623
WHGM70 PGUM 220648
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
448 PM CHST SUN FEB 22 2026
PMZ153-154-222200-
/O.CON.PGUM.SC.Y.0020.260222T0700Z-260224T0700Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
448 PM CHST SUN FEB 22 2026
..SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST TUESDAY
* WHAT...NORTHEAST WINDS 15 TO 25 KT WITH GUSTS UP TO 30 KT AND
SEAS 8 TO 11 FEET EXPECTED.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...UNTIL 5 PM CHST TUESDAY.
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.
* ADDITIONAL DETAILS...WINDS AND SEAS WILL BEGIN TO RAPIDLY
INCREASE LATE TONIGHT, FROM NORTH TO SOUTH ACROSS THE MARIANAS
AS A SHEAR LINE SHIFTS SOUTHWARD THROUGH THE AREA. COMBINED
SEAS WILL BUILD TO NEAR 11 FEET AROUND MONDAY MORNING AS
SUSTAINED WINDS INCREASE TO AROUND 22 KNOTS. THESE STRONG WINDS
WILL CONTINUE TO PROPAGATE SOUTH ACROSS ROTA AND GUAM WATERS
STARTING AROUND MONDAY EVENING, AND THE SMALL CRAFT ADVISORY
WILL LIKELY BE EXPANDED TO INCLUDE THESE COASTAL ZONES. AFTER A
BRIEF LULL IN HAZARDOUS CONDITIONS TUESDAY, SEAS AND WINDS WILL
RAPIDLY INCREASE TUESDAY NIGHT AS A SIGNIFICANT TRADE-WIND SURGE
BUILDS BEHIND THE SHEAR LINE, REINFORCING THE NORTH-NORTHEAST
SWELL AND WIND WAVES. COMBINED SEAS MAY BEGIN TO REACH 15 FEET
BY WEDNESDAY MORNING AS WINDS BECOME FRESH TO STRONG, WITH
FREQUENT NEAR-GALE TO GALE-FORCE GUSTS POSSIBLE. SEAS AND WINDS
WILL BEGIN TO RELAX BY THE END OF THE WEEK, AFTER A PEAK IN
HAZARDOUS CONDITIONS AROUND WEDNESDAY. HOWEVER, AS SEAS REMAIN
ELEVATED, A SMALL CRAFT ADVISORY MAY NEED TO BE MAINTAINED INTO
THE WEEKEND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
BOWSHER
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