WPAC: NANMADOL - Post-Tropical

[mrbagyo]

 https://twitter.com/weather_models/status/1570950084115955714

[Hurricane2022]

16W NANMADOL 220917 0000 26.0N 133.1E WPAC 130 917

 https://twitter.com/CyanideCN_/status/1570950375393591299




 https://twitter.com/CyanideCN_/status/1570952411325534208

[aspen]

16W NANMADOL 220917 0000 26.0N 133.1E WPAC 130 917

https://twitter.com/CyanideCN_/status/1570950375393591299

https://twitter.com/CyanideCN_/status/1570952411325534208

Great to see that we’re getting good recon data from a WPac storm. Looks like the JTWC’s 00z intensity wasn’t them being too conservative, but instead actually having direct measurements from inside the storm. I hope they do at least one more center pass so we can see if Nanmadol is weakening and peaked at 135-140 kt, or if it has leveled off in intensity and maybe didn’t reach 135 kt earlier in the day.

[Hurricane2022]

Aircraft Recon made an 2nd pass!
 https://twitter.com/CyanideCN_/status/1570958378519916545

[doomhaMwx]

From what I see on today's recon mission, central pressure is about 915-920mb?

[Hurricane2022]

Nanmadol is basically a stronger version of Sam in the WPAC
All the two had 0 aircraft recon passes at peak intensity

[doomhaMwx]

Photo of the eye and eyewall from today's recon mission. This is the final recon mission into Nanmadol according to the University of Ryukyus.


 https://twitter.com/met_rq/status/1570973868696948738

[doomhaMwx]

Remains 910mb from JMA at 06Z. I was expecting them to increase it to 915mb after earlier's recon mission.

T2214(Nanmadol)
Issued at 2022/09/17 06:50 UTC
Analysis at 09/17 06 UTC
Grade TY
Scale Large
Intensity Violent
Center position N26°40′ (26.7°)
E132°30′ (132.5°)
Direction and speed of movement NW 20 km/h (10 kt)
Central pressure 910 hPa
Maximum sustained wind speed near center 55 m/s (105 kt)
Maximum wind gust speed 75 m/s (150 kt)
Radius of 50-kt wind area E185 km (100 NM)
W150 km (80 NM)
Radius of 30-kt wind area E750 km (400 NM)
W650 km (350 NM)

[mrbagyo]

Core is now within radar range

[doomhaMwx]

 https://twitter.com/weather_and_law/status/1571127837188558849



 https://twitter.com/NHKWORLD_News/status/1571126775270309888

[Hurricane2022]

 https://twitter.com/JMA_kishou/status/1571133976575889408

[doomhaMwx]

Quite a rapid weakening overnight — the eye has disappeared on satellite imagery and under the hood, radar shows that both the inner and secondary eyewalls have also degraded, unable to complete a conventional EWRC.

[doomhaMwx]

16W NANMADOL 220918 0000 29.7N 131.0E WPAC 105 939

T2214(Nanmadol)
Issued at 2022/09/18 00:50 UTC
Analysis at 09/18 00 UTC
Grade TY
Scale Large
Intensity Very Strong
Center position N29°40′ (29.7°)
E131°00′ (131.0°)
Direction and speed of movement NNW 20 km/h (12 kt)
Central pressure 925 hPa
Maximum sustained wind speed near center 50 m/s (95 kt)
Maximum wind gust speed 70 m/s (135 kt)
Radius of 50-kt wind area NE185 km (100 NM)
SW165 km (90 NM)
Radius of 30-kt wind area E750 km (400 NM)
W650 km (350 NM)

[doomhaMwx]

The center is nearing Yakushima Island and it seems land surface friction is somehow tightening up the storm's circulation. A nascent eye has popped back up on satellite while radar shows the inner eyewall has become more robust.

[mrbagyo]

Pressure in Yakushima is down to 938.2 hPa (as of 1150 JST)

[sikkar]

That island got brutalized. Luckily the winds are not correlating with pressure due to the failed ewrc. Still a nightmare for them.

[Mob1]

Max gust for the island so far is 114 mph

[sikkar]

Pressure bottomed out at 932.3. Anybody saw wind report higher than 36.4 ms (not gust) ?

[doomhaMwx]

Based on the observation summary from JMA, the 932.3mb min SLP at Yakushima Island inside the eye appears to have lasted from 1:10pm - 1:13pm JST. Max sustained winds and gusts recorded in the eyewall were 36.6 m/s (71kts) and 50.9 m/s (99kts), respectively.

932.3mb is a new record low for this island, surpassing the 938.7mb set by Typhoon Olive in 1971.

[doomhaMwx]

16W NANMADOL 220918 0600 30.7N 130.7E WPAC 95 947

T2214(Nanmadol)
Issued at 2022/09/18 06:45 UTC
Analysis at 09/18 06 UTC
Grade TY
Scale Large
Intensity Very Strong
Center position N30°40′ (30.7°)
E130°40′ (130.7°)
Direction and speed of movement NNW 20 km/h (11 kt)
Central pressure 930 hPa
Maximum sustained wind speed near center 45 m/s (90 kt)
Maximum wind gust speed 65 m/s (130 kt)
Radius of 50-kt wind area NE260 km (140 NM)
SW185 km (100 NM)
Radius of 30-kt wind area E750 km (400 NM)
W650 km (350 NM)