290
AXPQ20 PGUM 020024
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1024 AM ChST Tue Dec 2 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...

TROPICAL AND MONSOON DISTURBANCES...
Invest 93W from JTWC is located near 13N135E, or well north of
Koror and north-northwest of Yap. It continues to slowly organize
(somewhat), with most of the convection today found on the eastern
half of the system as a weak monsoon flow has developed. This
system looks to continue to slowly organize as it heads west the
next few days, exiting Guam`s AOR as it crosses 130E sometime
later this week (probably later Friday or Saturday). Until then,
look for the asymmetric convective behavior to continue as
environmental conditions remain largely unchanged.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The NET from yesterday has transitioned into a monsoon trough
today, entering Guam`s AOR at 8N130E, curing north to 93W. As it
makes this northward curve near Ngulu at 8N137E, part of the
trough continues southeast as a NET fragment to a col at 2N145E,
ending at EQ155E. Widely-scattered showers and a few thunderstorms
are occurring south of the Monsoon trough between the equator and
8N from 130E to 137E, then near the remaining NET fragment.
Convection is more widespread near the northern extension of the
monsoon trough from Ngulu to Invest 93W. A similar convective
pattern is expected the next few days as 93W continues west,
dragging the troughs west with it.

TRADE-WIND TROUGHS...
A trade-wind trough extends from EQ155E northwest to 3N150E, where
it turns north bypassing Weno, Chuuk to the west, ending at
9N150E. Widespread showers and thunderstorms are developing along
this feature, and this looks to continue as it heads west the
next few days.

OTHER SYSTEMS...
A cold front enters Guam`s AOR at 19N180, stretching to south of
Wake Island where it transitions to a shear line at 16N167E. It
then continues wet to 15N155E, before curing northwest were it
intersects a developing area of low pressure at 25N145E. Scattered
showers are developing along and north of this cold front/shear
line. The area of low pressure will allow the western extent of
the shear line to become a warm front as the low pressure
develops, both of which will increase cloud cover and shower
coverage. The remainder of the shear line looks to slowly settle
south the next few days with showers continuing to develop along
it.

...ITCZ...
The ITCZ cross-quatorial flow has shifted east, now extending east
of Majuro from 6N174E to the Date Line and beyond. Here,
widespread cloud cover with scattered showers are developing. This
will continue the next few days, expanding west as the ITCZ
becomes better established.

$$

Doll