WPAC: Typhoon KROSA

[Chacor]

Thanks Chacor.

There's a new max rainfall total I've seen on CWB website.

Fengqi Lake in Jiayi County - 1112mm!!!!!!

Access to CWB's site is rather unreliable right now, they seem to be having high traffic issues. If you have it on hand, do you have a screenshot (or a copy-paste of the text)?

[Chacor]

Never mind - just seen it.

５、５日０時至７日１７時止出現較大雨量地區如下：嘉義縣奮起湖１１１２毫米、宜
　　蘭縣太平山１０７２毫米、新竹縣鳥嘴山１０１３毫米、苗栗縣泰安８５６毫米、
　　台中縣雪嶺８５２毫米、屏東縣尾寮山８１１毫米、南投縣神木村７６１毫米、雲
　　林縣草嶺７４８毫米、高雄縣小關山７２０毫米、桃園縣高義７１２毫米、台南縣
　　關山６１８毫米、台北縣四堵６０１毫米、台北市鞍部５５９毫米。

Also 1072 mm (42.2 inches) at Taiping Mountain in Yilan. Quite amazing rainfall totals, even if they are 65 hour totals.

[Chacor]

Hmm... yet another occurrence this year of an earthquake coinciding with a tropical cyclone.

CWB:
2007-10-07 15:39:00 5.0 063 24.53N 122.47E, i.e. 78.0 km ESE of Yilan City

[alan1961]

Great pictures Typhoon..thanks

[alan1961]

Typhoon Krosa shedding a tear
http://www.nrlmry.navy.mil/tc-bin/tc_ho ... &SIZE=full

[Typhoon Hunter]

Cheers Alan.

Hey Chacor.

Thanks for that info on the earthquake. It happened during TY Haitang back in 2005....weird.

Here are the wind reports too

出現較大陣風
地區如下：蘇澳、蘭嶼１６級，基隆、宜蘭、梧棲１５級，花蓮、台東縣成功１３級，台北、馬祖１２級，新竹、恆春１１級，台中、嘉義、台南、高雄、澎湖１０級。

下次警報預定發布時間為 10月7日20時30分

[HURAKAN]

Track fix??!!??





Maybe they believed no one was going to notice it!!!

[stu]

Any one care to suggest why? Krosa did a loop the loop during landfall - what caused it ??

[Typhoon Hunter]

Hey Stu.

Glad to see you guys made it through safely and had a good time. I'm not sure of the physics but it's to do with the 3500m mountains of central Taiwan. Typhoon Haitang did the same thing in 2005.

It seems lots of powerful typhoons as they approach Taiwan suddenly do a loop or suddenly jog westwards. Wipha made a pronounced westward jog when it passed just north of Taiwan. Sepat dived west just before landfall in August, as did typhoon Talim back in 2005.

[stu]

Thanks James for the info (FYI I am STILL in Taiwan, back to London tomorrow)

I need to read up on this concept - I guess it could be that 0-3000 meter winds are somehow deflected back towards the eye causing it to stall - at such time that the eye winds reduce there is less feedback from the mountains, allowing the overall wind stering winds to continue pushing the tyhoon along on its normal track. This may also explain where the CAT4 winds and low pressures went as well.

[Typhoon Hunter]

Video now online, hope you enjoy:

http://www.youtube.com/watch?v=XNJvI0t2rJI

[JonathanBelles]

Awesome Video!

[wxmann_91]

Any one care to suggest why? Krosa did a loop the loop during landfall - what caused it ??

Trochoidal oscillations. An outer eyewall had developed right before it made landfall - the inner eyewall must've rotated about in the larger gyre of the outer eyewall.

[Derek Ortt]

it is well documented that the mountains cause oscillations in storm track

[Aslkahuna]

The eastern side of Taiwan is a mountain wall for the most part so the storms will try to find an easier way to go. Basically, if you look at the radar loop above, Krosa literally bounced off this wall and swung around and did an end around across the NE corner of Taiwan following the path of least resistance. I saw this happen in the Philippines when I was there. If one looks at the track of STY Rita in 1978, the BT shows the storm making a smooth shift NW off the east coast of Luzon-also a mountain wall. The reality I saw on radar was rather different. The storm was headed directly at us but turned abruptly due north as it approached the mountains and headed north until it reached the gap behind Dingalan Bay whereupon it promptly shot WNW across the island just below the northern mountains. As a result the storm passed 40 miles north of us instead of nearly over us and we gusted to only 58 kt instead of the 100kt gusts we were expecting.

Steve

[Chacor]

Currently 34 mph gusting 45 mph at Shanghai-Pudong.

[Chacor]

673
WTPQ21 RJTD 080600
RSMC TROPICAL CYCLONE ADVISORY
NAME TS 0715 KROSA (0715)
ANALYSIS
PSTN 080600UTC 27.9N 120.2E FAIR
MOVE ALMOST STATIONARY
PRES 1000HPA
MXWD 035KT
GUST 050KT
30KT 150NM SOUTHEAST 120NM NORTHWEST
FORECAST
24HF 090600UTC 29.4N 123.9E 100NM 70% EXTRATROPICAL LOW =

12 hour forecast:
FORECAST POSITION FOR 081800UTC AT 28.6N 121.9E WITH 60 MILES RADIUS
OF 70 PERCENT PROBABILITY CIRCLE.
1004 HPA, MAX WINDS 35 KNOTS.

[Chacor]

Not even going to last till then. Extratropical.

640
WTPQ21 RJTD 081200
RSMC TROPICAL CYCLONE ADVISORY
NAME DEVELOPED LOW FORMER TS 0715 KROSA (0715)
ANALYSIS
PSTN 081200UTC 29N 122E
MOVE ENE 10KT
PRES 1006HPA
MXWD 040KT
30KT 300NM =

[Chacor]

JTWC still doing advisories. It is very rare for the JMA to declare a storm extratropical and yet the JTWC continues advisories - usually it's the other way round.

[Chacor]

JTWC has issued its final advisory.

JMA tracking the extratropical low.

GALE WARNING.
DEVELOPED LOW 1008 HPA
AT 29N 123E EAST CHINA SEA MOVING EAST 10 KNOTS.
WINDS 30 TO 35 KNOTS WITHIN 300 MILES OF LOW.