Impressive Surface Observations in Typhoons (1980 Onwards)

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#41 Postby 1900hurricane » Wed May 31, 2023 6:15 pm

Anyone have or know of any obs associated with Meranti's landfall in China?
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#42 Postby mrbagyo » Thu Jun 01, 2023 8:54 am

1900hurricane wrote:Anyone have or know of any obs associated with Meranti's landfall in China?


saw this illustration from the Tybbs forum

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#43 Postby doomhaMwx » Thu Jun 01, 2023 6:03 pm

^ Speaking of Meranti, here are the actual obs from PAGASA's stations in Batanes. The last usable data from Itbayat shows an SLP of 927.9 mb on 09/13 16:30Z. According to PAGASA, the eye was ~10km from the station (30 mins before landfall) at that time, and the pressure was still rapidly dropping. Basco station, which was at least 25km from the eye, recorded 927.3 mb MSLP.

The aforementioned pressures are 5-8mb lower than what was initially indicated in the TC passage report submitted by PAGASA.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#44 Postby 1900hurricane » Thu Jun 01, 2023 7:10 pm

Interesting about the Itbayat obs, and the Basco pressure is also pretty crazy. Basco has shown up a few times in this thread, and the Meranti pressure is deeper than all the others except Usagi '13 despite Meranti not making a landfall/passage there.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#45 Postby 1900hurricane » Thu Jun 01, 2023 7:11 pm

mrbagyo wrote:
1900hurricane wrote:Anyone have or know of any obs associated with Meranti's landfall in China?


saw this illustration from the Tybbs forum

https://www.tybbs.org.cn/data/attachment/forum/pw/1701/thread/85_53653_b6112bc5e0d95e8.jpg

This and the other obs you send me was pretty much exactly what I was looking for, thank you!

This thread is an absolute gold mine.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#46 Postby doomhaMwx » Thu Jun 01, 2023 8:55 pm

RAMMASUN (2014)

Wenchang buoy in the eyewall recorded a min pressure of 922mb, with max sustained winds of 55.1 m/s (107kts) and gust of 75.1 m/s (146kts). This is the most impressive surface obs for Rammasun that I'm aware of outside the 899.2 mb recorded on an island off Hainan.

(Credits to Twitter user @yangyubin1998 for this data).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#47 Postby doomhaMwx » Fri Jun 02, 2023 5:08 pm

JELAWAT (2012)

On 09/27/2012, 19Z, a buoy deployed by CWB east of Taiwan recorded an impressive SLP of 934.9 mb in the eye of STY Jelawat, which was gradually weakening after peaking as a category 5 a couple of days earlier. The buoy's distance from the actual center of the eye was 7.4 km.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#48 Postby TropicalAnalystwx13 » Sat Jun 03, 2023 11:39 pm

I am aware of sub-960mb measurements in the Philippines for Rammasun. Is there a link to the actual station data for this? The same question goes for the 899mb observation station.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#49 Postby mrbagyo » Sun Jun 04, 2023 1:45 am

TropicalAnalystwx13 wrote:I am aware of sub-960mb measurements in the Philippines for Rammasun. Is there a link to the actual station data for this? The same question goes for the 899mb observation station.



953.5 hPa station pressure is approx. 955 hPa SLP
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#50 Postby doomhaMwx » Fri Jun 16, 2023 6:25 pm

KOPPU (2015)

942.5 mb MSLP and 216kph (116kts) wind speed observed at Baler, about 100km south of the landfall point (Casiguran). The station in Casiguran recorded a wind speed of 252kph (136kts), but weird that no pressure is mentioned, even in other documents I came across.
https://pubfiles.pagasa.dost.gov.ph/pre ... Events.pdf

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#51 Postby 1900hurricane » Sat Jun 17, 2023 9:00 am

As someone only coarsely familiar with Philippine geography, where was Baler and Casiguran in reference to the track/center/landfall?
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#52 Postby doomhaMwx » Sat Jun 17, 2023 12:23 pm

1900hurricane wrote:As someone only coarsely familiar with Philippine geography, where was Baler and Casiguran in reference to the track/center/landfall?


Casiguran station coordinates: 16.265428N, 122.128814E
Baler station coordinates: 15.749367N, 121.632047E

I'm just realizing now that there's quite a significant discrepancy between the JTWC (1st image) and JMA (2nd image) center positions at the time of landfall. JTWC is notably more south than JMA (and thus, closer to Baler), but looking at the radar image, I would say that JMA is on point (it's also similar to PAGASA).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#53 Postby doomhaMwx » Sat Jun 17, 2023 6:21 pm

LUPIT (2009)

A couple of buoys recorded some interesting data as Lupit was weakening in the Philippine Sea.
https://tdr.lib.ntu.edu.tw/handle/123456789/63599

Buoy A1 (10/20 ~18Z): 941.9 mb MSLP in the eye with max wind speed of 59.2 m/s (115kts).
- This was ~48hrs after its category 5 peak.
- JTWC and JMA's respective final estimate for that time is only 85kts/959mb and 75kts/960mb!
Buoy A3 (10/21): 954.6 mb and 46.1 m/s (90kts) in the eyewall.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#54 Postby doomhaMwx » Sat Jul 08, 2023 10:42 am

MARIA (2018)

On July 8 at 13Z, Okinotorishima recorded sustained winds of 51.1 m/s (99kts) with 937.2 mb pressure at 26m ASL (SLP=940mb) in the innermost part of Maria's eyewall when it was at category 5 intensity.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#55 Postby mrbagyo » Sat Jul 22, 2023 9:04 am

Minimum pressure of 942.3 hPa with 11 mps wind (later corrected by Zhanjiang Meteorological Observatory to 938.9 hPa) was recorded during the landfall of Typhoon Sally (CMA code number 9615) on September 9, 1996.

I wonder how low the mslp was when it hit Fuga Island in Northern Philippines when it was at its Category 5 peak intensity.

https://www.tybbs.org.cn/forum.php?mod=viewthread&tid=68285
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#56 Postby doomhaMwx » Thu Aug 03, 2023 1:42 am

DOKSURI (2023)

930.9 mb in the eye recorded by a buoy in the Taiwan Strait. Max 10-min sustained wind was 49 m/s (95kts) with gusts up to 61.3 m/s (119kts).

 https://twitter.com/yangyubin1998/status/1684614873458888704



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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#57 Postby doomhaMwx » Sat Nov 25, 2023 2:07 am

KOINU (2023):

Record-high winds for Taiwan.
Orchid Island recorded Taiwan's fastest-ever wind speeds since records began as Typhoon Koinu battered the southern part of the country overnight Wednesday, according to the Central Weather Administration (CWA).

At 9:40 p.m. Wednesday, the island measured sustained winds of 198.7 kph, followed by a gust at 9:53 p.m. that reached 342.7 kph, both setting all-time highs since Taiwan began keeping records of wind speeds in 1897, Huang Chia-mei (黃嘉美), head of the CWA's Taitung Weather Station, said Thursday.

https://focustaiwan.tw/society/202310050003

MSLP of 942.7 mb recorded by Lanyu buoy in the eye (another source says 939 mb from a land station).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#58 Postby doomhaMwx » Sat Nov 25, 2023 2:58 am

AGNES (1984)

PAGASA Guiuan recorded a min station pressure of 925mb at 60m elev (equivalent to ~930mb MSLP) with a max gust of 60 m/s (117kt).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#59 Postby Hayabusa » Sat Nov 25, 2023 3:12 am

doomhaMwx wrote:AGNES (1984)

PAGASA Guiuan recorded a min station pressure of 925mb at 60m elev (equivalent to ~930mb MSLP) with a max gust of 60 m/s (117kt).

https://i.imgur.com/b3B5NOm.png
https://i.imgur.com/zAT7Cxv.png
https://i.imgur.com/XxXNtPh.png

Guiuan's current altitude correction for pressure is +6.8 mb, so the MSLP for Agnes (if they had been using +6.8 as correction back in 1984) would be 931.8 mb, and for Haiyan would be 916.8 mb
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#60 Postby doomhaMwx » Sat Nov 25, 2023 7:59 am

Hayabusa wrote:
doomhaMwx wrote:AGNES (1984)

PAGASA Guiuan recorded a min station pressure of 925mb at 60m elev (equivalent to ~930mb MSLP) with a max gust of 60 m/s (117kt).

https://i.imgur.com/b3B5NOm.png
https://i.imgur.com/zAT7Cxv.png
https://i.imgur.com/XxXNtPh.png

Guiuan's current altitude correction for pressure is +6.8 mb, so the MSLP for Agnes (if they had been using +6.8 as correction back in 1984) would be 931.8 mb, and for Haiyan would be 916.8 mb

Yup, there's also an unverified 914.8 mb SLP for Haiyan.

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https://www.researchgate.net/figure/SLP ... _321763475
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