WPAC: MANGKHUT - Post-Tropical

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Re: WPAC: MANGKHUT - Post-Tropical

#901 Postby NotoSans » Fri Sep 21, 2018 12:53 pm

In terms of wind speed, I’m quite sure that Haiyan was stronger at its first landfall over Samar island (if that counts as a landfall), and possibly at the second landfall over Leyte island as well. In terms of pressure, Mangkhut was more likely to be deeper due to it having a larger circulation and concentric eyewall structure before landfall, as well as a lower ambient pressure due to a less stronger ridge. For Haiyan, I’m quite sure pressure had risen to above 900mb by the time of the second landfall.
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Re: WPAC: MANGKHUT - Post-Tropical

#902 Postby Imran_doomhaMwx » Sat Oct 06, 2018 12:35 am

From HKO's monthly report:
https://www.hko.gov.hk/wxinfo/pastwx/mw ... 201809.htm
September 2018 was marked by the ferocious strike of severe typhoon Mangkhut which necessitated the issuance of the No. 10 Hurricane Signal in Hong Kong for 10 hours on 16 September. This is the second longest duration of No. 10 Hurricane Signal in Hong Kong since 1946, just next to the record of 11 hours set by Typhoon York in 1999. Mainly attributing to the rainfall brought by Mangkhut, the month was wetter than usual.

Super Typhoon Mangkhut tracked northwestwards on 14 September and made landfall over Luzon in the small hours of 15 September. After crossing the northern part of Luzon, Mangkhut continued to track northwestwards quickly across the northern part of the South China Sea on 15 September, edging towards the coast of Guangdong. Mangkhut weakened into a severe typhoon on the morning of 16 September and skirted about 100 km south-southwest of Hong Kong in the afternoon. It made landfall over the vicinity of Taishan of Guangdong before dusk and moved into western part of Guangdong. Mangkhut degenerated into an area of low pressure over Guangxi the next night.

The storm surge induced by Mangkhut resulted in unusually high water level in many parts of Hong Kong. The water levels at Quarry Bay of the Victoria Harbour rose to a maximum of 3.88 metres above Chart Datum on the afternoon of 16 September 2018, the second highest since 1954 and only lower than the record high of 3.96 metres above Chart Datum set by Super Typhoon Wanda in 1962. Moreover, the maximum storm surge (above astronomical tide) induced by Mangkhut at Quarry Bay was 2.35 metres which was the highest on record, breaking the previous record of 1.77 metres kept by Wanda in 1962."

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