915
FNUS70 PGUM 162328
FWSGUM

Spot Forecast for SE-25-04...NMFS
National Weather Service Tiyan GU
928 AM ChST Thu Jul 17 2025

Forecast is based on forecast start time of 0900 ChST on July 17.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office by email at nws.gum.operations@noaa.gov
if you have questions or concerns with this forecast.

.DISCUSSION...A TUTT cell is seen over the northern CNMI, with the
extending south across the Marianas. Scattered showers and isolated
thunderstorms are found to the north and east of the cell and the
TUTT. These features will continue to drift west, bringing the
increased showers and thunderstorms over the marianas later this
afternoon into the evening. This will maintain increased convection
over the region through Friday. Current model trends keep most of
monsoonal pattern west of the Marianas, but as the near-equatorial
trough in western Chuuk State lifts northward towards the Marianas
as a surface trough, still expect a wetter pattern for the weekend.
However, showers are expected to be episodic in nature, where there
may be periods of showery weather followed by more sunshine. Winds
remain gentle to moderate with some gusty winds near heavier showers.
West to southwest swell will build across the Marianas over the next
few days.

.THURSDAY (ZEALANDIA BANK)...

Sky/weather.........Partly sunny (40-50 percent). Isolated showers
                    and thunderstorms.
Surface winds (kts).East winds 10 to 15 knots.
Wave heights........4 to 6 feet.

.THURSDAY NIGHT (ZEALANDIA BANK)...

Sky/weather.........Mostly cloudy (45-55 percent). Scattered
                    showers and isolated thunderstorms.
Surface winds (kts).East winds 10 to 15 knots.
Wave heights........4 to 6 feet.

.FRIDAY (SARIGAN ISLAND)...

Sky/weather.........Partly sunny (45-55 percent). Scattered showers
                    and isolated thunderstorms.
Surface winds (kts).Southeast winds 10 to 11 knots.
Wave heights........4 to 6 feet.

$$
Forecaster...KK
Requested by...Benjamin Richards
Type of request...MARINE
.TAG 2518140.0/GUM
.DELDT 07/17/25
.FormatterVersion 2.0.0
.EMAIL benjamin.richards@noaa.gov