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AXPQ20 PGUM 282040

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

640 AM ChST Mon Apr 29 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...



None.



...OTHER WEATHER SYSTEMS...



TRADE-WIND TROUGHS...

A series of trade-wind troughs and surges in trade winds extend 

across the region. The first trough/surge that pushed across Palau

yesterday and brought gusty winds and heavy downpours, extends

from the Equator to 18N and pushing near 130E as it heads west 

towards the Philippines. Another trade trough extends from near

Kwajalein north over Wake Island and exiting the AOR near 25N166E. 

with shallow showers and spotty convection. Other troughs and

surges in trade winds are pushing across Micronesia and

interacting with the convergence zone, enhancing convection. A

more defined trough/surge is working out of western Chuuk state

into eastern Yap state, with moderate to deep convection.



OTHER SYSTEMS...



FRONTAL BOUNDARY/SHEAR LINE...

A persistent frontal boundary east of the Date Line transitions 

to a shear line and enters the area of responsibility (AOR) near 

21N180E, stretching west and rounding high pressure, then curving

northwest and exiting the AOR near 25N167E. A shield of low-

topped showers are occurring along and north of the boundary.



ITCZ/TRADE CONVERGENCE ZONE...

The Inter-Tropical Convergence Zone (ITCZ) begins south of Palau

and Yap Proper near the Equator at 138E and extends east northeast

to south of Pohnpei Proper near 3N158E, where it transitions to a

zone of trade convergence and extends east across Kosrae and the

southern Marshall Islands, exiting the AOR near 5N180. Moderate to

deep convection is occurring along and north of the convergence

zone, from 142E to past the Date Line and the Equator to 8N.



...DISCUSSION...

The trade troughs and surges will continue to push west across

Micronesia, interacting with the trade convergence zone/ITCZ and

enhancing convection. Expect scattered to at times numerous 

showers and some thunderstorms from the Republic Palau, through 

the Federated States of Micronesia and the southern Marshall 

Islands, but likely staying south of Yap Proper. The trough near

Kwajalein and Wake Island will diminish and not bring much in the

way of impacts. The trough/surge pushing out of Chuuk state is 

projected to bring moderate to deep convection and gusty winds 

across southern Yap state and then likely staying south of the 

main islands of Palau, before exiting the AOR on Wednesday.



The shear line will slowly creep south and continue to wash out, 

with showers diminishing.



$$



Slagle