793
AXPQ20 PGUM 110029
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1029 AM ChST Tue Aug 11 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...
At 7:00 am, Tropical Storm Peilou was centered well NE of Saipan,
and well WNW of Wake Island near 23.0N 154.8E, moving NE at 16 mph.
Peilou weakened to a TD overnight, but strengthened again to TS this
morning, with maximum sustained winds of 40 mph. Scattered to
numerous showers and isolated thunderstorms are found N of 22N from
152E to 157E. Peilou is expected to maintain this intensity through
this evening, then begin to weaken as it moves N of 25N.

For more information on TS Peilou, please see bulletins issued by
the Joint Typhoon Warning Center under WMO header WTPN32 PGTW and
by the National Weather Service under WMO header WTPQ32 PGUM.

TROPICAL AND MONSOON DISTURBANCES...
A broad, weak circulation, Invest 90W, is found NNW of Kwajalein,
centered near 11.5N 167.1E, moving slowly W. A relatively cloud free
Low-Level Circulation Center (LLCC) is seen on visible satellite
imagery. The only convection seen associated with 90W is to the W of
the center, between 166E and 167E. Invest 90W is currently rated
sub-low, meaning it is not expected to become a significant tropical
cyclone over the next few days. 90W is expected to continue moving
slowly W over the next few days with little to no change in
intensity.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough enters the region near 24N130E, extending ESE
through two weak circulations centered near 23N132E and 21N140E to
19N150E. Here, the trough turns NE into TS Peilou. A broad area of
scattered to numerous showers and isolated thunderstorms is found S
of the trough and two circulations, between 14N and 22N from 130E to
just W of the Marianas near 145E. Farther E, scattered showers and
isolated thunderstorms are seen leading into TS Peilou, where the
convection wraps into the system to the E. The monsoon trough looks
to continue to weaken over the next few days as Peilou continues to
pull the trough N.

SURFACE TROUGHS...
A series of three weak surface troughs are seen to the E of Invest
90W. The first is seen W of Weno, Chuuk, extending NW from near
8N146E. The second one is found between Pohnpei and Weno, extending
NNW from near 8N155E to end near 12N154E. The third one is found
between Pohnpei and Kosrae, extending N from near 7N160E to end near
12N160E. These three troughs are interacting with weak upper-level
divergence to generate scattered to numerous showers across Chuuk,
Pohnpei and Kosrae States. These troughs will continue to move
slowly E, maintaining convection across central Micronesia.

$$

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