890
WHGM70 PGUM 231853
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
453 AM CHST TUE FEB 24 2026
PMZ151>154-240900-
/O.CON.PGUM.SC.Y.0020.000000T0000Z-260224T1900Z/
/O.CON.PGUM.SE.A.0001.260224T1900Z-260226T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-TINIAN COASTAL WATERS-
SAIPAN COASTAL WATERS-
453 AM CHST TUE FEB 24 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM CHST
WEDNESDAY...
...HAZARDOUS SEAS WATCH REMAINS IN EFFECT FROM LATE TONIGHT
THROUGH THURSDAY AFTERNOON...
* WHAT...FOR THE SMALL CRAFT ADVISORY, EAST WINDS 20 TO 30 KT
WITH GUSTS UP TO 40 KT AND SEAS 9 TO 14 FEET. FOR THE HAZARDOUS
SEAS WATCH, VERY STEEP AND HAZARDOUS SEAS 11 TO 16 FEET POSSIBLE.
* WHERE...MARIANAS COASTAL WATERS.
* WHEN...FOR THE SMALL CRAFT ADVISORY, UNTIL 5 AM CHST WEDNESDAY.
FOR THE HAZARDOUS SEAS WATCH, FROM LATE TONIGHT THROUGH
THURSDAY AFTERNOON.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...WINDS AND SEAS WILL CONTINUE TO INCREASE
FROM NORTH TO SOUTH ACROSS THE MARIANAS AS A SHEAR LINE
GRADUALLY SWEEPS SOUTH AND WEST THROUGH THE AREA. WINDS OF 20 TO
25 KNOTS AND COMBINED SEAS OF 7 TO 10 FEET ARE CURRENTLY
GENERATING ELEVATED, CHOPPY SEA CONDITIONS HAZARDOUS TO SMALL
CRAFT. AFTER A BRIEF LULL TODAY, SEAS AND WINDS WILL RAPIDLY
INCREASE LATE TONIGHT AS A SIGNIFICANT TRADE-WIND SURGE BUILDS
BEHIND THE SHEAR LINE, REINFORCING THE NORTH-NORTHEAST SWELL AND
WIND WAVES. COMBINED SEAS ARE EXPECTED TO REACH 15 FEET OVER
EASTERN PORTIONS OF GUAM AND ROTA WATERS BY WEDNESDAY MORNING AS
STRONG WINDS INCREASE, 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 AT OR EXCEEDING 10
FEET, 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.
DECOU
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