917
WHGM70 PGUM 242015 AAA
MWWGUM
URGENT - MARINE WEATHER MESSAGE...UPDATED
NATIONAL WEATHER SERVICE TIYAN GU
615 AM CHST WED FEB 25 2026
PMZ152-251015-
/O.UPG.PGUM.SE.A.0001.000000T0000Z-260226T0700Z/
/O.EXA.PGUM.SE.W.0001.000000T0000Z-260226T0700Z/
ROTA COASTAL WATERS-
615 AM CHST WED FEB 25 2026
UPDATED TO UPGRADE ROTA TO A HAZARDOUS SEAS WARNING.
..HAZARDOUS SEAS WARNING IN EFFECT UNTIL 5 PM CHST THURSDAY
* WHAT...VERY STEEP AND HAZARDOUS SEAS 11 TO 15 FEET EXPECTED.
* WHERE...ROTA COASTAL WATERS.
* WHEN...UNTIL 5 PM CHST THURSDAY.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...A BROAD, DISORGANIZED SHEAR LINE FRAGMENT
CENTERED NEAR GUAM WATERS CONTINUES TO SWEEP GRADUALLY ACROSS
THE MARIANAS, GENERATING HAZARDOUS TO DANGEROUS CONDITIONS
ACROSS ALL COASTAL WATERS. A HAZARDOUS SEAS WARNING IS NOW IN
EFFECT FOR ROTA COASTAL WATERS, AS MODEL GUIDANCE AND AVAILABLE
BUOY DATA SUPPORT COMBINED SEAS OF 15 FEET OVER EASTERN PORTIONS
OF ROTA COASTAL WATERS. STRONG WINDS WILL CONTINUE, WITH
OCCASIONAL GALE FORCE GUSTS POSSIBLE. SEAS AND WINDS WILL BEGIN
TO RELAX BY THE END OF THE WEEK, BUT CURRENT GUIDANCE INDICATES
A SMALL CRAFT ADVISORY MAY BE NEEDED INTO THE WEEKEND AS SEAS
LOOK TO REMAIN ELEVATED AT OR GREATER THAN 10 FEET.
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.
PMZ153-154-251015-
/O.CON.PGUM.SE.W.0001.000000T0000Z-260226T0700Z/
TINIAN COASTAL WATERS-SAIPAN COASTAL WATERS-
615 AM CHST WED FEB 25 2026
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM CHST
THURSDAY...
* WHAT...VERY STEEP AND HAZARDOUS SEAS 11 TO 15 FEET EXPECTED.
* WHERE...TINIAN AND SAIPAN COASTAL WATERS.
* WHEN...UNTIL 5 PM CHST THURSDAY.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...A BROAD, DISORGANIZED SHEAR LINE FRAGMENT
CENTERED NEAR GUAM WATERS CONTINUES TO SWEEP GRADUALLY ACROSS
THE MARIANAS, GENERATING HAZARDOUS TO DANGEROUS CONDITIONS
ACROSS ALL COASTAL WATERS. A SIGNIFICANT TRADE-WIND SURGE IS
BUILDING BEHIND THE SHEAR LINE, REINFORCING THE NORTH-NORTHEAST
SWELL AND WIND WAVES. A HAZARDOUS SEAS WARNING REMAINS IN EFFECT
FOR TINIAN AND SAIPAN COASTAL WATERS. COMBINED SEAS LOOK TO
EXCEED 15 FEET OVER EASTERN PORTIONS OF SAIPAN AND TINIAN
COASTAL WATERS THIS MORNING AS STRONG WINDS INCREASE, WITH
OCCASIONAL GALE FORCE GUSTS POSSIBLE. SEAS AND WINDS WILL BEGIN
TO RELAX BY THE END OF THE WEEK, BUT CURRENT GUIDANCE INDICATES
A SMALL CRAFT ADVISORY MAY BE NEEDED INTO THE WEEKEND AS SEAS
LOOK TO REMAIN ELEVATED AT OR GREATER THAN 10 FEET.
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.
PMZ151-251015-
/O.CON.PGUM.SE.A.0001.000000T0000Z-260226T0700Z/
GUAM COASTAL WATERS-
615 AM CHST WED FEB 25 2026
...HAZARDOUS SEAS WATCH REMAINS IN EFFECT THROUGH THURSDAY
AFTERNOON...
* WHAT...VERY STEEP AND HAZARDOUS SEAS 11 TO 15 FEET POSSIBLE.
* WHERE...MARIANAS COASTAL WATERS.
* WHEN...UNTIL THURSDAY AFTERNOON.
* IMPACTS...VERY STEEP AND HAZARDOUS SEAS COULD CAPSIZE OR CAUSE
DAMAGE TO VESSELS.
* ADDITIONAL DETAILS...A BROAD, DISORGANIZED SHEAR LINE FRAGMENT
CENTERED NEAR GUAM WATERS CONTINUES TO SWEEP GRADUALLY ACROSS
THE MARIANAS, GENERATING HAZARDOUS TO DANGEROUS CONDITIONS
ACROSS ALL COASTAL WATERS. A SIGNIFICANT TRADE-WIND SURGE IS
BUILDING BEHIND THE SHEAR LINE, REINFORCING THE NORTH-NORTHEAST
SWELL AND WIND WAVES. A HAZARDOUS SEAS WATCH REMAINS IN EFFECT
FOR GUAM COASTAL WATERS. COMBINED SEAS LOOK TO APPROACH 15 FEET
OVER NORTHEASTERN PORTIONS OF GUAM COASTAL WATERS THIS MORNING
AS STRONG WINDS INCREASE, WITH OCCASIONAL GALE FORCE GUSTS
POSSIBLE. SEAS AND WINDS WILL BEGIN TO RELAX BY THE END OF THE
WEEK, BUT CURRENT GUIDANCE INDICATES A SMALL CRAFT ADVISORY MAY
BE NEEDED INTO THE WEEKEND AS SEAS LOOK TO REMAIN ELEVATED AT OR
GREATER THAN 10 FEET.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A HAZARDOUS SEAS WATCH IS ISSUED WHEN THE RISK OF HAZARDOUS SEAS
HAS SIGNIFICANTLY INCREASED...BUT THE SPECIFIC TIMING AND/OR
LOCATION IS STILL UNCERTAIN. IT IS INTENDED TO PROVIDE
ADDITIONAL LEAD TIME FOR MARINERS WHO MAY WISH TO CONSIDER
ALTERING THEIR PLANS.
DECOU
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