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AXPQ20 PGUM 242354
TWDPQ

Tropical Weather Discussion
National Weather Service Tiyan GU
954 AM ChST Fri Jul 25 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...

TROPICAL CYCLONES...
Tropical Depression 12W has strengthened to Tropical Storm Krosa,
which is now centered near 16.5N 143.3E, or roughly 180 miles
north-northwest of Andersen AFB. This system is forecast to
gradually strengthen to a weak typhoon during the next 48 hours,
turning more to the northeast. This will allow a strengthening
southwesterly monsoon to encompass Guam, the CNMI, and surrounding
waters. Seas will build generally into the 10 to 14 foot range.

For more information please refer to bulletins from the Joint
Typhoon Warning Center under WMO header WTPN31 PGTW and from
the National Weather Service under WMO header WTPQ31 PGUM.

...OTHER WEATHER SYSTEMS...

MONSOON TROUGH...
A weakening monsoon trough extends southeast from 20N130E to
Tropical Storm Krosa. The monsoon flow associated with a tropical
system well northwest of the area has also weakened, with minimal
convection associated with it.

TRADE-WIND TROUGHS...
A trade-wind trough stretches from between Kosrae and Pohnpei
north-northeast to near Wake Island. Widely scattered showers are
developing along this feature.

Another trough stretches from south of Majuro to northeast of
Majuro. Convection has been sparse thus far with this feature.

Both troughs are forecast to continue westward over the next few
days, with the lead trough getting absorbed by the strengthening
tropical system.

TUTT...
A TUTT stretches in a wavy form from 25N180 to a TUTT cell north
of Wake Island, to another cell near 25N150E. Divergence along
the southern flank of this feature is helping increase shower
coverage to scattered from the northern CNMI to south of Wake
between 10N and 18N along a southeastward-pointing divergence
axis. This feature looks to weaken as Tropical Storm Krosa
modifies the pattern the next few days.

$$

Doll