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200819W (JANGMI) - Profile

(Issued on October 10th, 2008)

Brief profile of JANGMI:

JTWC number 19W
International number 0815
Period of existence 24 September, 2008 02 HKT to 1 October, 2008 02 HKT
Lifetime 7.00 days
Maximum 1-minute wind (JTWC) 145 knots
Minimum pressure (JTWC) 914 hPa
Highest TC signal by HKO (if applicable) N/A
Closest point of approach by HKO (if applicable) N/A
Time of closest approach by HKO (if applicable) N/A
Lowest pressure recorded at HKO (if applicable) N/A

TC track from HKWW:

TC Track

Past HKWW Bulletins on JANGMI

Please click here for bulletins on JANGMI.

Storm Summary

JANGMI was the first category 5 super typhoon in 2008.

A disturbance developed to the northeast of Yap and subsequently intensified into a tropical depression on September 24th, and the JTWC gave it the temporary number 19W. Models diverged on 19W's future track, with some models forecasting a stronger ridge to drive the system into the South China Sea, some putting the system at Taiwan and some even depicting a recurvature. Initial forecasts by various agencies seemed to agree that the ridge supporting 19W's WNW motion would weaken a few days later and thus a NW movement was expected, but the ridge would strengthen later to provide a WNW track, a scenario that was similar to that of 18W (HAGUPIT) which brought a Signal 8 to Hong Kong earlier that month.

JANGMI intensified steadily while travelling WNW. The JMA upgraded 19W into a tropical storm at 20 HKT the same day and named it JANGMI, a name provided by South Korea meaning (a type of) rose. JANGMI intensified into a severe tropical storm early on September 25th and its track shifted westward, possibly due to re-organization of its circulation.

The ridge weakened the day after and JANGMI was propelled NNW then NW during September 26th. JANGMI was upgraded to typhoon by the JMA and the HKO at 02 HKT on that day. It travelled NW while intensifying steadily for the rest of the day, reaching 120 knots in 1-minute standard by the end of September 26th.

The CWB of Taiwan issued the sea typhoon warning at 23:30 HKT on September 26th as JANGMI was expected to affect seas near Taiwan in the coming 24 hours. Already a major tropical cyclone, JANGMI continued to intensify early on September 27th which prompted the CWB to upgrade the system into a severe typhoon. The CWB issued the land and sea typhoon warning at 08:30 HKT and predicted that JANGMI would make landfall in southern Taiwan on the next day. The JTWC estimated JANGMI's intensity to be 135 knots (upper limit of a category 4 typhoon) and was therefore a super typhoon by 08 HKT.

JANGMI reached peak intensity in the early afternoon of September 27th. However most agencies revised their strength significantly upward only in the 20 HKT's bulletin, possibly because aircraft reconnaissance in the afternoon (see Table 3) showed a minimum pressure of 906 hPa and a flight-level maximum wind speed of 163 knots. The JTWC's maximum wind speed (1-minute average) reported operationally was 135 knots, but revised upward to 145 knots later during in-season best track analysis which made JANGMI the most intense storm (as a category 5 super typhoon) so far this year. The JMA estimated JANGMI's maximum winds (10-minute average) at 115 knots, the first storm to "beat" the 110-knot barrier in nearly a decade. However, the most abrupt change in intensity was reported by the HKO (10-minute average), from 100 knots (185 km/h) at 08 HKT that day to 125 knots (232 km/h) at 20 HKT the same day with a pressure of 900 hPa. The T-number observed from satellite imageries was estimated to be 7.0.

By that time, the ridge has weakened considerably and a recurvature was becoming very likely.

JANGMI shifted a bit towards WNW during September 27th, but resumed a NW motion from September 28th. Proximity to land led to its weakening into a category 4 cyclone and it made landfall at Ilan during the afternoon of September 28th at a strength of 115 knots (JTWC) / 110 knots (JMA) / 115 knots (HKO). JANGMI brought heavy rainfall and extremely strong winds to Taiwan.

JANGMI lingered in northern Taiwan for quite some time before eventually emerging at Taoyuan at about 04:20 HKT on September 29th. Interactions with Taiwan's mountains severely damaged JANGMI's structure, and it could only manage to go back into open seas as a severe tropical storm. JANGMI travelled parallel to the coastline of Zhejiang during the day while weakening gradually.

After crossing the ridge axis, JANGMI turned eastward along the northern periphery of the subtropical ridge on September 30th, and transformed into an extratropical cyclone before reaching the seas south of Japan early on October 1st.

Figures

Figure 1 - Initial track by various agencies

Figure 2 - Steering flow chart at 14 HKT on September 27th

Figure 3 - Visible imagery of JANGMI near peak intensity (14:30 HKT, September 27th)

Figure 4 - Infrared imagery of JANGMI near peak intensity (21 HKT, September 27th)

Figure 5 - Calculated wind field of JANGMI near peak intensity (14 HKT, September 27th). Note the inner 110-knot wind area.

Other Data

Table 1: Track data from HKWW:

YYMMDDZZ Lat Long Wind
08092318 116N1386E 025
08092400 119N1377E 030
08092406 121N1373E 040
08092412 124N1365E 045
08092418 131N1352E 050
08092500 137N1339E 055
08092506 146N1325E 065
08092512 148N1313E 070
08092518 151N1303E 080
08092600 160N1297E 090
08092606 169N1288E 090
08092612 178N1280E 105
08092618 187N1272E 120
08092700 196N1265E 130
08092706 207N1256E 140
08092712 213N1244E 140
08092718 218N1237E 140
08092800 228N1231E 135
08092806 240N1224E 120
08092812 242N1216E 100
08092818 248N1212E 075
08092900 255N1212E 060
08092906 265N1212E 055
08092912 270N1220E 050
08092918 276N1225E 045
08093000 288N1237E 045
08093006 295N1250E 045
08093012 297N1264E 040
08093018 298N1283E 035
08100100 301N1305E 035

Table 2: Track data from JTWC:

ID      Name   YYMMDD ZZZZ  Lat    Long   Basin Wind Pres
19W     JANGMI 081001 0600  30.1N  133.3E WPAC   35   996
19W     JANGMI 081001 0000  30.2N  130.5E WPAC   35   996
19W     JANGMI 080930 1800  30.1N  128.4E WPAC   35   996
19W     JANGMI 080930 1200  29.9N  126.7E WPAC   45   989
19W     JANGMI 080930 0600  29.5N  125.1E WPAC   45   989
19W     JANGMI 080930 0000  28.7N  123.8E WPAC   45   989
19W     JANGMI 080929 1800  27.8N  122.7E WPAC   45   989
19W     JANGMI 080929 1200  27.3N  122.1E WPAC   55   982
19W     JANGMI 080929 1200  27.3N  122.1E WPAC   55   982
19W     JANGMI 080929 0600  26.7N  121.4E WPAC   55   982
19W     JANGMI 080929 0600  26.7N  121.4E WPAC   55   982
19W     JANGMI 080929 0000  25.7N  121.1E WPAC   60   978
19W     JANGMI 080929 0000  25.7N  121.1E WPAC   60   978
19W     JANGMI 080928 1800  24.8N  121.5E WPAC   75   967
19W     JANGMI 080928 1800  24.8N  121.5E WPAC   75   967
19W     JANGMI 080928 1800  24.8N  121.5E WPAC   75   967
19W     JANGMI 080928 1200  24.1N  121.4E WPAC   85   959
19W     JANGMI 080928 1200  24.1N  121.4E WPAC   85   959
19W     JANGMI 080928 1200  24.1N  121.4E WPAC   85   959
19W     JANGMI 080928 0900  24.7N  121.7E WPAC  115   937
19W     JANGMI 080928 0900  24.7N  121.7E WPAC  115   937
19W     JANGMI 080928 0900  24.7N  121.7E WPAC  115   937
19W     JANGMI 080928 0600  23.9N  122.4E WPAC  115   937
19W     JANGMI 080928 0600  23.9N  122.4E WPAC  115   937
19W     JANGMI 080928 0600  23.9N  122.4E WPAC  115   937
19W     JANGMI 080928 0000  22.9N  123.2E WPAC  130   926
19W     JANGMI 080928 0000  22.9N  123.2E WPAC  130   926
19W     JANGMI 080928 0000  22.9N  123.2E WPAC  130   926
19W     JANGMI 080927 1800  21.8N  123.7E WPAC  135   922
19W     JANGMI 080927 1800  21.8N  123.7E WPAC  135   922
19W     JANGMI 080927 1800  21.8N  123.7E WPAC  135   922
19W     JANGMI 080927 1200  21.3N  124.4E WPAC  140   918
19W     JANGMI 080927 1200  21.3N  124.4E WPAC  140   918
19W     JANGMI 080927 1200  21.3N  124.4E WPAC  140   918
19W     JANGMI 080927 0600  20.7N  125.6E WPAC  145   914
19W     JANGMI 080927 0600  20.7N  125.6E WPAC  145   914
19W     JANGMI 080927 0600  20.7N  125.6E WPAC  145   914
19W     JANGMI 080927 0000  19.7N  126.4E WPAC  135   922
19W     JANGMI 080927 0000  19.7N  126.4E WPAC  135   922
19W     JANGMI 080927 0000  19.7N  126.4E WPAC  135   922
19W     JANGMI 080926 1800  18.7N  127.2E WPAC  120   933
19W     JANGMI 080926 1800  18.7N  127.2E WPAC  120   933
19W     JANGMI 080926 1800  18.7N  127.2E WPAC  120   933
19W     JANGMI 080926 1200  17.8N  128.0E WPAC  105   944
19W     JANGMI 080926 1200  17.8N  128.0E WPAC  105   944
19W     JANGMI 080926 1200  17.8N  128.0E WPAC  105   944
19W     JANGMI 080926 0600  16.9N  128.9E WPAC   95   952
19W     JANGMI 080926 0600  16.9N  128.9E WPAC   95   952
19W     JANGMI 080926 0600  16.9N  128.9E WPAC   95   952
19W     JANGMI 080926 0000  15.9N  129.7E WPAC   90   956
19W     JANGMI 080926 0000  15.9N  129.7E WPAC   90   956
19W     JANGMI 080926 0000  15.9N  129.7E WPAC   90   956
19W     JANGMI 080925 1800  15.1N  130.3E WPAC   80   963
19W     JANGMI 080925 1800  15.1N  130.3E WPAC   80   963
19W     JANGMI 080925 1800  15.1N  130.3E WPAC   80   963
19W     JANGMI 080925 1200  14.6N  131.4E WPAC   70   970
19W     JANGMI 080925 1200  14.6N  131.4E WPAC   70   970
19W     JANGMI 080925 1200  14.6N  131.4E WPAC   70   970
19W     JANGMI 080925 0600  14.5N  132.4E WPAC   65   974
19W     JANGMI 080925 0600  14.5N  132.4E WPAC   65   974
19W     JANGMI 080925 0000  13.9N  133.6E WPAC   55   982
19W     JANGMI 080925 0000  13.9N  133.6E WPAC   55   982
19W     JANGMI 080924 1800  13.2N  135.1E WPAC   50   985
19W     JANGMI 080924 1200  12.7N  136.3E WPAC   45   989
19W     JANGMI 080924 0600  12.2N  137.2E WPAC   45   989
19W     JANGMI 080924 0000  11.8N  137.9E WPAC   35   996
19W     JANGMI 080923 1800  11.4N  138.6E WPAC   30  1000
19W     JANGMI 080923 1200  10.9N  139.5E WPAC   25  1004
19W     JANGMI 080923 0600  10.7N  140.2E WPAC   20  1007
19W     JANGMI 080923 0000  10.6N  140.8E WPAC   15  1010
19W     JANGMI 080922 1800  10.4N  141.6E WPAC   15  1010

Table 3: Aircraft reconnaissance report (Data at 14:55 HKT, September 27th)

URPA12 PGUA 270755
VORTEX DATA MESSAGE
A. 27/07:55:30Z
B. 20 deg 58 min N
  125 deg 05 min E
C. 700 mb 2294 m
D. 118 kt
E. 135 deg 10 nm
F. 237 deg 136 kt
G. 137 deg 11 nm
H. 906 mb
I. 12 C / 3049 m
J. 24 C / 3043 m
K. 9 C / NA
L. CLOSED
M. C18
N. 12345 / 7
O. 0.02 / 1.5 nm
P. AF306 0747W JANGMI       OB 28
MAX FL WIND 163 KT E QUAD 06:16:40Z
SFC CNTR 360 / 4 NM FROM FL CNTR
WELL DEVELOPED EYE, FULL STADIUM EFFECT VISIBLE WITH 
SEVERAL STRAITIONS IN EYEWALL CLOUDS RUNNING DIAGONALLY 
ALONG WALL SURFACE FROM TOP TO BASE.

Last Accessed: Mon Aug 26 2019 03:03:52 HKT
Last Modified: Tue Dec 24 2013

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