Impressive Surface Observations in Typhoons (1980 Onwards)

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doomhaMwx
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#61 Postby doomhaMwx » Sat Nov 25, 2023 11:06 am

Some wave glider observations...

DANAS (2013): https://agupubs.onlinelibrary.wiley.com ... 16GL071115
Minimum pressure of 930 mb recorded in the eye.
The Wave Glider made its closest approach to Danas at around 1230 JST 7 October 2013 (Figure 1a). It is estimated that the Wave Glider was positioned ∼15 km east of the typhoon center, based on information provided by the RSMC, Tokyo. The monitored atmospheric pressure quickly dropped to 930 hPa. This value is close to the lowest pressure estimated by the RSMC (935 hPa). Electricity generated by the solar power panels was nearly zero most of the time from 6 to 8 October 2013, implying that the Wave Glider was under heavy cloud cover. During this darkness, power generation (60 min mean) spiked only briefly from 1138 to 1238 JST 7 October 2013, suggesting that for that brief period, the glider experienced little or no cloud cover and implying that the eye of Danas passed over the Wave Glider.

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HINNAMNOR (2022): https://www.jstage.jst.go.jp/article/so ... 3-016/_pdf
Japanese researchers used wave gliders to intercept Hinnamnor as it passed south of Okinawa. One of the gliders recorded an MSLP of 942 mb in the eye on August 31 ~22:00 JST (~13Z), which was between its first and second peaks.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#62 Postby doomhaMwx » Thu Dec 07, 2023 11:03 am

doomhaMwx wrote: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

https://i.imgur.com/847bRsu.png

doomhaMwx wrote:
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).

https://i.imgur.com/IbieJBP.png
https://i.imgur.com/wiIByN2.png

Just a bit of an update:
Got the raw radar data just before landfall, so I took a closer look at this. Radar indeed shows that the JMA (and PAGASA) positions are more accurate compared to JTWC. Casiguran (WMO 98336) also likely entered the northern part of the eye, while Baler (WMO 98334) was likely near the edge of the eye/eyewall — estimating it based on track and the size of the eye.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#63 Postby doomhaMwx » Tue Jan 09, 2024 9:49 pm

LAN (2017)

936.8 mb SLP recorded by drifting buoy "2101577" in the eye on 10-21-2017 02:33Z.

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