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AXPQ20 PGUM 242030

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

630 AM ChST Thu Apr 25 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/SURGES...

A series of trade-wind troughs and surges extend across the region. 

The first trough is located west of Palau near 130E. A trade 

trough/surge straddles eastern Yap state and western Chuuk state. 

A duo of trade troughs/surges lie between Chuuk and Kosrae. A 

surge in trade winds is pushing into the Marshall Islands. Pockets

of moderate convection are occurring with the troughs/surges. 

Some deeper convection with lightning is occurring where the 

troughs/surges pass through the trade convergence, between the equator

and 9N and 141-172E. A couple of more subtle troughs north of 15N

are bringing spotty showers and convection; one west of Wake 

Island and another just west of the Date Line.



TRADE CONVERGENCE...

Widespread trade convergence is helping produce scattered to 

numerous showers and isolated thunderstorms, stretching from 

eastern Yap state through Chuuk, Pohnpei, Kosrae states and the 

Marshall Islands to across the Date Line. The deepest convection 

is occurring where the trade convergence zone interacts with the 

passing trade troughs/surges. Showers are still struggling to 

reach up to Wotje and other northern islands of the RMI, which are

still in extreme to exceptional drought.



COLD FRONT/SHEAR LINE

A dissipating cold front enters the area of responsibility (AOR)

near 25N160E, stretching southwest and transitioning to a shear

line, washing out northeast of Saipan near 16N150E. Showers are

occurring along the front/shear line, but are diminishing. 



...DISCUSSION...

The trade troughs and surges will continue to push west across

Micronesia through the weekend, interacting with the trade

convergence zone. Expect scattered to at times numerous showers 

and some thunderstorms from Palau through the Federated States of 

Micronesia and the Marshall Islands, but likely staying south of 

Yap Proper.



The trade troughs north of 10N will diminish and not bring much, 

if any, impacts to the Marianas or Wake Island.



The cold front/shear line will continue to wash out with showers 

diminshing.



$$



Slagle