AXPQ20 PGUM 150136
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1136 AM ChST Wed Apr 15 2026

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...
As of 1100 AM ChST, Typhoon Sinlaku (04W) was centered near 15.7N
145.1E, or 60 miles to the northwest of Tinian and Saipan. Maximum
sustained winds are around 130 mph. Surface observations at Guam
International Airport show continued tropical storm force winds
of 40 to 50 mph with gusts up to 75 mph. Sinlaku is producing
widespread heavy showers over the region with microwave satellite
estimates suggesting 10 to 15 inches of rainfall occurring near
the center of Sinlaku's passage. Sinlaku has shown a slight
increase in forward speed over the last few hours, moving
northwest at around 8 mph. As Sinlaku moves further away from the
Marianas, it is expected to weaken. Typhoon warnings remain in
effect for Rota, Tinian, Saipan, Alamagan, Pagan, and Agrihan.
Then, a Tropical Storm Warning and a Typhoon Watch remain in
effect for Guam.

For more information please refer to bulletins from the Joint
Typhoon Warning Center under WMO header WTPN31 PGTW and from the
National Weather Service under WMO header WTPQ31 PGUM.

...OTHER WEATHER SYSTEMS...

SURFACE TROUGHS AND SURFACE CONVERGENCE...
A surface trough extends southwestward from Sinlaku over Yap
Proper and Koror. Then, it continues southwest and exits the
region near 5N130E. Showers are patchy and isolated along this
area. Another broad trough extends southeast from Sinlaku,
passing to the south of Pohnpei and exiting the region near
EQ163E. Scattered to numerous showers and isolated thunderstorms
are seen with an area of convergence just south of the trough
axis. To the northeast of the trough, showers and thunderstorms
are seen where it interacts with an ITCZ fragment (discussed
below).

OTHER SYSTEMS...
A Westerly Wind Burst (WWB) is located along the far southeastern
to southern portions of Yap State and far southern Chuuk State.
Fresh to strong winds encompass much of eastern Yap State and
western Chuuk State. As Sinlaku curves northwest to north over the
next couple days, these westerlies will begin to subside to
moderate to fresh across southeastern Yap State and southern
Chuuk.

...ITCZ...
A fragment of the Intertropical Convergence Zone (ITCZ) is located
over the central Marshall Islands and extending far to the north-
northwest, where the easterly to east-northeasterly trades
interact with the southeasterlies flowing into TY Sinlaku.
Scattered to numerous showers are seen over much of the
islands/atolls of the RMI. As Sinlaku moves further away, the
ITCZ is expected to diminish and fragment, shifting further north
with its movement.

$$

Bowsher/DeCou