179
AXPQ20 PGUM 110116
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1116 AM ChST Fri Apr 11 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) has retreated farther westward,
extending into the southwest corner of the region near EQ133E and
exiting the region near 2N130E. Moderate to deep convection and a
few thunderstorms are found within 150 miles of the trough axis,
mainly south of 2N. This trough is expected to weaken further and
push westward outside of the region over the next day or two,
being replaced with moderate trade-wind convergence in its wake.

TRADE-WIND TROUGHS...
A few trade-wind troughs in western Micronesia are approaching
and moving north of the NET, generating moderate convection and a
few thunderstorms. One notable trough is moving through Palau,
extending from near 3N135E to 12N131E. Spotty showers are
alongside another trough west of Yap Proper, from 7N137E to
10N136E. Near the Marianas, a couple of troughs are generating a
broad area of scattered showers between 11N and 17N and from 143E
to 153E. Several troughs are embedded within an area of moderate
trade-wind convergence across southern FSM, generating scattered
showers between EQ and 6N and from 134E to 159E. Another area of
trade-wind convergence is found farther east, near the Marshalls
and northern Kiribati, generating a couple areas of scattered
showers between EQ and 8N and from 165E to 173E. Approaching the
northern Marshall Islands is another trough, along with a mid-
level vorticity feature. This is generating widespread cloudiness
and moderate to deep convection between 9N to 15N and from 170E to
178E. These features will continue to propagate westward with
little change in intensity. The troughs near Palau and Yap may
have some interaction with the retreating NET, maintaining showers
in far western Micronesia over the next day or two.

OTHER SYSTEMS...
A weakening cold front crosses into the region near 25N170E and
transitions into a shear line, becoming more fragmented as it
reaches 21N143E. Patchy clouds and showers are found along this
feature. The cold front continues to move east with the shear
line remaining quasi-stationary, but will gradually weaken and
fragment as another frontal system builds in from the west over
the next few days.

$$

IC