592
AXPQ20 PGUM 070102
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1102 AM ChST Sat Jun 7 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...
A very broad, weak disturbance, Invest 93W, is roughly centered near
14N137E. The center of 93W is ill-defined and very disorganized.
Only patchy clouds and spotty convection is seen with 93W. The next
couple of days, Invest 93W is expected to slowly drift west,
remaining fairly disorganized. Invest 93W will be monitored closely
over the next few days for any changes or indication of
strengthening.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough extends east from a weak circulation just west of
the Philippines, Invest 92W, across 130E near 15N to Invest 93W,
centered near 14N137E, then turns southeast to end near 9N140E.
Scattered to numerous showers and isolated thunderstorms are found
along and south of the trough axis. A weak high pressure center has
developed south of the monsoon trough near 3N138E, with a weak ridge
extending southwest of the center. Monsoon surges are producing
patches of numerous showers and isolated thunderstorms between the
trough and the high pressure center and ridge axis. The trough is
expected to remain quasi-stationary for the next couple of days,
then drift west as Invest 93W moves west-northwest.

TRADE-WIND TROUGHS...
A few trade-wind troughs are evident across the region. The first is
seen east of the Marianas, extending north-northwest from near
10N150E to near 16N148E. The trough is interacting with divergence
associated with the TUTT to produce scattered showers and isolated
thunderstorms across the Marianas. The trough will continue to move
west, maintaining convection over the Marianas through the evening,
then convection will decrease as the trough moves west of the TUTT.

The next trough is seen just east of Weno, Chuuk, extending north-
northeast from near 5N151E to end near 11N154E. Moderate convection
in the form of scattered showers is seen along the trough, just east
of Weno. Convection is expected to increase over Chuuk as the trough
moves slowly west over the next couple of days.

A weak trough is found west of Kwajalein, extending north from near
7N164E to near 12N164E. Only spotty showers are seen along the
trough. Little change is expected as the trough continues west over
the next few days.

The last trough is seen east of Majuro, extending northward from near
7N173E to near 14N175E. Patchy cloudiness and showers are present
with this trough. The trough is expected to strengthen slightly as
it moves west over the next couple of days, with increasing
convection as it moves through the northern Marshall Islands.

TUTT...
A TUTT cell is centered north of the far northern CNMI near 19N144E,
with a trough extending southwest to end near 10N139E. Another trough
extends southeast from the cell to 10N161E, then turns northeast to
another cell centered near 22N180. Scattered to numerous showers and
isolated thunderstorms are found with the TUTT cell and in the area
of divergence southwest of the center. Strong upper-level divergence
that is seen east of the trough that extends southwest from the
cell is interacting with an approaching trade-wind trough to produce
moderate to deep convection in the form of scattered showers and
isolated thunderstorms over and east of the Marianas. Only patchy
clouds and showers are seen along the TUTT that extends southeast
from the cell, with increasing convection evident near the cell
centered near 22N180. This cell and portion of the TUTT is
interacting with a weak circulation and troughing pattern that has
been meandering around the area for the last couple of days to
produce extensive cloudiness, scattered to numerous showers and a few
thunderstorms east of 170E, as far south as 16N. The TUTT and
associated cells will remain quasi-stationary over the coming days
with little change in convection.

OTHER SYSTEMS...
A weak surface circulation is found near 23N173E, with a surface
trough extending southwest to end just east of Wake Island near
19N168E. Another trough extends northeast to beyond the 25N near
179E. This system is interacting with the TUTT and TUTT cell to
produce extensive cloudiness, scattered to numerous showers and a few
thunderstorms east of 170E, as far south as 16N. This system is
expected to continue to meander around the area for the next day or
two before moving east and out of the area, with little change in
cloudiness or convection.

$$

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