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TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

1052 AM ChST Fri May 2 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...



TROPICAL AND MONSOON DISTURBANCES...

The tropical disturbance numbered 99W has moved out of Micronesia and

into the Philippine Sea east of Mindanao.



The tropical disturbance numbered 90W has moved westward and is now

located near 4N139E. Little improvement in organization has occurred,

still just disorganized fragmented convection minimally wrapping

around the center. Therefore, little in the way of tropical

development is expected through at least the next 24 hours, probably

until it is north and/or west of both Koror Palau and Yap. So,

through Saturday, it is expected to move west-northwest with little

change of intensity.



...OTHER WEATHER SYSTEMS...



NEAR EQUATORIAL TROUGH...

The near-equatorial trough runs from Invest Area 99W to 9N130E to

near Koror Palau at 7N135E to Invest Area 90W at 4N139E. Scattered

showers and isolated thunderstorms are found south and east of both

Koror Palau and Yap Island. This feature is expected to show little

change in either location or intensity through Saturday.



TRADE-WIND TROUGHS...

A trade-wind trough curves from Invest Area 90W near 4N139E to around

14N148E. Scattered showers are observed south and southeast of the

Marianas, with isolated thunderstorms south of 10N. This trough is

forecast to move west or west-northwest with little change of

intensity through Saturday. The northern fringe could just clip Guam

overnight tonight.



Another trade-wind trough stretches from EQ160E to 7N159E. Scattered

showers and a few thunderstorms are affecting southern Chuuk State

and Pohnpei State. This trough is expected to move gradually westward

with little change of intensity.



UPPER-LEVEL TROUGH...

An upper-level trough arches from 12N164E to 25N175E to 25N180.

Widely scattered showers and isolated thunderstorms are noted east of

Wake Island and well north of Majuro.



OTHER SYSTEMS...

A new cold front is pushing down from Asia, and currently cuts from

25N142E to 20N130E. Scattered showers and isolated thunderstorms are

mushrooming along and north of this boundary to beyond 25N, which is

well north of both Koror Palau and Yap Island. This boundary is

forecast to move south and east through Saturday, and could approach

the northernmost of the Mariana Islands.



$$



Stanko