115
AXPQ20 PGUM 290059
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1059 AM ChST Sat Aug 29 2026

Tropical Weather Discussion for the Western North Pacific between
the Equator and 25N from 130E to 180. The following information is
based on recent satellite imagery/data, weather observations, radar,
and meteorological analysis.

...SPECIAL FEATURES...

TROPICAL CYCLONES...
As of 7:00 AM, Typhoon Bang-lang was located near 21.2N 167.3E,
moving NNE at 13 mph. Maximum sustained winds increased to 75 mph
overnight. Bang-lang remains fairly compact, with typhoon force winds
found within 10 miles of the center and tropical storm force winds
only out to around 40 miles from the center. Widespread showers and
isolated thunderstorms extend up to 170 miles N of the center and up
to 70 miles S. A couple of feeder bands are found to the S of Bang-
lang, with scattered to numerous showers and isolated thunderstorms
ahead of the monsoon trough from just S of Wake Island near 19N167E
to 17N165E and farther E within a band of convergence E of the
monsoon trough from near 20N169E. TY Bang-lang will make a turn
toward the N over the next couple of days, and is expected to
intensify through Sunday morning, then begin to weaken by Sunday
afternoon.

For more information on TY Bang-lang, please see bulletins issued by
the Joint Typhoon Warning Center under WMO header WTPN33 PGTW and
by the National Weather Service under WMO header WTPQ33 PGUM.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough enters the area near 20N130E, extending E through
a weak circulation centered near 21N134E, then turns more toward the
SE to E of the Marianas near 14N149E. It then turns E to 4N160E,
where it turns NNE into TY Bang-lang. From Bang-lang, the trough
turns ESE, crossing the Date Line near 17N. Scattered to numerous
showers and isolated thunderstorms are found mainly S of the monsoon
trough from 130E to SE of Guam near 150E. Another area of numerous
showers and isolated thunderstorms is found along and E of the
monsoon trough from N of Pohnpei to around 15N164E, with another
small band of showers and isolated thunderstorms along the trough
near Wake Island, feeding into TY Bang-lang. Another band of
scattered to numerous showers and isolated thunderstorms is found
within a band of convergence found E of the trough, from well S of
Wake Island, feeding into Bang-lang. As TY Bang-lang continues to
move N, the monsoon trough looks to slowly separate and regenerate
further S over the Marshall Islands. This will likely increase
convection across eastern Micronesia over the next few days.

SURFACE TROUGHS...
A surface trough that will likely develop into the monsoon trough
extends E from just N of Kwajalein near 10N169E to beyond the Date
Line near 10N. Scattered showers are found along and just S of this
trough from E of Majuro to E of the Date Line. This trough looks to
slowly drift W and strengthen over the coming days, possibly becoming
the new location for the monsoon trough.

Another surface trough extends SE from S of Kosrae to beyond the
Equator near 165E. Convergence NE of the trough is generating a band
of scattered showers and isolated thunderstorms from SE of Kosrae to
near Tarawa and Butaritari. This trough will continue to move NE
over the next couple of days, beginning to interact with and
strengthen the developing monsoon trough over the Marshall Islands.

$$

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