385
AXPQ20 PGUM 060103
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1103 AM ChST Sun Sep 6 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...

None.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough enters our AOR near 25N140E, extending southeast
through a col centered over the far northern Marianas. From there,
the trough continues south-southeast towards eastern Micronesia,
passing through a couple of embedded circulations centered near
5N160E (between Pohnpei and Kosrae) and 8N168E (south of Kwajalein)
before exiting the Date Line to the east around 9N. Scattered to
numerous showers and isolated thunderstorms are occurring about 600
miles south of the trough axis from 130E to 148E. Within this area,
the Marianas are experiencing a convectively active pattern thanks
to the westerly convergence buckling against the previously mentioned
col. To the southeast, an area of convergence between the westerlies
and the circulation is producing scattered to numerous showers and
isolated thunderstorms between Chuuk and Pohnpei. Finally, an area of
scattered showers and widespread cloud cover follows the trough axis
from Majuro to its exit at the Date Line. The monsoon trough is
expected to remain fairly unchanged in intensity and location for the
next few days.

SURFACE TROUGHS...
The previously mentioned circulations centered near 5N160E and
8N168E each have a surface trough extending to the south-southeast,
ending near the Equator. These troughs are producing scattered to
numerous showers and isolated thunderstorms south of Pohnpei, Kosrae,
and Majuro. These troughs will remain unchanged in intensity and
position for the next few days, potentially consolidating into one as
the parent circulations combine and move west.

TRADE-WIND TROUGHS...
A trade-wind trough extends from 18N176E west-northwest to 22N172E.
A period of convection and isolated thunderstorms was apparent
earlier this morning, but has since settled down and left behind
mid-level cloud debris and cirrus. Partly cloudy skies of cumulus
clouds are still advecting with the trough. Over the next few days,
this trough will gradually move west with little to no change in
intensity.

$$

Mesa