770
AXPQ20 PGUM 260131
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1131 AM ChST Mon Oct 26 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 AM ChST, Typhoon In-fa (30W) was located well N of Kosrae near
13.6N 163.7E. In-fa was moving NW at 9 mph. Maximum sustained winds
have increased to 90 mph. Numerous to widespread heavy showers and
isolated thunderstorms are found within 245 miles of the center of
In-fa. A couple of feeder bands with scattered to numerous showers
and isolated thunderstorms are found NNE to E of TY In-fa. In-fa is
expected to continue to move NW with a slight decrease in forward
speed through Tuesday, then make a turn WNW to W. In-fa is expected
to continue to strengthen, possibly becoming a category 2 typhoon
later today and a category 3 Wednesday or Thursday. Latest forecast
track takes In-fa through the far northern CNMI, near Pagan late in
the week into the weekend. However, this far out, the actual track
could change and all islands in the CNMI need to keep alert for any
forecast changes.

For more information on TY In-fa, please see bulletins issued by
the Joint Typhoon Warning Center (JTWC) under WMO header WTPN31 PGTW
and by the National Weather Service under WMO header WTPQ31 PGUM.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The remaining portion of the monsoon trough begins just NE of Yap
near 10N140E, extending ENE to TY In-fa, continuing E to beyond the
Date Line near 15N. Scattered to numerous showers and isolated
thunderstorms are found S of the trough, W to NW of Weno, Chuuk,
well S of Guam. This is in a band of convergence found between a
surface high pressure ridge WSW of Weno and the monsoon trough.
Little change is expected with this area of convection over the next
couple of days. E of Weno, only spotty showers are found S of the
trough. All other convection is associated with TY In-fa. The trough
looks to continue to be pulled NW with In-fa as it progresses.

SURFACE TROUGHS...
A surface trough is found E through S of Weno, extending SW from
near 7N155E to end near 4N151E. Scattered showers and thunderstorms
are found with this trough to the S to WSW of Weno. This trough will
continue to move ENE over the next couple of days, with little change
in intensity.

TRADE-WIND TROUGHS...
A broad, weak trade-wind trough is found W of the marianas, extending
NW from near 12N140E to near 21N132E. Spotty clouds and showers are
found with this trough. The trough looks to continue moving W over
the coming days as it slowly weakens.

$$

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