682
WHGM70 PGUM 180753
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
553 PM CHST SUN OCT 18 2026
PMZ151-152-182200-
/O.CAN.PGUM.TY.W.4029.000000T0000Z-000000T0000Z/
/O.NEW.PGUM.SE.W.0008.261018T0753Z-261019T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-
553 PM CHST SUN OCT 18 2026
..HAZARDOUS SEAS WARNING IN EFFECT UNTIL 5 PM CHST MONDAY
..TYPHOON WARNING IS CANCELLED
* WHAT...VERY STEEP AND HAZARDOUS SEAS 12 TO 16 FEET AND SOUTHEAST
WINDS 20 TO 30 KT WITH OCCASIONAL GUSTS TO 40 KT.
* WHERE...GUAM AND ROTA COASTAL WATERS.
* WHEN...UNTIL 5 PM CHST MONDAY.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...TYPHOON AND TROPICAL STORM CONDITIONS ARE NO
LONGER EXPECTED AS TYPHOON CHAMPI CONTINUES MOVING AWAY FROM THE
REGION. HOWEVER, COMBINED SEAS WILL BE VERY STEEP DUE TO REMNANT
STORM-INDUCED SWELLS AND ELEVATED WIND WAVES. AS CHAMPI CONTINUES
MOVING AWAY AT A RELATIVELY QUICK SPEED, SEAS COULD DROP BELOW 15
FEET AFTER MIDNIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A HAZARDOUS SEAS WARNING MEANS HAZARDOUS SEA CONDITIONS ARE
IMMINENT OR OCCURRING. RECREATIONAL BOATERS SHOULD REMAIN IN
PORT...OR TAKE SHELTER UNTIL WAVES SUBSIDE. COMMERCIAL VESSELS
SHOULD PREPARE FOR ROUGH SEAS AND CONSIDER REMAINING IN PORT OR
TAKING SHELTER IN PORT UNTIL HAZARDOUS SEAS SUBSIDE.
PMZ153-154-182200-
/O.CON.PGUM.SC.Y.0076.000000T0000Z-261019T0700Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
553 PM CHST SUN OCT 18 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST
MONDAY...
* WHAT...SOUTHEAST WINDS 20 TO 30 KT WITH OCCASIONAL GUSTS UP TO 40
KT AND SEAS 10 TO 14 FEET.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...UNTIL 5 PM CHST MONDAY.
* IMPACTS...CONDITIONS WILL BE HAZARDOUS TO SMALL CRAFT.
* ADDITIONAL DETAILS...AS SUPER TYPHOON CHAMPI CONTINUES MOVING AWAY
FROM THE MARIANAS, ELEVATED SWELLS AND WIND WAVES WILL PERSIST,
MAKING COMBINED SEAS AND WINDS HAZARDOUS TO SMALL CRAFT THROUGH
MONDAY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
INEXPERIENCED MARINERS, ESPECIALLY THOSE OPERATING SMALLER
VESSELS, SHOULD AVOID BOATING IN HAZARDOUS CONDITIONS.
MESA
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