788
WHGM70 PGUM 170704
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
504 PM CHST FRI APR 17 2026
PMZ151-152-172100-
/O.CON.PGUM.SE.W.0004.000000T0000Z-260418T0100Z/
/O.CON.PGUM.SC.Y.0039.000000T0000Z-260418T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-
504 PM CHST FRI APR 17 2026
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 11 AM CHST
SATURDAY...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST
SATURDAY...
* WHAT...FOR THE HAZARDOUS SEAS WARNING, VERY STEEP AND HAZARDOUS
SEAS 14 TO 19 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
SATURDAY. FOR THE SMALL CRAFT ADVISORY, UNTIL 5 PM CHST SATURDAY.
* 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 17 FEET WILL
KEEP MARINE CONDITIONS HAZARDOUS UNTIL THIS SATURDAY 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.
PMZ153-154-172100-
/O.CON.PGUM.SE.W.0004.000000T0000Z-260418T0700Z/
/O.CON.PGUM.SC.Y.0039.000000T0000Z-260418T1900Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
504 PM CHST FRI APR 17 2026
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM CHST
SATURDAY...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM CHST
SUNDAY...
* WHAT...FOR THE HAZARDOUS SEAS WARNING, VERY STEEP AND HAZARDOUS
SEAS 17 TO 23 FEET. FOR THE SMALL CRAFT ADVISORY, WEST WINDS
20 TO 30 KT WITH OCCASIONAL GUSTS UP TO 35 KT.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...FOR THE HAZARDOUS SEAS WARNING, UNTIL 5 PM CHST
SATURDAY. 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 HAS NOW MOVED FAR ENOUGH
AWAY FOR WINDS TO FALL BELOW TROPICAL STORM CONDITIONS. COMBINED
SEAS OF 19 TO 23 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.
KLEESCHULTE
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