538
AXPQ20 PGUM 240032
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
Issued by National Weather Service Honolulu HI
1032 AM ChST Tue Jun 24 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 CYCLONES...
Tropical Storm Sepat (02W) continues to move quickly to the
northwest, now with sustained winds of 40 mph. Sepat has moved out of
the Guam AOR and is not expected to have any additional effects in
the AOR. For more information on TS Sepat, please refer to bulletins
from the Joint Typhoon Warning Center under WMO header WTPN31 PGTW.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough extends across the central-northern Philippines,
passing through 15N130E before curving northeastward and passing
through a broad and weak circulation near 21N134E. It then continues
up to TS Sepat near 29N141E. While the trough axis itself is
generally devoid of convection, thunderstorms continue to flare
north of 20N between 135E and 138E due to the presence of a well-
defined upper-level low centered near 23N136E. Widespread heavy
showers and thunderstorms are found in the convergent southerly
monsoon flow east of the monsoon trough axis. This area stretches
from the Palau-Yap area up to Iwo To Island, just west of the
Marianas Island chain. This convection will drift WNW the next couple
of days while gradually diminishing. Southwest winds over Yap and
Palau will hover between 10 and 15 mph the next few days.

SURFACE TROUGH...
A surface trough just NW of Chuuk and trailing convergent ESE flow
across Pohnpei and Kosrae are generating widespread showers and a few
thunderstorms just NE of Chuuk and across much of eastern Pohnpei
State and over much of Kosrae State. Overnight scatterometry showed
10-15 mph winds with patches of 20-25 mph winds. This convection will
gradually head west, maintaining a wet pattern and bringing occasional
strong gusts to both Pohnpei and Kosrae the next couple of days.

ITCZ...
The ITCZ has shifted a little farther south, extending along 3N
eastward from 165E. Showers and a few thunderstorms are found along
the ITCZ axis with 15-20 mph winds. ITCZ convection is expected to
decrease by midweek, occasionally flaring in coverage with gusts to
25 mph, mainly north of the axis, with little change in the location
of the ITCZ axis.

$$

Aydlett