439
AXPQ20 PGUM 212343
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
943 AM ChST Tue Apr 22 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 largely disorganized Near Equatorial Trough (NET) enters the region
near 5N130E, extending east-southeast to the Equator near EQ143E,
extending farther east along the Equator and ending near EQ150E well
west of Kapingamarangi. Two distinct but largely disorganized centers
of rotation are observed within said trough, one near 5N130E and the
other near 3N137E. Moderate to occasionally deep convection is
associated with this feature, producing scattered to numerous showers
and some thunderstorms within 150 miles of the centers of the
aforementioned centers of rotation, mainly along the southern and
eastern peripheries that are clashing with the gentle trades
upstream. These vorticity maxes are expected to dissipate under
frictional forces over the next day or so, allowing the NET to take a
much more known shape while spanning much of western Micronesia, with
potential for more embedded disturbances to develop in the second
half of the week as trade-wind convergence strengthens upstream.

TRADE-WIND TROUGHS...
A massive portion of the region is under the influence of diffusion,
with few lackluster trade-wind troughs developing. The more notable
ones are producing scattered showers southwest of Kosrae State,
southwest of Kwajalein, and within an ITCZ-like fragment just
southeast of the Marshalls. These features remain largely transient
in nature, with potential for many more trade-wind troughs to develop
as the aforementioned trade-wind convergence builds across central
and eastern Micronesia.

OTHER SYSTEMS...
A lateral trough is observed along the northwesternmost fringes of
Guam`s AOR, extending eastward between 25N130E and 25N135E well east-
southeast of Naha, Okinawa. Some light showers and widespread
cloudiness is associated with this feature, with strong likelihood of
dissipation overnight as a high pressure cell builds well to the
south near 20N135E over the coming days.

A leading edge of a developing cold front enters the region near
25N156E, extending southwest across Minamitorishima to end near
23N150E. Light showers and widespread cloudiness is associated with
this feature, and remains highly likely to fragment further and
dissipate over the next day or so as a massive low well east of
Hokkaido continues to move toward the Aleutians.

$$

Montvila