865
AXPQ20 PGUM 090046
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1046 AM ChST Sun Mar 9 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...
It`s a very quiet day across the region. There are a couple of weak
trade-wind troughs found across the area. The first is found well
south of the Marianas near the equator, extending northwest from near
EQ143E to near 5N140E. This trough is interacting with a band of
trade-wind convergence seen near the equator to produce scattered to
numerous showers and isolated thunderstorms within the enhanced
convergence just west of the trough to around 150 miles east of the
trough. The trough will continue to move west along the convergence
band with the enhanced convection moving along with the trough.

The second trough is found just east of Majuro, extending northwest
from near 5N174E to 11N169E. Scattered showers are seen with this
trough to the north of Majuro, northeast of Kwajalein. This trough
and associated convection will move west-southwest over the coming
days.

TRADE-WIND SURGE...
Scatterometer data shows a trade-wind surge over the eastern portion
of the region between 4N and 17N from the Date Line to around 152E.
The surge continues to generate a large trade-wind swell producing
seas in excess of 10 feet across the Marshall Islands. The surge will
continue to weaken through Monday as the pressure gradient eases due
to the transient high pressure system responsible for the surge
continuing to move east away from the area. Another trade-wind surge
is likely later in the week as another strong high pressure system
moves though to the north.

OTHER SYSTEMS...
A weak shear line is evident on satellite stretching west-southwest
from 23N150E to beyond 130E near 17N. Cloudiness with rain and patchy
showers is seen along and around 200 miles north of the shear line.
The shear line looks to drift very slowly south as it continues to
weaken.

A band of trade-wind convergence is seen north of the equator,
extending east from near 2N130E to end near 2N159E. Patchy showers
and a few thunderstorms are found along the band, except where a weak
trade-wind trough is interacting with it. The trough, mentioned
above, is helping generate scattered to numerous showers along and
just north of the convergence band. The band of convergence looks to
weaken over the next day or two as the trough pushes the more active
convection farther west.

A mid-level circulation is seen on the latest visible satellite
data over the northern CNMI near Pagan. The circulation is centered
near 19N146E with associated mid-level troughing extending northward
to end near 20N146E, and extending south-southwest to end near
17N145E. These features are generating scattered showers near and
north of the circulation with scattered to numerous showers found
along the trough. These features look to continue drifting toward the
northwest over the coming days while slowly dissipating.

$$

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