135
AXPQ20 PGUM 260116
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1116 AM ChST Wed Mar 26 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 weak tropical disturbance, known as JTWC`s Invest 96W, remains
very disorganized with no discernible low-level circulation visible
in recent infrared or visible satellite imagery. Satellite water
vapor imagery and the CIMSS MIMIC TPW product show the main mid-
level vorticity feature is near 7N130E and slowly drifting west-
northwest, and about to exit the region as it heads toward the
Philippines. New showers and thunderstorms are developing near the
the mid-level vorticity, mainly along 10N from 134E to beyond 130E.
Additional showers and thunderstorms are still seen along north of
the equator to 6N, along the westerly flow that extends from 130E to
about 136E. Across Palau, shower and thunderstorm activity has
decreased especially across the main islands of Palau. Over by Yap,
troughing along with convergence from the trade winds pushing back
into Yap State and into the variable wind flow left in the wake of
96W, are generating scattered showers and isolated thunderstorms
across Yap Proper and extending southward to the equator between 138E
and 143E. 96W is expected exit the region today and allow trade
winds to extend across western Micronesia over the next 24 hours.

...OTHER WEATHER SYSTEMS...

TRADE-WIND TROUGHS...
A couple of weak troughs ahead of the ITCZ, and passing through
southern Chuuk State are generating scattered showers and isolated
thunderstorms, from Chuuk Lagoon to the equator near 144E. These
troughs are expected to shift westward and slowly fade into the
trade-wind flow returning to western Micronesia.

OTHER SYSTEMS...

REMNANTS OF QUASI-STATIONARY FRONT...
An anchored ridge extending east-west across Iwo To and
Minamitorishima, is disintegrating the final remnants of a quasi-
stationary front that spanned across much of the subtropics in the
western Pacific from 130E to the Date Line, within 250 miles of 23N.
Satellite imagery showing most the the thickest cloud cover is mainly
north of Wake Island, with the weak low that developed north of Wake
Island, and thins eastward towards 130E. Showers remain spotty along
the disintegrating front. This feature will continue to evaporate
before becoming discernible westward from Minamitorishima.

...ITCZ...
The series of troughs and the trade-wind surge near Pohnpei have
developed into an ITCZ with scatterometer data showing southeast
winds extending up from the equator and meeting the east-northeast
trade winds along 4N. Numerous showers and isolated thunderstorms
between 2N and 7N from 154E to 167E, across Pohnpei and Kosrae State,
and then shrinking to between 3N and 6N across the southern Marshall
Islands, south of Majuro, and ending near the Date Line.
Scatterometer data shows winds are around 10 to 20 mph across the
ITCZ, but gusts around 30 mph are possible especially within the
deeper convection east of Kosrae. The ITCZ is expected to shift
westward towards Chuuk State, increasing showers at Chuuk and
maintaining the heavier showers and thunderstorms across Kosrae and
Pohnpei States, while the potential for showers slowly decreases
along the southern islands of the Marshall Islands.

$$

Schank