679
AXPQ20 PGUM 220035
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1035 AM ChST Fri Aug 22 2025

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...

None.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
A weak monsoon trough extends southeast from near Mindanao, crossing
130E near 5N. This weak trough ends just west of a broad weak
circulation centered near 5N136E. Scattered showers and isolated
thunderstorms are found along and south of the trough and
circulation. Little change in intensity is expected as the trough
meanders north and south over the next few days.

TRADE-WIND TROUGHS...
A broad, weak circulation is centered near 5N136E. A trade-wind
trough extends north from the circulation to end near 12N135E.
Scattered to numerous showers are found north of the circulation and
along the trough. This includes most of Palau. Another trough extends
northeast from the circulation to just southeast of Guam near
12N145E, then turns east-northeast to end near 14N155E. Upper-level
divergence is interacting with the circulation and trough west of
147E to produce scattered to numerous showers and isolated
thunderstorms east of Palau, across Yap Proper and the Marianas. East
of 147E, patchy showers and a couple thunderstorms are evident. This
trough looks to move very slowly west-northwest with little change
in intensity over the coming days.

Another trade-wind trough is found between Pohnpei and Weno, Chuuk,
extending north-northeast from near 1N154E to end near 9N156E.
Patchy showers and isolated thunderstorms are found with this trough.
The trough looks to continue to move west over the next couple of
days with little change in intensity.

The next trough is seen west of Kosrae, extending northeast from near
3N159E to end north of Kwajalein near 11N167E. Patchy showers and a
couple thunderstorms are associated with this trough. The trough and
convection look to continue west over the next few days with little
change in intensity.

A pair of weak trade-wind troughs are generating scattered to
numerous showers south of Kwajalein and Majuro. The first trough
extends north-northeast from near 2N167E to end near 8N170E. The
second trough extends north-northeast from near 2N171E to end near
7N174E. Both troughs will move west over the coming days and look to
merge somewhere near Kosrae.

TUTT...
The TUTT enters the region near 25N172E, extending southeast to a
cell centered 22N174E. The TUTT then turns southwest to another weak
cell southwest of Wake Island near 16N165E. The TUTT then turns
northwest to a third cell centered near 25N154E. Isolated showers and
thunderstorms are found near the first cell. Divergence north the
trough and second cell is generating scattered showers and
thunderstorms. Scattered showers and thunderstorms are also found
with the third cell. The TUTT looks to strengthen over the region
over the next couple of days as it drifts south.

...ITCZ...
A weakening ITCZ is found east-northeast of Majuro, extending east-
southeast from near 9N175E to beyond the Date Line near 8N. Scattered
showers are found along the ITCZ. The ITCZ looks to continue to
weaken over the next day or two, with convection decreasing.

$$

Kleeschulte