208
AXPQ20 PGUM 190056
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1056 AM ChST Sun Jan 19 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...
There are a few trade-wind troughs evident across the region. The
first is seen near Kosrae, extending northwest from near 5N166E to
9N162E. Scattered moderate to deep convection is seen southwest of
the trough. The next trough is near Weno, Chuuk, extending northwest
from 4N156E to 9N153E. Spotty moderate to deep convection is also
seen southwest of this trough. A third trough is seen farther north,
east of the Marianas, extending northeast from near 12N153E to
17N157E. Patchy clouds and light showers are seen ahead of this
trough. Another trough is present southeast of Guam, extending
north-northeast from near 8N145E to 13N157E. Scattered showers are
seen along this trough. The last trade-wind trough is located near
Yap Proper, east of Koror, Palau, extending north-northeast from near
5N136E to 11N138E. Only patchy clouds with light showers are
associated with this trough. The series of trade-wind troughs will
continue to progress westward with little change in intensity
expected over the next few days.

TRADE-WIND SURGE...
The trade-wind surge has weakened significantly west of the Marshall
Islands continues to move east, past the Date Line. Fresh to strong
winds remain across the Marshalls eastward to beyond the Date Line.
The surge will continue to slowly weaken eastward as the mid-latitude
high pressure system moves farther east. However, a resurgence is
expected later in the week as another, stronger, high pressure system
tracks east from Japan.

OTHER SYSTEMS...
A front extends southwest across 25N161E through a weak circulation
centered near 23N157E, then transitions into a shear line near
20N150E. The shear line continues west-southwest to beyond 15N130E.
Patchy clouds, rain and showers are found north of these features.
The front and circulation will continue to move slowly east and
weaken while the shear line remains quasi-stationary.

$$

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