461
WHGM70 PGUM 230710
MWWGUM
URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
510 PM CHST MON FEB 23 2026
PMZ151-152-232115-
/O.EXT.PGUM.SC.Y.0020.260223T0800Z-260224T1900Z/
/O.NEW.PGUM.SE.A.0001.260224T1900Z-260226T0700Z/
GUAM COASTAL WATERS-ROTA COASTAL WATERS-
510 PM CHST MON FEB 23 2026
..SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 5 AM CHST WEDNESDAY
...HAZARDOUS SEAS WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
THURSDAY AFTERNOON...
* WHAT...FOR THE SMALL CRAFT ADVISORY, EAST WINDS 15 TO 25 KT
WITH GUSTS UP TO 35 KT AND SEAS 7 TO 10 FEET EXPECTED. FOR THE
HAZARDOUS SEAS WATCH, VERY STEEP AND HAZARDOUS SEAS 10 TO 15 FEET
POSSIBLE.
* WHERE...GUAM COASTAL WATERS AND ROTA COASTAL WATERS.
* WHEN...FOR THE SMALL CRAFT ADVISORY, UNTIL 5 AM CHST WEDNESDAY.
FOR THE HAZARDOUS SEAS WATCH, FROM LATE TUESDAY NIGHT 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 SOUTHWARD-MOVING SHEAR
LINE GRADUALLY SWEEPS THE AREA. WINDS ARE EXPECTED TO INCREASE TO
AROUND 25 KNOTS TONIGHT AS COMBINED SEAS BUILD, GENERATING
ELEVATED, CHOPPY SEA CONDITIONS HAZARDOUS TO SMALL CRAFT. SEAS AND
WINDS WILL RAPIDLY INCREASE TUESDAY NIGHT 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 WINDS BECOME STRONG, 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, 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.
PMZ153-154-232115-
/O.EXT.PGUM.SC.Y.0020.000000T0000Z-260224T1900Z/
/O.NEW.PGUM.SE.A.0001.260224T1900Z-260226T0700Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
510 PM CHST MON FEB 23 2026
..SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 5 AM CHST WEDNESDAY
...HAZARDOUS SEAS WATCH IN EFFECT FROM LATE TUESDAY NIGHT 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...TINIAN COASTAL WATERS AND SAIPAN COASTAL WATERS.
* WHEN...FOR THE SMALL CRAFT ADVISORY, UNTIL 5 AM CHST WEDNESDAY.
FOR THE HAZARDOUS SEAS WATCH, FROM LATE TUESDAY NIGHT 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 SOUTHWARD-MOVING SHEAR LINE
GRADUALLY SWEEPS THE AREA. WINDS ARE EXPECTED TO SUSTAIN AROUND 25
KNOTS AS COMBINED SEAS BUILD, GENERATING ELEVATED, CHOPPY SEA
CONDITIONS HAZARDOUS TO SMALL CRAFT. SEAS AND WINDS WILL RAPIDLY
INCREASE TUESDAY NIGHT 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 SAIPAN AND TINIAN WATERS BY WEDNESDAY MORNING
AS WINDS BECOME STRONG, 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, 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.
WILLIAMS
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page