445
AXPQ20 PGUM 102357
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
957 AM ChST Thu Jun 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...

None.

...OTHER WEATHER SYSTEMS...

NEAR-EQUATORIAL TROUGH...
Today, the NET enters Guam`s AOR at EQ150E and extends north-
northeast to 7N152E, near Chuuk. The NET then turns east heading
through Pohnpei, where it turns southeast to Kosrae, and continues
east to 5N180 and beyond. South of the NET, westerly flow has
strengthened slightly. Pockets of convection continue to develop near
and within 200 miles of the NET axis. This feature is forecast to
continue to slowly strengthen over the next several days, with a
gradual increase in coverage and intensity. The NET is expected to
remain quasi-stationary over the next few days.

SURFACE TROUGHS...
A surface trough has developed in the trades as the synoptic
pattern modifies. This trough stretches northwest from EQ145E
through Koror, ending northwest of there near 12N133E. Scattered
showers will continue to develop northwest of Palau. This feature
will head west over the next few days.

A series of weak surface troughs has developed just north of
Pohnpei, with the leading trough near Pohnpei and the rest of the
troughs trailing to the northeast to near Wake Island. A cluster of
thunderstorms have developed near an 850-500mb vorticity center
around 10N158E to the north of Pohnpei. Isolated to scattered
showers are starting to develop along these troughs, from north of
Pohnpei and northward to 15N. The remainder of the surface troughs
lacks any appreciable convection. Pattern analysis suggests that
these troughs could hang around for at least another day or two
(possibly longer) as they head westward.

OTHER SYSTEMS...
A slowly-weakeneing cold front enters Guam`s AOR near 25N180,
extending southeast to 22N170E (northeast of Wake Island), where
it transitions into a shear line. It then, continues west-southwest
to 17N150E, before taking on a bow-like structure. The apex of the
curve is seen between Saipan and Anatahan. This feature then extends
northwest to near 20N143E where it ends. Pockets of convection are
developing along this feature, mainly between the CNMI and 155E. It
remains unclear how long the shear line will maintain integrity, but
it`s probable that a similar orientation and convective behavior will
continue for another day or two.

Further southwest, a weak upper low has opened into a trough and is
located to the north-northwest of Yap near 13N137E. A cluster of
thunderstorms have developed east of there near 13N140E. This
weakening feature will maintain enough lift for scattered showers and
a few thunderstorms to persist another day or two as the weakening
feature continues to slowly head west.

$$

Doll/Bowsher