855
AXPQ20 PGUM 300111
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
1111 AM ChST Thu Jul 30 2026

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...

TROPICAL CYCLONES...
Super Typhoon Dolphin continues to slowly strengthen as it moves NW.
STY Dolphin is centered near 16.0N 166.3E, moving NW at 12 mph.
Maximum sustained winds have increased to 165 mph as Dolphin passes
S of Wake Island. Latest satellite imagery displays a well defined
eye, showing that Dolphin made a splendid recovery from its eyewall
replacement cycle. Widespread heavy showers are found within 120
miles of the center of STY Dolphin, with scattered thunderstorms
concentrated within the eyewall. A feeder band wraps around Dolphin,
extending W from near 19N180 to 22N168E to turning SSW to 16N163E.
Scattered to numerous showers and isolated thunderstorms are found
within the feeder band up to 350 miles from the center. STY Dolphin
remains in an area of very favorable conditions for continued
development and is expected to continue to slowly strengthen over
the next couple of days before it begins to weaken.

For more information on STY Dolphin, please refer to bulletins
issued by the Joint Typhoon Warning Center under WMO header WTPN31
PGTW and by the National Weather Service under WMO header WTPQ31
PGUM.

TROPICAL AND MONSOON DISTURBANCES...
A weak circulation, Invest 94W, remains SW of Guam, NE of Yap
Proper, centered near 12.8N 140.3E. 94W is drifting slowly W, with
little change in intensity. Little convection is found with Invest
94W except to the WSW along the monsoon trough N of Yap Proper,
where numerous showers and a few thunderstorms are found with
enhanced convergence leading into 94W. This invest is helping to
fuel a weak monsoon surge across Palau and far western Yap State.
Invest 94W will continue to slowly drift W, maintaining enhanced
winds to the S of the monsoon trough over Palau and Yap Proper. No
change in intensity is expected.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
The monsoon trough enters the region near 12N130E, extending E to
Invest 94W. The trough then continues ENE into STY Dolphin, then
turns SE to beyond the Date Line near 8N. Over the W portion of the
monsoon trough, Invest 94W is helping to enhance a weak monsoon
surge over Palau and western Yap State, resulting in scattered to
numerous showers and isolated thunderstorms from N of Koror, Palau to
beyond 130E. Farther E, increasing convergence S of the trough is
producing scattered to numerous showers and isolated thunderstorms
SE of Guam, across western Chuuk State to Weno. STY Dolphin is
producing a monsoon surge across portions of eastern Micronesia from
Pohnpei State across the southern Marshall Islands. Scattered
showers and isolated thunderstorms are found across Pohnpei, Kosrae
and the Marshall Islands within the surge. Enhanced convergence N of
the monsoon trough, SE of STY Dolphin, is producing a band of
scattered showers and isolated thunderstorms well E of Wotje and
Utirik. W of 155E, the monsoon trough looks to remain quasi-
stationary with little change in intensity, though Invest 94W will
slowly drift W and maintain a weak monsoon surge W of 140E. E of
155E, STY Dolphin will continue to pull the monsoon trough a bit
farther N while maintaining a monsoon surge across eastern
Micronesia that should spread into Chuuk State over the next 24
hours. Little change in intensity is expected over the next couple
of days.

TRADE-WIND TROUGHS...
A trade-wind trough extends N from Invest 94W to end near 23N139E.
Scattered showers are found W of the trough over the S portion of
the trough, with little convection seen northward. Another area of
scattered showers and isolated thunderstorms is found N of 20N. The
trough will continue to slowly move W with little change in
intensity.

Another weak trade-wind trough is found between Iwo To and Minami
Torishima, extending NNE from near 21N148E to beyond 25N near 149E.
Enhanced convection with this trough is generating scattered showers
and isolated thunderstorms N of 22N. The trough will continue
progressing W with little change in intensity.

$$

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