501
WHGM70 PGUM 171804
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
404 AM CHST SAT APR 18 2026
PMZ151-152-180700-
/O.CON.PGUM.SE.W.0004.000000T0000Z-260418T0100Z/
/O.CON.PGUM.SC.Y.0039.000000T0000Z-260418T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-
404 AM CHST SAT APR 18 2026
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 11 AM CHST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST THIS
AFTERNOON...
* WHAT...FOR THE HAZARDOUS SEAS WARNING, VERY STEEP AND HAZARDOUS
SEAS 12 TO 16 FEET. FOR THE SMALL CRAFT ADVISORY, WEST WINDS
15 TO 25 KT WITH GUSTS UP TO 30 KT.
* WHERE...GUAM AND ROTA COASTAL WATERS.
* WHEN...FOR THE HAZARDOUS SEAS WARNING, UNTIL 11 AM CHST
TODAY. FOR THE SMALL CRAFT ADVISORY, UNTIL 5 PM CHST TODAY.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...HAZARDOUS MARINE CONDITIONS CONTINUE IN
THE WAKE OF TYPHOON SINLAKU. COMBINED SEAS OF 12 TO 16 FEET WILL
KEEP MARINE CONDITIONS HAZARDOUS UNTIL THIS MORNING. SEAS WILL
BE SLOW TO SUBSIDE AND SMALL CRAFT ADVISORY WINDS WILL CONTINUE
INTO THE WEEKEND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
PMZ153-154-180815-
/O.CON.PGUM.SE.W.0004.000000T0000Z-260418T0700Z/
/O.CON.PGUM.SC.Y.0039.000000T0000Z-260418T1900Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
404 AM CHST SAT APR 18 2026
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM CHST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM CHST
SUNDAY...
* WHAT...FOR THE HAZARDOUS SEAS WARNING, VERY STEEP AND HAZARDOUS
SEAS 15 TO 20 FEET. FOR THE SMALL CRAFT ADVISORY, WEST WINDS
20 TO 25 KT WITH OCCASIONAL GUSTS UP TO 35 KT.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...FOR THE HAZARDOUS SEAS WARNING, UNTIL 5 PM CHST
TODAY. FOR THE SMALL CRAFT ADVISORY, UNTIL 5 AM CHST SUNDAY.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...TYPHOON SINLAKU CONTINUES TO MOVE FAR AWAY.
COMBINED SEAS OF 15 TO 20 FEET WILL KEEP MARINE CONDITIONS
HAZARDOUS UNTIL LATE SATURDAY AFTERNOON. SEAS WILL BE SLOW TO
SUBSIDE AND SMALL CRAFT ADVISORY WINDS WILL CONTINUE INTO THE
WEEKEND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
WILLIAMS
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