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天篷大元帥|2021-7-18 13:18
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聯合颱風警報中心升格熱帶風暴首報資料
原文:
WDPN31 PGTW 180300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 09W (IN-FA) WARNING NR
008//
RMKS/
1. FOR METEOROLOGISTS.
2. 6 HOUR SUMMARY AND ANALYSIS.
SUMMARY:
INITIAL POSITION: 22.9N 132.3E
INITIAL INTENSITY: 35 KTS
GEOGRAPHIC REFERENCE: 327 NM SOUTHEAST OF KADENA AB
MOVEMENT PAST 6 HOURS: NORTH-NORTHWESTWARD AT 07 KTS
SIGNIFICANT WAVE HEIGHT: 19 FEET
SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A BROAD,
ELONGATED LOW-LEVEL CIRCULATION CENTER (LLCC) OBSCURED BY DEEP
FLARING CONVECTION. A 172310Z GMI 89GHZ MICROWAVE IMAGE DEPICTS
SHALLOW BANDING WRAPPING INTO AN ELONGATED LOW LEVEL CIRCULATION
WITH A BROAD SWATH OF CONVECTION TO THE EAST. THE INITIAL POSITION IS
PLACED WITH HIGH CONFIDENCE BASED ON A 180029Z ASCAT-B IMAGE
SHOWING A BROAD SWATH 30-35 KT WINDS IN THE EASTERN SEMICIRCLE AND
25 KT WINDS WRAPPING INTO THE WESTERN SEMICIRCLE. THE INITIAL
INTENSITY OF 35 KTS IS ASSESSED WITH HIGH CONFIDENCE BASED ON THE
ASCAT-B IMAGE AND DVORAK ESTIMATES FROM PGTW, RJTD AND KNES.
ENVIRONMENTAL ANALYSIS INDICATES MARGINALLY FAVORABLE CONDITIONS
WITH WEAKENING UPPER-LEVEL WESTERLIES OFFSET BY ROBUST EQUATORWARD
OUTFLOW AND WARM SST VALUES.
INITIAL WIND RADII BASIS: SCATTEROMETER DATA
CURRENT STEERING MECHANISM: SUBTROPICAL RIDGE (STR) OVER THE
NORTHEASTERN AND EASTERN PERIPHERY OF THE SYSTEM.
AGENCY DVORAK AND AUTOMATED FIXES:
PGTW: T2.0 - 30 KTS
RJTD: T2.0 - 30 KTS
KNES: T2.5 - 35 KTS
CIMSS ADT: 34 KTS AT 172040Z
FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: MARGINALLY FAVORABLE
VWS: 15-20 KTS
SST: 28-29 CELSIUS
OUTFLOW: STRONG EQUATORWARD
ANALYSIS CONFIDENCE:
INITIAL POSITION: HIGH
INITIAL INTENSITY: HIGH
INITIAL WIND RADII: HIGH
3. FORECAST REASONING.
SIGNIFICANT FORECAST CHANGES: POSITIONING OF FORECAST TRACK SHIFTED
SOUTHWARD AFTER TAU 96.
FORECAST DISCUSSION: TS 09W IS TRACKING NORTHWESTWARD ALONG THE
PERIPHERY OF THE STR TO THE NORTH BUT WILL BEGIN GRADUALLY TURNING
WEST-NORTHWESTWARD AFTER TAU 24 AS THE STR BEGINS TO SHIFT
WESTWARD. AT THE SAME TIME, THE SYSTEM SHOULD BEGIN TO SLOWLY
INTENSIFY AS ENVIRONMENTAL CONDITIONS GRADUALLY IMPROVE WITH
CONVERGENCE ALOFT WEAKENING, ALLOWING THE SYSTEM TO DEVELOP MORE
ROBUST POLEWARD OUTFLOW. AFTER TAU 72, TS 09W WILL TURN WESTWARD AS
THE STR TO THE NORTH CONTINUES TO BUILD. AS IMPROVED ENVIRONMENTAL
CONDITIONS PERSIST, TS 09W WILL STEADILY INCREASE IN INTENSITY
THROUGHOUT THE REMAINDER OF THE FORECAST WITH A PEAK INTENSITY OF
85 KNOTS ANTICIPATED BY TAU 120. OF NOTE, THE FORECAST TRACK HAS
SHIFTED SOUTHWARD AFTER TAU 96 DUE TO MODEL GUIDANCE SHOWING THE
STR TO THE NORTH BEGINNING TO EXTEND TOWARDS THE SOUTHWEST.
MODEL DISCUSSION: THERE IS MEDIUM CONFIDENCE ON THE NUMERICAL MODEL
GUIDANCE IN THE FORECAST TRACK UP TO TAU 72, AT WHICH POINT THE
MODELS BEGIN TO BIFURCATE, WITH NVGM AND UKMET TURNING
NORTHWESTWARD AND GFS AND ECMWF TURNING SOUTHWESTWARD. THIS LENDS
LOW CONFIDENCE TO THE REMAINDER OF THE FORECAST TRACK BEYOND TAU
72.
FORECAST CONFIDENCE:
TRACK 0 - 72 HR: MEDIUM
TRACK 72-120 HR: LOW
INTENSITY 0 - 72 HR: MEDIUM
INTENSITY 72-120 HR: LOW//
NNNN 機器翻譯(翻譯拙劣僅供參考)WDPN31 PGTW 180300
MSGID/GENADMIN/聯合颱風WRNCEN珍珠港嗨//
熱帶風暴 09W (IN-FA) 警告 NR 的主題/預測推理
008//
RMKS/
1. 對於氣象學家。
2. 6 小時總結和分析。
概括:
初始位置:22.9N 132.3E
初始強度:35 KTS
地理參考:嘉手納 AB 東南 327 海裡
過去 6 小時的移動:在 07 KTS 時向西北-西北方向移動
顯著波浪高度:19 英尺
衛星分析、初始位置和強度討論:
動畫多光譜衛星圖像 (MSI) 描繪了廣泛的、
被深部遮擋的細長的低層循環中心 (LLCC)
擴口對流。172310Z GMI 89GHZ 微波圖像描述
淺帶包裹成細長的低液位循環
向東有大範圍對流。初始位置是
基於 180029Z ASCAT-B 圖像充滿信心
在東半圓顯示出 30-35 KT 的大範圍風和
25 KT 風捲入西半圓。最初的
35 KTS 的強度根據
來自 PGTW、RJTD 和 KNES 的 ASCAT-B 圖像和 DVORAK 估計。
環境分析表明條件有利
強勁的赤道方向抵消了上層西風的減弱
流出和溫暖的 SST 值。
初始風半徑基礎:散射計數據
當前的轉向機構:副熱帶脊 (STR)
系統的東北和東部外圍。
機構 DVORAK 和自動修復:
PGTW:T2.0 - 30 KTS
RJTD:T2.0 - 30 KTS
膝關節:T2.5 - 35 KTS
CIMSS ADT:172040Z 34 KTS
預測者對當前環境的評估:略微有利
VWS:15-20 KTS
SST:28-29 攝氏度
流出:強赤道
分析信心:
初始位置:高
初始強度:高
初始風半徑:高
3. 預測推理。
顯著的預測變化:預測軌道的位置轉移
在 TAU 96 之後向南。
預測討論:TS 09W 正在沿西北方向追踪
STR的外圍向北但將開始逐漸轉向
在 TAU 24 之後,隨著 STR 開始轉移,西-西北向
向西。同時,系統應該開始慢慢地
隨著環境條件的逐漸改善而加劇
收斂性逐漸減弱,允許系統發展更多
強勁的極地流出。在 TAU 72 之後,TS 09W 將轉向西
北部的 STR 繼續建設。隨著環境的改善
條件持續,TS 09W 將穩步增加強度
在預測的剩餘時間內,峰值強度為
TAU 預期的 85 節 120. 注意,預測軌道有
由於模型指導顯示 TAU 96 之後向南移動
STR向北開始向西南延伸。
模型討論:對數值模型有中等信心
TAU 72 的預測跟踪指南,此時
隨著 NVGM 和 UKMET 的轉變,模型開始分叉
西北和 GFS 和 ECMWF 轉向西南。這個貸款
對 TAU 之外的其他預測軌跡缺乏信心
72.
預測信心:
跟踪 0 - 72 小時:中等
跟踪 72-120 小時:低
強度 0 - 72 小時:中等
強度 72-120 小時:低//
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