505
AXPQ20 PGUM 200051
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1051 AM ChST Fri Jun 20 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 across the region. The first is
located northwest of Yap from 10N134E to 17N137E. Scattered showers
and isolated thunderstorms are seen along this trough.

The next trough is west of Chuuk near Satawal, or 2N147E to 8N150E.
This trough is interacting with the ITCZ to produce numerous showers
and isolated thunderstorms.

The final trade-wind trough is located near Majuro, or from 6N169E
to 10N171E. Scattered showers and isolated thunderstorms are seen on
the northeast side of the trough. All the trade-wind troughs will
generally move westward over the coming days.

TUTT...
The TUTT enters our region at 24N180 and extends west-southwestward
into a TUTT Cell located at 21N151E. From there, the TUTT extends
westward into a TUTT cell near 20N135E and then westward until it
exits the region at 19N130E. Widespread showers and scattered
thunderstorms are seen where the TUTT interacts with a surface
circulation and the TUTT cell near 21N151E. Scattered showers and
isolated thunderstorms are seen near the TUTT cell near 20N135E. The
TUTT is expected to be bisected by an upper ridge over the next
couple of days with the western half remaining near stationary and
the eastern half strengthening as it moves eastward.

OTHER SYSTEMS...
There is a weak surface circulation located on the edge of our
region just east of Iwo_To or 25N144E. Convergence south of this low
is interacting with the TUTT to produce numerous to widespread
showers and scattered thunderstorms across the far northern CNMI.
This weak circulation is forecasted to redevelop further south, where
it may become a tropical disturbance.

...ITCZ...
The ITCZ remains fragmented with the first entrance into our region
at 3N180 and extends west-northwestward to 9N172E. Numerous showers
are seen near the equator with scattered showers further northwest
where the ITCZ is interacting with a trade-wind trough. The ITCZ re-
enters the region at EQ160E and extends to nearly 10N142E. Numerous
to widespread showers and isolated thunderstorms are seen along the
ITCZ where it is interacting with a trade-wind trough near Satawal.
The ITCZ is expected to fragment into trade-wind troughs over western
Micronesia while it expands over eastern Micronesia the next couple
of days.

$$

Williams