Area Forecast Discussion
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FXPQ60 PGUM 221943

Area Forecast Discussion
National Weather Service Tiyan GU
545 AM ChST Sat Sep 23 2017

.Marianas Synopsis...
Scattered clouds and isolated showers prevailed across the
marianas early this morning. Combined seas were mainly 3 to 5


Upper level low pressure was moving away from the area, while a
surface trough to the southeast was moving in. THis trough will
move westward over the weekend. The majority of the rain should
remain south of Guam, however, the trough will be close enough to
bring isolated showers and thunderstorms to the Marianas over the
weekend. Another trough and and upper low moving to the north will
keep the isolated thunderstorms through Monday night. Combined
seas should remain in the 3 to 4 or 3 to 5 foot range for the next
several days.


.Eastern Micronesia...
A surface trough near Chuuk continues to move away from the
region. Clouds have cleared out for the most part at Majuro and
Kosrae, but clouds and a few showers and thunderstorms remain near
Pohnpei. The chance of thunderstorms will gradually diminish
tonight with only isolated showers expected by Sunday. The region
will see fair weather the next day or so before weak trade-wind
convergence and another surface trough bring more clouds and a few
more showers beginning Sunday at Majuro, and Sunday night at
Kosrae and Pohnpei. Drier trades will return around midweek.


.Western Micronesia...
Quiet weather remains at Yap and Koror this morning, but an
approaching trough will bring increasing clouds, showers and
thunderstorms later today at Yap and overnight at Koror. After a
brief lull around Monday, another trough will bring more showers
and thunderstorms to the two locations by Tuesday. At Chuuk, the
bulk of showers has passed now that the trough axis is to the
west. More convection is seen in the area, but most is to the
north. Chuuk could still see a few thunderstorms today. Drier
weather seen to the east will overspread the area by the first of
the week before clouds increase from another surface trough.


Marianas Waters...None.


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