG/ 01 KTS
    ---
   24 HRS, VALID AT:
   061200Z --- 19.5N 59.9E
   MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT
                            030 NM SOUTHEAST QUADRANT
                            030 NM SOUTHWEST QUADRANT
                            020 NM NORTHWEST QUADRANT
   VECTOR TO 36 HR POSIT: 135 DEG/ 02 KTS
    ---
   36 HRS, VALID AT:
   070000Z --- 19.2N 60.2E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
    ---
REMARKS:
051500Z POSITION NEAR 19.9N 60.5E.
05OCT25. TROPICAL CYCLONE 02A (SHAKHTI), LOCATED APPROXIMATELY
104 NM EAST-SOUTHEAST OF MASIRAH ISLAND, HAS TRACKED WEST-
SOUTHWESTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. MINIMUM CENTRAL
PRESSURE AT 051200Z IS 984 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT
051200Z IS 18 FEET. NEXT WARNINGS AT 052100Z, 060300Z, 060900Z AND
061500Z.//
NNNN





  1. WDIO31 PGTW 051500
  2. MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
  3. SUBJ/PROGNOSTIC REASONING FOR TROPICAL CYCLONE 02A (SHAKHTI) WARNING
  4. NR 011//
  5. RMKS/
  6. 1. FOR METEOROLOGISTS.
  7. 2. 6 HOUR SUMMARY AND ANALYSIS.

  8. SUMMARY:
  9.    INITIAL POSITION: 20.0N 60.6E
  10.    INITIAL INTENSITY: 60 KTS
  11.    GEOGRAPHIC REFERENCE: 104 NM EAST-SOUTHEAST OF MASIRAH ISLAND
  12.    MOVEMENT PAST 6 HOURS: WEST-SOUTHWESTWARD AT 08 KTS
  13.    SIGNIFICANT WAVE HEIGHT: 18 FEET

  14. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
  15. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A COMPACT
  16. AND FULLY OBSCURED LOW LEVEL CIRCULATION CENTER (LLCC) WITH
  17. LOW-LEVEL CLOUD BANDS WRAPPING TIGHTLY INTO THE CENTER.
  18. ANIMATED MSI ALSO REVEALS THAT TROPICAL CYCLONE (TC) 02A HAS
  19. MAINTAINED ITS VISUAL APPEARANCE OVER THE PAST 6 HOURS. HOWEVER, A
  20. 051327Z WSFM MICROWAVE IMAGE REVEALS THAT THE INTERNAL STRUCTURE
  21. HAS DEGRADED SHOWING A BREAK IN THE MICROWAVE EYE IN THE NORTHERN
  22. SEMICIRCLE. 02A REMAINS IN AN UNFAVORABLE ENVIRONMENT CHARACTERIZED
  23. BY HIGH (25-30 KTS) VERTICAL WIND SHEAR AND SIGNIFICANT DRY AIR
  24. ENTRAINMENT. THE INITIAL POSITION IS PLACED WITH HIGH CONFIDENCE
  25. BASED ON EXTRAPOLATION TO THE PREVIOUSLY MENTIONED 051327Z WSFM
  26. MICROWAVE IMAGE. THE INITIAL INTENSITY OF 60 KTS IS ASSESSED WITH
  27. MEDIUM CONFIDENCE BASED ON OBJECTIVE INTENSITY ESTIMATES AND AGENCY
  28. DVORAK FIXES LISTED BELOW.

  29. INITIAL WIND RADII BASIS: PERSISTENCE

  30. CURRENT STEERING MECHANISM: COMPETING STEERING ENVIRONMENT BETWEEN
  31. A SUBTROPICAL RIDGE (STR) POSITIONED OVER SAUDI ARABIA AND AN STR
  32. POSITIONED OVER THE EASTERN ARABIAN SEA

  33. AGENCY DVORAK AND AUTOMATED FIXES:
  34.    PGTW: T4.0 - 65 KTS
  35.    KNES: T4.5 - 77 KTS
  36.    DEMS: T3.5 - 55 KTS
  37.    CIMSS SATCON: 59 KTS AT 051200Z
  38.    CIMSS ADT: 51 KTS AT 051200Z
  39.    CIMSS AIDT: 61 KTS AT 051200Z
  40.    CIMSS D-MINT: 43 KTS AT 051130Z
  41.    CIMSS D-PRINT: 57 KTS AT 051200Z

  42. FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: UNFAVORABLE
  43.    VWS: 25-30 KTS
  44.    SST: 27-28 CELSIUS
  45.    OUTFLOW: MODERATE POLEWARD
  46.    OTHER FACTORS: DRY AIR ENTRAINMENT

  47. ANALYSIS CONFIDENCE:
  48.    INITIAL POSITION: HIGH
  49.    INITIAL INTENSITY: HIGH
  50.    INITIAL WIND RADII: LOW

  51. 3. FORECAST REASONING.

  52. SIGNIFICANT FORECAST CHANGES: THERE ARE NO SIGNIFICANT CHANGES TO
  53. THE FORECAST FROM THE PREVIOUS WARNING.

  54. FORECAST DISCUSSION: TC 02A WILL CONTINUE ITS SLOW SOUTHWESTWARD
  55. TRACK FOR THE NEXT 12 HOURS AS IT REMAINS UNDER THE INFLUENCE OF
  56. THE SOUTHEASTERN PERIPHERY OF THE PRIMARY STEERING RIDGE OVER SAUDI
  57. ARABIA. BETWEEN TAUS 12-24, 02A WILL BECOME QUASI-STATIONARY AS THE
  58. UPPER-LEVEL TROUGH WEAKENS THE STR POSITIONED OVER THE EASTERN
  59. ARABIAN SEA, CREATING A MORE CONFUSING STEERING ENVIRONMENT. AFTER
  60. TAU 24, 02A WILL TRACK SOUTHEAST ALONG THE NORTHWESTERN PERIPHERY
  61. OF THE STR. 02A IS FORECAST TO RAPIDLY WEAKEN THROUGH THE END OF THE
  62. FORECAST PERIOD DUE TO THE SIGNIFICANT DRY AIR ENTRAINMENT AND HIGH
  63. VERTICAL WIND SHEAR. UPWELLING DUE TO THE STORM'S QUASI-STATIONARY
  64. MOVEMENT IS ALSO EXPECTED TO EXPEDITE DISSIPATION. DISSIPATION IS
  65. FORECAST TO OCCUR NO LATER THAN TAU 36.

  66. MODEL DISCUSSION: DETERMINISTIC TRACK MODELS ARE IN DECENT
  67. AGREEMENT ON A SOUTHWESTWARD TRACK THROUGH TAU 12 WITH THE
  68. SOUTHEASTWARD TURN COMMENCING AT AROUND TAU 24. THE VARYING MODEL
  69. TRACK SPEEDS IMPACT THE LOCATION AT WHICH 02A WILL TURN SOUTHEAST,
  70. INTRODUCING UNCERTAINTY TO THE JTWC TRACK FORECAST. MAJOR OUTLIERS
  71. ARE NAVGEM -- WHICH TRACKS 02A SOUTH-SOUTHWEST UNTIL TAU 24, AND
  72. GFS -- THE ONLY MODEL FAILING TO PREDICT A RECURVE PRIOR TO
  73. DISSIPATION. THE JTWC TRACK FORECAST IS PLACED IN AGREEMENT WITH
  74. THE MULTI-MODEL CONSENSUS WITH MEDIUM CONFIDENCE. INTENSITY
  75. GUIDANCE IS IN STRONG AGREEMENT THROUGH TAU 36, WITH ALL MODELS
  76. PREDICTING A CONSISTENT WEAKENING TREND WITH DISSIPATION IN 36 HOURS.
  77. AS A RESULT, THE JTWC INTENSITY FORECAST IS PLACED WITH HIGH
  78. CONFIDENCE.

  79. FORECAST CONFIDENCE:
  80.    TRACK 00-72 HR: MEDIUM
  81.    INTENSITY 00-72 HR: HIGH//
  82. NNNN
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