955
AXPQ20 PGUM 210049
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1049 AM ChST Sat Jun 21 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...
Newly designated JTWC Invest 95W is currently located near
21N145.5E. Invest 95W is a sub-low and significant development into a
tropical cyclone is not expected in the next 24 hours. Numerous
showers and isolated thunderstorms are located near the circulation
and to the south and east of the center. Invest 95W is expected to
slowly move north-northwest the next couple of days, bringing
unsettled weather to the far northern CNMI. Little to no impacts are
expected for Saipan and further south with this system.

...OTHER WEATHER SYSTEMS...

TRADE-WIND TROUGHS...
There are a few trade-wind troughs across the region. The first is
seen from Yap Proper and to the south, stretching from 10N138E to
5N137E where it intersects a Near Equatorial Trough (NET). Numerous
showers and isolated thunderstorms are seen along the southern end of
the trough where it is interacting with the NET.

The second trough is located across eastern Chuuk state west of
Pohnpei, or from 6N155E to 9N157E. This trough is interacting with
the ITCZ to produce scattered showers and isolated thunderstorms.

The last trough is located across Kwajalein and the western RMI, or
from 6N164E to 10N167E. This trough is interacting with the ITCZ to
produce numerous showers and isolated thunderstorms across Kwajalein.
These troughs will general move westward over the coming days,
remaining embedded within the developing ITCZ.

TUTT...
The TUTT enters our region at 21N180 and stretches generally
westward until it diverges at 20N166E. The smaller stretch of the
TUTT then turns southward down to 10N164E. This part of the TUTT is
likely interacting with a trade-wind trough and the ITCZ to produce
numerous showers over Kwajalein. The main TUTT continues generally
westward before running into a TUTT cell located at 20N140E. The TUTT
then splits again with a northern portion that exits our region at
25N140E and a western portion that exits our region at 18N130E. The
only active portion of the TUTT appears to be along 20N east of 150E,
where the TUTT is interacting with a surface trough extending east
of Invest 95W. Numerous showers and isolated thunderstorms are seen
along this portion of the TUTT. The TUTT is expected to be bisected
by an upper level ridge moving near 20N150E with a new TUTT cell
developing to the east of the ridge.

NEAR EQUATORIAL TROUGH (NET)...
The NET extends from 8N134E to EQ139E. The NET is interacting with a
trade-wind trough to produce numerous showers and isolated
thunderstorms over Palau and to the south and east. The NET is
forecasted to move out of the region over the next day or two.

...ITCZ...
The ITCZ generally stretches from EQ180 to 9N150E. Scattered to
numerous showers are seen along the ITCZ where a couple of trade-wind
troughs interacted. The ITCZ is expected to fragment into trade-wind
troughs west of 155E, while it continues to develop east of 155E
over the coming days.

$$

Williams