924
AXPQ20 PGUM 140103
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1103 AM ChST Sat Jun 14 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...

TRADE-WIND TROUGHS...
A few trade-wind troughs are evident across the region. The first is
found over Palau and Yap State, extending northeast from near 3N130E
to near 9N140E. Upper-level divergence over the area is enhancing
convection to generate numerous showers and isolated thunderstorms
just east of Palau and Yap Proper, with scattered showers and
isolated thunderstorms seen across Palau, northwestward to beyond
130E. This trough and associated convection will slowly move west-
northwest over the coming days.

The next, weak, trough is seen farther north, stretching northward
from near 10N135E to 14N135E. This weak trough is interacting with
the TUTT to produce scattered showers and a few thunderstorms well
west of the Marianas. This trough will continue westward over the
next few days, likely moving out of the region Sunday.

The last trough is seen over the Marshall Islands, east of Kosrae.
This trough extends north-northeast from near 1N168E to  east of
Majuro near 10N176E. The trough is interacting with the ITCZ to
produce numerous showers and isolated thunderstorms along the ITCZ
west of 173E, with scattered showers and a few thunderstorms seen
with the northern portion of the trough near Majuro. This trough will
continue to move west over the next few days, dragging the ITCZ west
with it.

TUTT...
The TUTT extends west-northwest across the Date Line near 20N to a
weak cell centered near 22N172E. It then turns west-southwest to a
TUTT cell centered west of Wake Island near 20N159E, then continues
west-southwest to end near 14N130E. Mostly spotty clouds and showers
are found along the TUTT and the weak TUTT cell. However, numerous
showers and scattered thunderstorms are found to the northeast of the
cell centered near 20N159E. A weak trade-wind trough is interacting
with the TUTT to produce scattered showers and a few thunderstorms
in the area of the strongest divergence well west of the Marianas,
west of 139E. The TUTT and the stronger cell look to remain quasi-
stationary over the next few days while the weaker cell is expected
to become an open trough.

OTHER SYSTEMS...
There are 2 weak bands of trade-wind convergence seen across the
region. The first is seen south of Guam, extending east-northeast
from near 10N145E to near 13N155E. Scattered showers are seen along
this band. The second band of trade-wind convergence is found south
of Weno, Chuuk to north of Pohnpei, extending west from near 6N150E
to 6N161E. Scattered showers are seen along this band of convergence.
Both of these features look to drift west over the coming days as
they slowly weaken.

...ITCZ...
An ITCZ crosses into eastern Micronesia near 4N180 to end south of
Kosrae near 2N162E. Scattered showers are found with the ITCZ east
of 173E. Farther west, a trade-wind trough is interacting with the
ITCZ, enhancing the convergence, to produce numerous showers and
isolated thunderstorms along the remainder of the ITCZ, south of the
Marshall Islands and Kosrae. The ITCZ looks to remain over the area,
while drifting a bit northward, bringing increased convection to
Kosrae and possibly Pohnpei.

$$

Kleeschulte