159
AXPQ20 PGUM 190038
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1038 AM ChST Wed Jun 19 2024

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...

MONSOON TROUGH...
A monsoon trough enters the region 10N130E, extending southeastward
across Palau to end just south of Ngulu. Moderate convection is
associated with this feature, producing scattered showers and some
thunderstorms near the point of maximum momenta at 10N131E, and in a
convergence zone northwest of Yap. The monsoon trough, being a
result of a former tropical disturbance degrading into an open wave,
is expected to shift northwestward towards the Philippines and allow
a ridge to move in by Thursday night.

DIRTY RIDGE...
A dirty ridge hugs the eastern peripheries of the aforementioned
monsoon trough, extending from Helen`s Reef in southern Palau, east-
northeastward to end south of Sorol in eastern Yap State. Vast
cloudiness is observed across the entirety of the ridge, with some
convection spawning at the buckling point with the incoming trades
near Sorol in eastern Yap State. As mentioned above, this ridge will
follow the monsoon trough closely and weaken through Thursday, before
becoming indiscernible by Thursday night.

TRADE-WIND TROUGHS...
The troughs are difficult to distinguish from the background trade-
wind pattern across Micronesia, being generally short-lived in nature.
The most distinguishable features are producing some showers,
thunderstorms and gusty outflow boundaries southeast of Pohnpei, and
within a convergence zone right near the Equator well west of
Kapingamarangi.

TUTT...
A Tropical Upper-Tropospheric Trough (TUTT) cell is centered near
19N174E well east of Wake Island. Some convection is associated with
this feature, producing a few thunderstorms as it interacts with a
surface feature west-northwest of Kwajalein, and near the Date Line
well east-northeast of Majuro. The TUTT will continue to shift
westward, crossing Wake Island by the weekend and head in the
general direction of the northern Marianas in the first half of next
week.

$$

Montvila