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AXPQ20 PGUM 250039

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

1039 AM ChST Fri Apr 25 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...



NEAR EQUATORIAL TROUGH...

A developing Near Equatorial Trough (NET) enters the region near 

5N130E, extending east-southeast to an embedded disturbance near

4N132E, to then extend farther east-southeast to end near EQ145E

in southeast Yap State. Moderate to occasionally deep convection 

is associated with this feature, producing scattered to numerous 

showers and some thunderstorms within 150 miles of the center of 

the aforementioned disturbance, and mainly south of the trough 

axis well south of Palau. This feature is expected to continue to

develop slowly while remaining in the general vicinity, with the

center of rotation moving out of Guam's AOR sometime early next

week.



TRADE-WIND TROUGHS...

A broad surface trade-wind trough extends from 9N150E west of

Chuuk, south-southwestward across much of eastern Yap State to end

at the Equator near EQ147E. Moderate to occasionally deep

convection is associated with this feature, producing scattered to

numerous showers and a few thunderstorms in a large sector from 

143E to 152E, between 9N and the Equator. This feature is expected

to develop into a much more substantial convergence zone that will

span much of central and eastern Micronesia as early as Sunday,

becoming more active upstream for much of next week.



Other (albeit less active) surface troughs are observed elsewhere.

One is located well east-southeast of Wake Island, producing

scattered showers and some thunderstorms while interacting with a

slanted Tropical Upper-Tropospheric Trough (TUTT). Other troughs

are producing scattered showers east of Kosrae and across much of

the Marshalls. These features are expected to remain transient of

nature for the next several days, as they continue moving along

with the trades.



TUTT...

A laterally-positioned Tropical Upper-Tropospheric Trough (TUTT)

enters the region near 24N180, extending west-northeast to 25N170E

before taking a sharp turn southwest to a vorticity max near

21N164E west-northwest of Wake Island. Moderate convection is

associated with this feature, producing scattered showers and some

thunderstorms near the vorticity max zone as it interacts with

surface troughs. This feature is expected to meander in the

general vicinity while the trough axis sharpens over the next

several days, followed by an embedded low developing northeast of

Wake Island sometime early next week.



$$



Montvila