765
AXPQ20 PGUM 090019
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1019 AM ChST Tue Dec 9 2025

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...

NEAR EQUATORIAL TROUGH...
The NET has shifted south today as expected. It enters Guam`s AOR
at 3N130E and extends east in a wavy form to 5N145E, then east-
southeast to a buffer circulation 1N162E, ending at Eq165E. Only
spotty (very isolated) showers are developing near and south of
this feature between 130E and 156E. East-southeast of there along
the NET, and especially near the circulation, numerous showers and
isolated thunderstorms are occurring. The NET looks to remain near
it`s current location with a similar convective behavior
anticipated the next few days.

TRADE-WIND SURGE...
The trade-wind surge has expanded south today, with mainly 15 to
20 knot winds (with smaller/isolated pockets of 20 to 25 knot
winds) centered between 1N and 9N, east of 172E. Altimetry shows
seas of 6 to 9 feet are common in this area. This pattern looks to
continue the next few days as well.

OTHER SYSTEMS...
An upper low continues to straddle the Date Line as it slowly
lifts north. Showers are found between between 9N and 18N, east
of 176E, around the periphery of the low. The tail end of this
trough is also fostering scattered to locally numerous shower
development, mainly between the equator and 3N from 162E to the
Date Line and beyond. This is where the ends of the mid-level
trough and the eastern extent of the NET interact, with the trough
providing good divergence aloft, aiding in convecting
development/coverage.

Both the trough and upper low will move east and northeast
respectively over the next few days, allowing for divergence and
shower coverage to diminish.

$$

Doll