148
AXPQ20 PGUM 300021
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1021 AM ChST Sun Aug 30 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...
Earlier this morning, the last advisory for Typhoon Bang-lang (20W)
was issued due to its position N of 25N and out of our Area of
Responsibility (AOR).

For more information on TY Bang-lang, see bulletins issued by the
Joint Typhoon Warning Center (JTWC) under WMO header WTPN33 PGTW.

TROPICAL AND MONSOON DISTURBANCES...
A monsoon disturbance, Invest 94W, is centered W of the far northern
CNMI near 20.4N 135.2E, moving NW. 94W is currently rated as medium,
meaning development into a significant tropical cyclone is likely,
but not within the next 24 hours. Enhanced infrared satellite data
currently shows a weak, disorganized Low-Level Circulation Center
(LLCC) with persistent, pulsing convection obscuring the center. The
latest 925mb analysis shows an elongated LLCC with weak surrounding
winds. Low vertical wind shear and favorable equatorward outflow
combined with the favorable sea surface temperatures indicate
conditions conducive for development. Scattered to numerous showers
and isolated thunderstorms are found within 300 miles of the center.

For more information on Invest 94W, see bulletins issued by JTWC
under WMO header ABPW10 PGTW.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough enters the region near 21N130E, extending ESE
through Invest 94W to the northern CNMI near 19N145E. It then turns
SE to pass through a weak circulation centered NNE of Weno, Chuuk
near 12N153E, where it turns ESE, across the Marshall Islands to E
of the Date Line near 10N. A decaying monsoon trough fragment
extends NNE from near 15N158E to beyond 25N to the NNW of Wake
Island near 164E. A monsoon surge S of the trough, well W of the
Marianas is generating numerous showers and isolated thunderstorms
in a 140 mile wide band from near 16N130E to 14N137E. Another band
of convection is found W of the Marianas within a col region,
feeding into Invest 94W. A narrow dry region is seen across the
Marianas. To the S of Guam, convergence S of the trough and weak
circulation N of Weno is generating scattered to numerous showers
and isolated thunderstorms across eastern Yap State and Chuuk State,
to include Weno. A weak surge S of the trough is also generating
scattered to numerous showers from W of Pohnpei, across Pohnpei and
Kosrae States to Majuro, eastward to beyond the Date Line. A band of
scattered showers and isolated thunderstorms is found in a band of
convergence to the E of the decaying monsoon trough fragment, E of
Wake Island. The monsoon trough looks to strengthen over the next
few days, with increasing convection across the Marianas, and across
Micronesia, mainly E of Satawal, Yap. The monsoon trough fragment
will continue to weaken with decreasing convection.

$$

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