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AXPQ20 PGUM 252032

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

632 AM ChST Fri Apr 26 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 in trade winds extend 

across the region. The first trough/surge is located south and 

east of Palau from near 3N139E and extends north and west to near 

16N133E. Moderate to deep convection is occurring over much of the

Republic of Palau and across southwestern Yap state. Another 

trade trough/surge stretches from southeast of the Marianas near 

13N146E south through eastern Yap state and western Chuuk states 

with pockets of moderate convection. A surge in trade winds is 

pushing across the Marshall Islands and into Kosrae and Pohnpei, 

with pockets of moderate convection as well. A couple of more 

subtle troughs north of 15N are bringing spotty showers and 

convection; one between Wake Island and Minami-Tori-shima 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 south

and east of Palau through Yap, Chuuk, Pohnpei, and Kosrae states 

and the southern 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 the northern islands of the RMI, which 

are still in extreme to exceptional drought.



COLD FRONT/SHEAR LINE

A cold frontal boundary enters the area of responsibility (AOR) 

near 25N180E, stretching west and rounding a strong high pressure

to the north, then curving northwest as a warm front, and exiting

the AOR near 25N168E. A shield of low-topped showers are occurring

along and north of the boundary.



...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 the Republic Palau, through the 

Federated States of Micronesia and the southern Marshall Islands, 

but likely staying south of Yap Proper.



The trade troughs north of 15N will diminish and not bring much, 

if any, impacts to the Marianas or Wake Island.



The cold front will slowly creep south and east and continue to 

wash out, with showers diminishing.



$$



Slagle