Weather
144
abpw10 pgtw 231530
msgid/genadmin/navmarfcstcen Pearl Harbor hi/jtwc//
subj/significant tropical weather advisory for the western and
/South Pacific oceans reissued/231530z-240600znov2009//
ref/a/msg/navmarfcstcen Pearl Harbor hi/231351znov2009//
ref/b/msg/navmarfcstcen Pearl Harbor hi/231352znov2009//
ref/c/msg/navmarfcstcen Pearl Harbor hi/231051znov2009//
narr/ref a is a tropical cyclone warning. Ref b is a tropical
/cyclone warning. Ref c is a tropical cyclone formation alert//
rmks/
1. Western North Pacific area (180 to Malay Peninsula):
a. Tropical cyclone summary:
(1) at 231200z, tropical storm 26w (Nida) was located near
8.8n 147.0e, approximately 307 nm south-southeast of Guam, and had
tracked west-northwestward at 09 knots over the past six hours.
Maximum sustained surface winds were estimated at 35 knots gusting
to 45 knots. See ref a (wtpn31 pgtw 231500) for further details.
(2) at 231200z, tropical depression 27w (twentyseven) was
located near 9.9n 126.5e, approximately 500 nm west-northwest of
Palau, and had tracked west-northwestward at 08 knots over the past
six hours. Maximum sustained surface winds were estimated at 25
knots gusting to 35 knots. See ref b (wtpn32 pgtw 231500) for
further details.
(3) no other tropical cyclones.
B. Tropical disturbance summary:
(1) the area of convection previously located near 8.2n
128.2e, is now the subject of a tropical cyclone warning. See para.
1.A.(2) for further details.
(2) the area of convection previously located near 3.7n
107.4e, is now located near 4.5n 107.2e, approximately 280 nm
northeast of singapore. Animated satellite imagery shows deep
convection consolidating near a quickly improving low level
circulation center (LLCC). A 230156z ascat pass shows an
increasingly symmetric LLCC with center winds of 10 to 15 knots.
Additionally, the ascat pass shows 30-knot peripherial winds to the
northwest (associated with the northeasterly cold surge through the
South China sea) and 20-25 knots to the southwest and southeast of
the system center. Finally, a 230931z AMSU microwave image depicts
multiple convective bands converging towards the LLCC, illustrating
the improving nature of the circulation. Upper-level analysis
indicates the system is located equatorward of the subtropical
ridge axis with radial outflow and favorably low vertical wind
shear. Maximum sustained surface winds are estimated at 15 to 20
knots. Minimum sea level pressure is estimated to be near 1005 mb.
The potential for the development of a significant tropical cyclone
within the next 24 hours is upgraded to good. See ref c (wtpn22
pgtw 231100) for further details.
(3) no other suspect areas.
2. South Pacific area (west coast of South America to 135 east):
a. Tropical cyclone summary: none.
B. Tropical disturbance summary: none.
3. Justification for reissue: upgraded area in para 1.B.(1) to
warning status and upgraded area in para 1.B.(2) to good.
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