Impressive Surface Observations in Typhoons (1980 Onwards)

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#21 Postby Foxfires » Thu Mar 02, 2023 5:42 am



Matches up with the 905-910mb estimate from a 921.7mb reading on Saipan.

"Lander was on Saipan during the passage of the typhoon and set up a rain gauge and a barometer at his location in San Vicente. All official ground-based instrumentation failed on Tinian and Saipan as the winds surged well above 100mph. The minimum pressure in San Vicente dropped to 921.7 millibars (mb), according to Lander’s findings.

After necessary adjustments, the pressure was used to estimate the minimum central surface pressure of Yutu, which was found to be somewhere in the range of 905-910 mb. His rain gauge recorded about 10 inches of rainfall during the storm, which was used to supplement the 2.66 inches of rainfall recorded up to midnight at the Francisco C. Ada/Saipan International Airport."
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#22 Postby Monisae » Thu Mar 02, 2023 7:53 pm

Imran_doomhaMwx wrote:LINGLING (2019)

927.7 mb MSLP recorded by an oil platform in the East China Sea.
https://twitter.com/squirtleinhk/status/1169841446066642944?t=y3FK8l9yLD99RyjJeZ1QLw&s=19

927.7mb is the lowest slp observed by hour,the lowest mslp recorded is 923.0mb at 0143z
https://www.tybbs.org.cn/forum.php?mod=viewthread&tid=83795
2019 Lekima 928.8mb, recorded by an AWS in Taizhou
2022 Hinnamnor 926.4mb ,recorded by a platform in the East China Sea
2006 Saomai 929.1mb at 08z(hourly observation),recorded by a station in the East China Sea.MSLP of 941.3mb is recorded in the eye of Saomai at 0859z by an AWS in Cangnan
2013 Usagi station pressure of 932.5mb(5m ASL),recorded by an AWS in Shanwei
Zhe graph shows observation at another AWS (station pressure of 931.3mb and 30m ASL)
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Last edited by Monisae on Fri Mar 03, 2023 3:12 am, edited 1 time in total.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#23 Postby Foxfires » Thu Mar 02, 2023 9:03 pm

937mb recorded by Andersen Air Force Base in Typhoon Pongsona 2002

"As for pressure, the minimum SLP readings across Guam ranged from 959 mb at the Naval Station on the west-central side of the island, 940 mb at the WFO at the airport in the central section of Guam, and 937 mb at Andersen AFB on the northeastern side of the island. Andersen AFB was in Pongsona's eye for over 1.5 hrs while the WFO never entered the eye. Since the centre of the eye passed about 8 nm east-northeast of the AFB, a minimum CP of 935 mb is reasonable and is being used as the CP of the cyclone at its closest approach to Guam."

A report on Pongsona states 935mb but it's not stated as a directly measured pressure so it's probably an estimate/extrapolation like the 935mb above.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#24 Postby doomhaMwx » Sat Mar 18, 2023 5:33 pm

BABS (1998)

PAGASA Virac measured a max gust of 287kph (155kts) in the eyewall and MSLP of 927.9 mb in the eye of STY Babs. The station was actually able to send a synop report indicating 929.8 mb SLP before losing communication.
Fun fact: JMA only gave 85kt(10-min)/940mb in the best track!

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#25 Postby doomhaMwx » Mon Mar 20, 2023 6:52 am

PAKA (1997)

Looks like the lowest pressure measured in Guam was just in the low-950s, but I find the wind observations very impressive.
https://www.aoml.noaa.gov/hrd/project98/sh_proj1.html

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#26 Postby Foxfires » Tue Mar 21, 2023 3:50 am

Imran_doomhaMwx wrote:PAKA (1997)

Looks like the lowest pressure measured in Guam was just in the low-950s, but I find the wind observations very impressive.
https://www.aoml.noaa.gov/hrd/project98/sh_proj1.html

https://i.imgur.com/lYOfu7E.png
https://www.aoml.noaa.gov/hrd/project98/pakapix/figC_1.gif
https://www.aoml.noaa.gov/hrd/project98/pakapix/figC_2.gif


According to the JTWC's 1997 ATCR the lowest pressure recorded in Paka on Guam was 948mb at Anderson Air Force Base. Still not sub-940mb, but I just thought I'd let you know.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#27 Postby doomhaMwx » Fri Mar 24, 2023 10:03 am

DURIAN (2006)

Virac radar station recorded an MSLP of 934.6 mb and a max gust of 320kph (173kts; 89m/s) (233m elevation). This gust remains a national record in the Philippines to this day (Haiyan, Meranti, or Goni would've probably set a new record though if the stations where they made landfall survived long enough).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#28 Postby mrbagyo » Sun Mar 26, 2023 12:36 am

doomhaMwx wrote:DURIAN (2006)

Virac radar station recorded an MSLP of 934.6 mb and a max gust of 320kph (173kts; 89m/s) (233m elevation). This gust remains a national record in the Philippines to this day (Haiyan, Meranti, or Goni would've probably set a new record though if the stations where they made landfall survived long enough).

https://i.imgur.com/vLWnHKL.png
https://i.imgur.com/dHQhY1e.jpg


Goni at least snatched Virac's pressure record.
Radar station is actually situated in the municipality of Bato
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#29 Postby doomhaMwx » Fri Apr 07, 2023 5:58 pm

ANGELA (1995)

When STY Angela directly hit Daet City, PAGASA recorded an impressive MSLP of 925.9 mb despite the storm already taking significant toll from prior land interaction, possibly supporting the sub-900mb central pressure estimates at peak. A 69m/s (134kt) gust was also measured.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#30 Postby 1900hurricane » Mon Apr 10, 2023 3:52 pm

I realize it is just before the base period, but does anyone know of any land obs from Super Typhoon Rita '78?
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#31 Postby doomhaMwx » Fri Apr 14, 2023 7:29 am

1900hurricane wrote:I realize it is just before the base period, but does anyone know of any land obs from Super Typhoon Rita '78?

HKO's 1978 TC report mentions 50kt winds at Baler station (WMO: 98333) and a 971.5 mb MSLP at Infanta station (98434).

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I checked the 3-hourly synop data from Infanta station on 10/26/1978, and the time of the min pressure should be around 18Z (972.8 mb SLP was reported at that time).

Some additional SLP obs on 10/26 taken from synop reports:

VIRAC RADAR (98447)
988.9 mb at 00Z
986 mb at 06Z

DAET (98440)
987.4 mb at 05Z
982.7 mb at 12Z

MUÑOZ (98329)
978.6 mb at 18Z

BAGUIO (98328)
984.4 mb at 21Z
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#32 Postby doomhaMwx » Fri Apr 21, 2023 5:54 pm

BOPHA (2012)

An AWS at the landfall point recorded a pressure of 931.1 mb (16m elev) in the eye on 12/3 21Z, equivalent to 932.8 mb SLP. The winds are dubious though (the station is probably in a sheltered place).

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#33 Postby mrbagyo » Sat Apr 22, 2023 10:49 am

WAcyclone wrote:
1900hurricane wrote:
Highteeld wrote:Good info. Could make for an interesting min SLP extrapolation later.

I dug up this post to use the Schloemer equation to solve for minimum pressure. I used the measured 944 mb, the 30 km distance estimated here, a 22.224 km RMW estimate (from JTWC's 12 nm RMW at 18Z), and the 1001 mb OCI also from JTWC's best track. I ended up with a pressure estimate of 892 mb. Backrunning that pressure through KZC yields an intensity estimate of 154 kt.


Awesome analysis! However, it looks like Iguig was a bit further away from the centre than I previously thought. Based on the last 1845Z radar frame and JTWC's 290°/18 kt movement estimate I get a 19Z position estimate of 17.92N, 122.03E. That point is pretty close to 20 nautical miles north-east of Iguig.

It's also interesting to note that new data from the three weather stations around Gattaran/Lasam has recently become available on the weather.us site. Apparently, these stations went directly through the eye of Mangkhut with Gattaran recording a minimum pressure of 936.2 mb (and 11 kt sustained winds) at 21Z. I think this is quite impressive given the fact that landfall occurred almost three hours earlier and the eye had already traversed a mountain range...

Here is the direct link to the new data: https://weather.us/observations/1211-e-183-n/pressure-qff/20180914-2100z.html



Just found another surface obs from Gattaran, Cagayan. This one is from a DOST ASTI sensor which recorded a station pressure of 926.87 hPa (MSLP of approx. 932.7 hPa) just 30 minutes earlier than the 936.2 SLP reading

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#34 Postby doomhaMwx » Sat Apr 22, 2023 5:27 pm

HAIMA (2016)

STY Haima had a pressure obs of 934.25 mb (31.68m elev) on 10/19 17Z as it was traversing Luzon. SLP equivalent: 937.7 mb. Very impressive considering this was recorded two hours after landfall, not to mention the system was already well past peak when it reached land.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#35 Postby doomhaMwx » Fri Apr 28, 2023 4:54 pm

KENT (1995)

From JTWC's 1995 ATCR:
PAGASA Basco station recorded an MSLP of 928.3 mb in the eye, with max sustained winds and gusts of 116kts (1-min) and 140kts, respectively.
Kent was one of seven tropical cyclones and one of three typhoons to develop in August. It was also the first of five super typhoons to occur in 1995. Kent formed in the Philippine Sea and, after slow development, it rapidly intensified as it approached the Luzon Strait. Basco, Batan Island (WMO 98135), which was briefly in the northern part of Kent’s eye, observed a peak wind gust of 140 kt, and a minimum sea-level pressure of 928 mb.


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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#36 Postby doomhaMwx » Sun Apr 30, 2023 11:40 pm

mrbagyo wrote:
Imran_doomhaMwx wrote:
mrbagyo wrote:List of events with recorded MSLP below 940 hPa

1987
Super Typhoon Nina - 909.5 hPa (Recorded by Station in Legazpi City, Albay) - current national record low in Philippines
...

Is there another source for that pressure mentioned in Dr. Karl Hoarau's account? The official records maintained by PAGASA show that the lowest SLP at the Legazpi station on Nov 25, 1987, was 929.5 mb instead of 909.5 mb (which would also not be a national record low in the Philippines). One of them probably made a typo with that 2 or 0. Hmmm...

https://i.imgur.com/eohKqL2.png


Might indeed be a typo on the part of Dr. Hoarau. He actually misnamed Sisang as Rosing too add to the fact that 929.5 is actually close to JMA's estimate.

Found a report by JICA that also mentions 909.5 mb MSLP recorded in Legazpi. Safe to say that 929.5 mb is a typo.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#37 Postby mrbagyo » Wed May 03, 2023 11:37 am

doomhaMwx wrote:
mrbagyo wrote:
Imran_doomhaMwx wrote:Is there another source for that pressure mentioned in Dr. Karl Hoarau's account? The official records maintained by PAGASA show that the lowest SLP at the Legazpi station on Nov 25, 1987, was 929.5 mb instead of 909.5 mb (which would also not be a national record low in the Philippines). One of them probably made a typo with that 2 or 0. Hmmm...

https://i.imgur.com/eohKqL2.png


Might indeed be a typo on the part of Dr. Hoarau. He actually misnamed Sisang as Rosing too add to the fact that 929.5 is actually close to JMA's estimate.

Found a report by JICA that also mentions 909.5 mb MSLP recorded in Legazpi. Safe to say that 929.5 mb is a typo.

https://i.imgur.com/v8nmBBb.png


Dr. Karl Hoarau's blog post on typhoon2k website predates the JICA report, who knows if that blog post was also used as reference.
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#38 Postby doomhaMwx » Wed May 03, 2023 4:40 pm

doomhaMwx wrote:
mrbagyo wrote:Found a report by JICA that also mentions 909.5 mb MSLP recorded in Legazpi. Safe to say that 929.5 mb is a typo.

https://i.imgur.com/v8nmBBb.png


Dr. Karl Hoarau's blog post on typhoon2k website predates the JICA report, who knows if that blog post was also used as reference.

Looks like it was taken from PAGASA's 1987 ATCR, which doesn't seem to be available online.
Also, here's some data sourced from PAGASA itself (got it from a 2018 thesis paper):

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The table lists some landfalling TCs in the PH and corresponding surface obs, including Nina's 909.5 mb.
Year, Month, TC Name, Max Wind Speed, Lowest SLP, Max Rainfall
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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#39 Postby doomhaMwx » Mon May 08, 2023 5:44 am

WAYNE (1983)

MSLP of 932.1 mb at PAGASA Basco station.

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Re: Impressive Surface Observations in Typhoons (1980 Onwards)

#40 Postby doomhaMwx » Thu May 18, 2023 5:18 pm

FANAPI (2010)

During the 2010 ITOP program in the WPAC, several drifting buoys were deployed east of Taiwan ahead of Typhoon Fanapi. The lowest SLP recorded was 939mb in the eye, and max sustained winds were 38.4 m/s (75kts) — both by buoy 21952.

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