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AXPQ20 PGUM 262136

TWDPQ 



Tropical Weather Discussion

National Weather Service Tiyan GU

736 AM ChST Sat Apr 27 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 and Yap Proper from near 7N138E and extends south

and east to EQ146E. Pockets of moderate convection are occurring 

over eastern Republic of Palau and across southwestern Yap state. 

A surge in trade winds is pushing south from northeast Yap state

into and into Chuuk, Pohnpei and Kosrae states, with pockets of 

moderate to deep convection. A couple of more subtle troughs 

north of 15N are bringing spotty showers and convection; one 

approaching Minami-Tori-shima from the east and another near 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 and Yap, through southern Chuuk, Pohnpei, and 

Kosrae states and the southern Marshall Islands, ending near

4N173E. The deepest convection is occurring along leading edge of

trade surge south of Pohnpei and Kosrae from 154E to 168E and 

equator and 6N. 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 east of the Date Line transitions to a

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

23N180E, stretching west and rounding a strong high pressure to 

the north, then curving northwest and exiting the AOR near 

25N160E. 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 shear line will slowly creep south and continue to wash out, 

with showers diminishing.



$$



Slagle