####018003723####
AXPQ20 PGUM 090206

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

1206 PM ChST Fri May 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...



NEAR EQUATORIAL TROUGH...

A Near Equatorial Trough or NET can be found about 1N130E to EQ153E.

There are two buffer circulations embedded in the NET, the first 

near EQ142E and the other is at the endpoint near EQ153E. Showers 

and thunderstorms can be found near 1N130E, near 2N133E, and a line 

from near 1N140E to EQ142E. Convection around the eastern endpoint 

is producing a small cell thunderstorm, which is expected to move 

out of the area over the course of the day. The second convective 

area is part of a trough extending outward from the  buffer 

circulation near EQ142E. This area is slowly filling in, however, 

the convection remains lackluster. The main concerns with the NET is 

the third area, the line of showers and thunderstorms that are 

building in a northeast direction. Several flashes of lightning have 

been detected in the leading cell. The NET is expected to remain 

fairly stationary over the next few days. 



CONVERGENCE ZONE... 

A convergence zone spans much of Micronesia, expanding from the Date

Line through 130E. Moderate to deep convection is associated with

this feature, which is producing scattered showers near Palau,

numerous to widespread showers and thunderstorms south of Chuuk and

Pohnpei, scattered showers near Kosrae and Majuro, and scattered to

widespread showers in northern RMI and Kwajalein. The showers over

RMI extend northeastward to the Date Line. Overall the stronger

convection is located along the embedded trade-wind trough (more on

that in the next section). This zone is expected to remain over the

region for the next several days. 



TRADE-WIND TROUGHS...

Several trade-wind troughs are embedded within the convergence zone.

The most convective area is near and south of Chuuk. Between the 

convergence zone, a trade-wind trough and a nearby buffer 

circulation, this area is experiencing deep convection. Lightning 

flashes have been detected southeast of Chuuk waters. 



Another trough is passing through Palau waters. Scattered showers 

and isolated thunderstorms are pushing into Palau's waters. This 

trough axis is rather thin and is expected to exit Palau by this 

evening. A few flashes have been seen outside of Palau's waters to 

the southeast. 



These troughs are expected to gradually move westward over the next

several days.



TUTT...

The Tropical Upper Tropospheric Trough or TUTT has an embedded low

that continues to consolidate just outside our region near 26N175E. 

This is producing a trough that extends southwestward to 13N156E. 

Showers and thunderstorms associated with this feature can be found 

near Wake Island and to the southwest of Wake Island. Showers around 

Wake Island itself are isolated to scattered with no thunderstorms. 

The TUTT is expected to remain stationary near Wake Island, as it 

dissipates over the next few days.



OTHER SYSTEMS...

A dissipating front enters the region near 25N149E and extends 

southwestward to 22N130E near Iwo To. Widespread cloudiness and 

scattered showers with a thunderstorm or two are observed near the 

southwestern tip. This feature is expected to continue to evaporate 

as the day progresses.





$$



Bowsher