118
WHGM70 PGUM 201835
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
435 AM CHST FRI NOV 21 2025
PMZ151>154-210800-
/O.CON.PGUM.SC.Y.0052.251120T2000Z-251122T0800Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-TINIAN COASTAL WATERS-
SAIPAN COASTAL WATERS-
435 AM CHST FRI NOV 21 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 6 AM FRIDAY TO 6 PM
CHST SATURDAY...
* WHAT...EAST WINDS 15 TO 25 KT WITH GUSTS UP TO 30 KT AND SEAS 7 TO
10 FEET EXPECTED.
* WHERE...MARIANAS COASTAL WATERS.
* WHEN...FROM 6 AM FRIDAY TO 6 PM CHST SATURDAY.
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.
* ADDITIONAL DETAILS...A COMBINATION OF ELEVATED EASTERLY SWELL,
SECONDARY NORTHERLY SWELL AND MUCH HIGHER LOCALIZED WIND WAVES, IS
PRODUCING SEA CONDITIONS HAZARDOUS TO SMALL CRAFT BEGINNING FRIDAY
MORNING AND POTENTIALLY LASTING THROUGH AT LEAST SATURDAY
AFTERNOON. ONCE THE PRESSURE GRADIENT BETWEEN THE TROPICS AND THE
MID-LATITUDES DECREASES, WIND WAVES AND EASTERLY SWELL WILL BEGIN
TO DIMINISH, ALLOWING SEAS TO FALL BELOW 10 FEET BY EARLY NEXT
WEEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER VESSELS,
SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
MONTVILA
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