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AXPQ20 PGUM 202025

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

625 AM ChST Sun Apr 21 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...



TROPICAL DISTURBANCE...

Ascat wind analysis indicates a tropical disturbance is centered 

roughly near 5N160E; embedded in a surface troughing pattern seen

extending over Pohnpei State. This is part of a larger area across

Chuuk, Pohnpei and Kosrae states where surface winds are converging

under an area of upper level divergence.



The surface trough extends farther north from 5N160E over Enewetak

Atoll to 14N162E. Satellite shows a convective complex of heavy

showers and thunderstorms just moving over the Weno Chuuk area

this morning. Also, showers and thunderstorms continue to develop

in an area from near Pohnpei northward across Enewetak.



...OTHER WEATHER SYSTEMS...



NEAR EQUATORIAL TROUGH...

The remnants of a NET have moved mostly west of 130E this morning.



TRADE-WIND TROUGHS...

A trade-wind trough over southeast Yap State curves from 7N142E 

to 2N144E. Scattered showers and a few thunderstorms are found 

within about 50 miles of this trough.



Another trade-wind trough along with converging surface winds seen

over the Marshall Islands curves from 9N171E to near Butaritari at

4N176E. Widespread clouds and patchy showers are occurring over 

the Marshall Islands, but mainly south of 10N.



OTHER SYSTEMS...

A weak cold front northwest of Wake Island extends from 25N160E 

to 20N150E then runs westward as a shear line along 20N north of

the Mariana Islands to about 20N140E. Clouds and patchy showers 

are seen along and up to 50 miles north of this front.



...DISCUSSION...

The tropical disturbance is poorly organized and should drift 

slowly westward, but it has not been moving much recently. It 

will likely continue to cause unsettled weather over much of 

Micronesia the next few days. 



The trough over southeast Yap State is moving westward and will 

cause showers at times for Palau and to a lesser degree near and 

north of Yap for the next couple days. 



The trade-wind trough over the Marshall Islands is edging slowly 

westward. It should produce much needed rainfall for Majuro and 

some of the other islands, but only a few light showers are 

expected along and north of 10N.



$$



Simpson