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JMA 已發佈熱帶氣旋最終報文，成為海鷗的機會大幅降低。 |
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入夜後,看駛流圖,天氣形勢有大變化麽？原先在日間一直維持的華南高壓單體,竟於入夜後火速瓦解,令熱低的引導氣流由原本的東南西北向,改變為現在的南北向,這引導流不知會否持續,若成真,那熱低將更靠近華南,令香港3號風球機會大增,一切宜開始密切留意。 至於強度方面,熱低周圍風切減弱了,但仍看來偏強,這會抑制風暴之加強整合,故本人仍維持這風暴充其量只加強至熱帶風暴75km/h之預測。 |
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熱 帶 氣 旋 警 告 香港天文台在2014年09月07日09時40分發出之天氣報告 一 號 戒 備 信 號 在 上 午 9 時 40 分 發 出 。 |
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HKO 已升為熱帶低氣壓 位 於 南 海 北 部 的 低 壓 區 已 增 強 為 熱 帶 低 氣 壓 ， 與 其 相 關 的 驟 雨 正 逐 漸 移 近 廣 東 沿 岸 地 區 。 在 上 午 八 時 ， 該 熱 帶 低 氣 壓 集 結 在 海 口 之 東 南 偏 東 約 440 公 里 ， 預 料 向 西 北 移 動 ， 時 速 約 16 公 里 ， 大 致 移 向 廣 東 西 部 至 海 南 島 一 帶 。 |
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TCFA ! WTPN22 PGTW 060730 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE FORMATION ALERT// REF/A/JOINT TYPHOON WRNCEN PEARL HARBOR HI/060151Z SEP 14// AMPN/REF A IS TROPICAL CYCLONE FORMATION ALERT (WTPN21 PGTW 060200)// RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 175 NM EITHER SIDE OF A LINE FROM 16.2N 118.0E TO 19.0N 112.3E 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 15 TO 20 KNOTS. METSAT IMAGERY AT 060600Z INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 16.5N 116.6E. THE SYSTEM IS MOVING NORTH-NORTHWESTWARD AT 11 KNOTS. 2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 15.4N 116.9E, IS NOW LOCATED NEAR 16.5N 116.6E, APPROXIMATELY 380 NM SOUTH- SOUTHEAST OF HONG KONG. ANIMATED MSI DEPICTS PERSISTENT FLARING DEEP CONVECTION ASSOCIATED WITH A CONSOLIDATING LOW-LEVEL CIRCULATION CENTER (LLCC). A 060140Z METOP-B MICROWAVE IMAGE REVEALS FRAGMENTED CONVECTIVE BANDING WRAPPING INTO THE CENTER. A 060140Z ASCAT PASS SHOWS AN ELONGATED 10 TO 15 KNOT CIRCULATION WITH 15 TO 20 KNOTS OVER THE NORTHERN SEMI-CIRCLE. UPPER-LEVEL ANALYSIS INDICATES THE SYSTEM IS NOW LOCATED IN A FAVORABLE ENVIRONMENT WITH LOW TO MODERATE (05 TO 15 KNOT) VWS AND GOOD EQUATORWARD OUTFLOW. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1003 MB. DUE TO PERSISTENT CONVECTION AND INCREASED CONSOLIDATION, THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS HIGH. 3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY 070730Z. 4. SEE REF A FOR DETAILS ON A TROPICAL CYCLONE FORMATION ALERT LOCATED NEAR 22.5N 127.3E// NNNN |
組圖打開中，請稍候......