478
FZMY50 PGUM 200607
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
407 PM ChST Sun Apr 20 2025

Marianas Waters out to 40 nautical miles

PMZ150-202145-
407 PM ChST Sun Apr 20 2025

.Synopsis for Marianas Waters...Seas are around 3 to 5 feet this
evening according the latest altimetry and buoy data. Seas are
expected to drop slightly to 3 to 4 feet by Wednesday as the
trade swell subsides slightly. A weak trough is slowly approaching
from the east and will move through the waters Monday, producing
scattered showers, and then exit the waters by Tuesday. Gentle
trade winds are expected to becoming gentle to moderate Wednesday.

$$

PMZ151>154-202145-
MARIANAS COASTAL WATERS-
407 PM ChST Sun Apr 20 2025

.TONIGHT...East wind 10 kt. Seas 3 to 5 ft. Wave Detail: East
4 ft at 8 seconds, east 2 ft at 4 seconds and northeast 2 ft at
10 seconds.
.MONDAY...East wind 10 kt. Seas 3 to 5 ft. Wave Detail: East 4 ft
at 8 seconds, east 2 ft at 4 seconds and northeast 2 ft at
10 seconds. Scattered showers.
.MONDAY NIGHT...East wind 10 kt. Seas 3 to 5 ft. Wave Detail:
East 3 ft at 8 seconds, east 2 ft at 4 seconds and north 2 ft at
9 seconds. Scattered showers Guam and Rota waters.
.TUESDAY...East wind 10 kt. Seas 3 to 5 ft. Wave Detail: East
4 ft at 8 seconds and east 2 ft at 4 seconds.
.TUESDAY NIGHT...East wind 10 kt. Seas around 4 ft. Wave Detail:
East 3 ft at 8 seconds and east 2 ft at 4 seconds.
.WEDNESDAY THROUGH FRIDAY...East wind 10 to 15 kt. Seas 3 to
4 ft. Wave Detail: East 3 ft at 8 seconds and east 2 ft at
4 seconds.

$$