170
AXPQ20 PGUM 040117
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1117 AM ChST Fri Apr 4 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...

NEAR EQUATORIAL TROUGH...
A Near-Equatorial Trough (NET) extends southeast from a weak
circulation centered near 3N130E to end near 1N137E. Extensive
moderate to deep convection is seen with the trough between 2N and
8N, including most of Palau. The NET looks to remain quasi-stationary
over the coming days, maintaining convection across Palau. A trade-
wind trough currently east of Yap and Palau looks to interact with
the NET to enhance convection just south of Koror, Palau within the
next 24 hours.

TRADE-WIND TROUGHS...
Several trade-wind troughs are evident across the region. The first
is seen northeast of the NET, extending northeast from near 4N117E
to 11N142E. Patchy clouds and showers are seen along the trough north
of 8N, with scattered to numerous showers seen south of 8N where the
trough is interacting with converging trade winds. This trough will
continue to move west over the next few days, interacting with the
NET to increase convection just south of Koror, Palau.

Another trough is evident just south of Weno, Chuuk, extending north
from EQ151E to 6N151E. This trough is interacting with a band of
trade-wind convergence to produce scattered to numerous showers
south of Weno, Chuuk. Another trough is seen near Kosrae extending
north from near 1N161E to 7N162E. This trough is interacting with the
same band of convergence, producing scattered showers north and west
of Kosrae to Pohnpei. Two additional troughs are seen over the
Marshalls, one near Kwajalein, the second just east of Majuro. These
troughs are generating convection across the Marshall Islands between
5N and 13N. These troughs will continue to move westward over the
coming days, enhancing convection along the band of convergence.

TRADE-WIND SURGE...
The trade-wind surge north of eastern Micronesia continues to weaken
eastward as the mid-latitude high pressure system that is producing
the stronger winds move farther east. This will continue over the
next few days.

OTHER SYSTEMS...
A weakening cold front crosses into the region near 25N146E,
extending southwest to near 17N137E, where it continues as a shear
line to beyond 130E near 4N. Scattered to numerous showers and
scattered thunderstorms are seen along the cold front north of 20N,
with patchy clouds and showers found along the shear line. The shear
line looks to remain quasi-stationary over the coming days while the
cold front continues to move east. Both features look to weaken,
with decreasing convection expected along the cold front.

A band of trade-wind convergence is seen over Micronesia, stretching
east-southeast from near 8N142E to end near 5N161E. Scattered to
numerous showers and isolated thunderstorms are present along the
band of convergence between 4N and 10N, with enhanced convection seen
where trade-wind troughs are interacting with the convergence. This
feature looks to remain relatively unchanged over the next few days.

$$

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