325
WHMY40 PGUM 150819 AAA
CFWGUM
URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE...UPDATED
NATIONAL WEATHER SERVICE TIYAN GU
619 PM CHST SUN MAR 15 2026
GUZ001-MPZ001>003-152300-
/O.CON.PGUM.SU.W.0002.000000T0000Z-260316T1900Z/
/O.CON.PGUM.CF.A.0001.000000T0000Z-260316T1800Z/
/O.CON.PGUM.RP.S.0009.000000T0000Z-260316T1800Z/
GUAM-ROTA-TINIAN-SAIPAN-
619 PM CHST SUN MAR 15 2026
UPDATED WAVE HEIGHTS AND CORRECTED TYPO IN ADDITIONAL DETAILS.
..HIGH SURF WARNING IN EFFECT UNTIL 5 AM CHST TUESDAY
..COASTAL FLOOD WATCH IN EFFECT THROUGH LATE MONDAY NIGHT
...HIGH RIP CURRENT RISK NOW IN EFFECT THROUGH LATE MONDAY
NIGHT...
* WHAT...LARGE BREAKING WAVES OF 11 TO 14 FEET, ARE EXPECTED TO
BUILD UP TO 16 FEET ALONG NORTH FACING REEFS BY AS EARLY AS MONDAY
MORNING. DANGEROUS RIP CURRENTS. FOR THE COASTAL FLOOD WATCH,
SIGNIFICANT COASTAL FLOODING IS POSSIBLE.
* WHERE...GUAM, ROTA, TINIAN AND SAIPAN.
* WHEN...FOR THE HIGH SURF WARNING, UNTIL 5 AM CHST TUESDAY. FOR
THE COASTAL FLOOD WATCH, THROUGH LATE MONDAY NIGHT. FOR THE HIGH
RIP CURRENT RISK, THROUGH LATE MONDAY NIGHT.
* IMPACTS...SOME ROADS MAY BE CLOSED. LOW LYING PROPERTY MAY BE
INUNDATED. SOME SHORELINE EROSION MAY OCCUR. BREAKING WAVES CAN
SWEEP PEOPLE OFF JETTIES AND DOCKS, AND INTO DANGEROUS SEAS. LIFE-
THREATENING SWIMMING CONDITIONS AND SIGNIFICANT BEACH EROSION CAN
BE EXPECTED. RIP CURRENTS CAN SWEEP EVEN THE BEST SWIMMERS AWAY
FROM SHORE INTO DEEPER WATER.
* ADDITIONAL DETAILS...LATEST ALTIMETRY PASS SHOWS ELEVATED SEA
HEIGHTS FOR THE ISLANDS OF PAGAN NORTHWARD. LOOKING FURTHER NORTH
ON ALTIMETRY, SEA HEIGHTS ARE SHOWING 16 TO 20 FEET. THIS IS DUE TO
STRONG WINDS AROUND A VIGOROUS LOW PRESSURE SYSTEM NEAR JAPAN AND
A KONA LOW THAT IS NORTHWEST OF HAWAI'I, WHICH HAVE BEEN PRODUCING
LONG-PERIOD NNW AND NE SWELLS IN THE REGION. HAZARDOUS SURF AND A
HIGH RISK OF RIP CURRENTS ARE EXPECTED ALONG NORTH AND EAST FACING
REEFS. SURF IS EXPECTED TO BUILD TO AROUND 16 FEET ALONG NORTH
FACING REEFS, THEREFORE, A HIGH SURF WARNING HAS BEEN ISSUED.
ADVISORY LEVEL SURF WILL CONTINUE ALONG EAST FACING REEFS. AS NNW
SWELL BUILDS OVER THE COMING DAYS, IT COULD POTENTIALLY BUILD TO
HAZARDOUS LEVELS OF 9 FEET ALONG WEST FACING REEFS, LIKELY
REQUIRING THE ADVISORY TO BE EXTENDED TO WEST FACING REEFS. THE
COASTAL FLOODING ALONG NORTH FACING REEFS COULD REACH 1 TO 3 FEET.
ONCE THE SEAS CREST AND BEGIN TO FALL, LESSER ADVISORY CONDITIONS
WILL STILL APPLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EVERYONE SHOULD REMAIN OUT OF THE WATER DUE TO LIFE-THREATENING
SURF CONDITIONS. STAY OFF OF JETTIES, PIERS, AND OTHER WATERSIDE
INFRASTRUCTURE.
RIP CURRENTS WILL BE LIFE THREATENING. IF CAUGHT IN A RIP
CURRENT, RELAX AND FLOAT. DON'T SWIM AGAINST THE CURRENT. IF
ABLE, SWIM IN A DIRECTION FOLLOWING THE SHORELINE. IF UNABLE TO
ESCAPE, FACE THE SHORE AND CALL OR WAVE FOR HELP.
BOWSHER
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page