554
WHGM70 PGUM 160508
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
308 PM CHST THU APR 16 2026
PMZ151-161100-
/O.CAN.PGUM.TR.W.4004.000000T0000Z-000000T0000Z/
/O.CAN.PGUM.TY.A.4004.000000T0000Z-000000T0000Z/
/O.NEW.PGUM.SE.W.0004.260416T0508Z-260417T0700Z/
/O.NEW.PGUM.SC.Y.0039.260416T0508Z-260418T0700Z/
GUAM COASTAL WATERS-
308 PM CHST THU APR 16 2026
..HAZARDOUS SEAS WARNING IN EFFECT UNTIL 5 PM CHST FRIDAY
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 5 PM CHST SATURDAY
..TROPICAL STORM WARNING IS CANCELLED
..TYPHOON WATCH IS CANCELLED
* WHAT...FOR THE HAZARDOUS SEAS WARNING, VERY STEEP AND HAZARDOUS
SEAS 12 TO 18 FEET. FOR THE SMALL CRAFT ADVISORY, WEST WINDS 20 TO
30 KT WITH GUSTS UP TO 40 KT.
* WHERE...GUAM COASTAL WATERS.
* WHEN...FOR THE HAZARDOUS SEAS WARNING, UNTIL 5 PM CHST FRIDAY.
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...TYPHOON SINLAKU HAS NOW MOVED FAR ENOUGH AWAY
FOR WINDS TO FALL BELOW TROPICAL STORM CONDITIONS. SEAS WILL BE
SLOWER 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.
PMZ152>154-161100-
/O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/
ROTA COASTAL WATERS-TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
308 PM CHST THU APR 16 2026
..TYPHOON WARNING REMAINS IN EFFECT
* WHAT...TYPHOON WARNING. FOR ROTA, TROPICAL STORM FORCE WINDS TO 40
KT, WITH GUSTS TO 50 KT. SEAS WILL CONTINUE TO SLOWLY SUBSIDE AND
ARE BETWEEN 17 AND 22 FEET. FOR TINIAN AND SAIPAN, TROPICAL STORM
WINDS OF UP TO 50 KT WITH GUSTS TO 65 KT. SEAS ARE NOW SUBSIDING
AND ARE BETWEEN 19 AND 26 FEET.
* WHERE...ROTA, TINIAN, AND SAIPAN COASTAL WATERS.
* WHEN...THROUGH AT LEAST THIS EVENING FOR ROTA, THROUGH AT LEAST
FRIDAY MORNING FOR TINIAN AND SAIPAN.
* IMPACTS...CONDITIONS WILL BE CATASTROPHIC FOR SMALL CRAFT AND
DANGEROUS FOR LARGE VESSELS. REMAIN IN SAFE HARBOR.
* ADDITIONAL DETAILS...TROPICAL STORM WINDS OF 40 KT ARE OCCURRING
FOR NORTHERN ROTA WATERS, DECREASING TO 35 KT OVER SOUTHERN WATERS.
WINDS OF 50 KT ARE CURRENTLY OVER THE NORTHERN WATERS OF TINIAN AND
SAIPAN, WITH 40 KT OVER SOUTHERN WATERS. WINDS AND SEAS WILL
CONTINUE TO DECREASE OVER THE NEXT 24 HOURS. SEAS WILL BE HIGHEST
OVER THE NORTHERN PORTIONS OF THE WATERS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TYPHOON WARNING MEANS SUSTAINED WINDS OF 64 KT OR 74 MPH OR
GREATER ARE EXPECTED OR OCCURRING.
KLEESCHULTE
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