045
WHMY40 PGUM 180753
CFWGUM
URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
553 PM CHST SUN OCT 18 2026
GUZ001-MPZ001-181800-
/O.CAN.PGUM.CF.W.0003.000000T0000Z-261018T1800Z/
/O.CAN.PGUM.SU.W.0009.000000T0000Z-261018T1800Z/
/O.EXA.PGUM.SU.Y.0058.000000T0000Z-261018T1800Z/
/O.EXA.PGUM.RP.S.0023.000000T0000Z-261018T1800Z/
GUAM-ROTA-
553 PM CHST SUN OCT 18 2026
..HIGH SURF ADVISORY IN EFFECT UNTIL 4 AM CHST MONDAY
..HIGH RIP CURRENT RISK IN EFFECT UNTIL 4 AM CHST MONDAY
...COASTAL FLOOD WARNING IS CANCELLED...
..HIGH SURF WARNING IS CANCELLED
* WHAT...FOR THE HIGH SURF ADVISORY, LARGE BREAKING WAVES OF 10 TO
14 FEET IN THE SURF ZONE. FOR THE HIGH RIP CURRENT RISK, DANGEROUS
RIP CURRENTS.
* WHERE...SOUTH AND WEST FACING REEFS OF GUAM AND ROTA.
* WHEN...UNTIL 4 AM CHST MONDAY.
* IMPACTS...DANGEROUS SWIMMING AND SURFING CONDITIONS AND
LOCALIZED BEACH EROSION. RIP CURRENTS CAN SWEEP EVEN THE BEST
SWIMMERS AWAY FROM SHORE INTO DEEPER WATER.
* ADDITIONAL DETAILS...AS SUPER TYPHOON CHAMPI CONTINUES MOVING AWAY
FROM THE REGION, SURF HAS FALLEN BELOW LIFE-THREATENING LEVELS BUT
WILL REMAIN HAZARDOUS AT LEAST THROUGH TONIGHT. IN ADDITION, STORM-
INDUCED COASTAL INUNDATION AND SIGNIFICANT COASTAL EROSION ARE NO
LONGER EXPECTED. EVEN SO, MINOR WAVE RUN-UP CAN STILL OCCUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RIP CURRENTS WILL BE LIFE THREATENING. INEXPERIENCED SWIMMERS
SHOULD REMAIN OUT OF THE WATER DUE TO DANGEROUS SURF CONDITIONS.
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.
MPZ002-003-181800-
/O.CON.PGUM.SU.Y.0058.000000T0000Z-261018T1800Z/
/O.CON.PGUM.RP.S.0023.000000T0000Z-261018T1800Z/
TINIAN-SAIPAN-
553 PM CHST SUN OCT 18 2026
..HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM CHST MONDAY
...HIGH RIP CURRENT RISK REMAINS IN EFFECT UNTIL 4 AM CHST
MONDAY...
* WHAT...FOR THE HIGH SURF ADVISORY, LARGE BREAKING WAVES OF 9 TO 12
FEET IN THE SURF ZONE. FOR THE HIGH RIP CURRENT RISK, DANGEROUS RIP
CURRENTS.
* WHERE...EAST AND SOUTH FACING REEFS OF TINIAN AND SAIPAN.
* WHEN...UNTIL 4 AM CHST MONDAY.
* IMPACTS...DANGEROUS SWIMMING AND SURFING CONDITIONS AND
LOCALIZED BEACH EROSION. RIP CURRENTS CAN SWEEP EVEN THE BEST
SWIMMERS AWAY FROM SHORE INTO DEEPER WATER.
* ADDITIONAL DETAILS...SIGNIFICANT AND DOMINANT SOUTH-SOUTHWESTERLY
SWELL GENERATED BY DISTANT TYPHOON CHAMPI (29W) AND SECONDARY
NORTHEASTERLY SWELL GENERATED BY DISTANT REMNANTS OF KOGUMA AND
ASSOCIATED FRONTAL SYSTEMS WILL PRODUCE HAZARDOUS SURF AND
DANGEROUS RIP CURRENTS ALONG EAST AND SOUTH FACING REEFS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RIP CURRENTS WILL BE LIFE THREATENING. INEXPERIENCED SWIMMERS
SHOULD REMAIN OUT OF THE WATER DUE TO DANGEROUS SURF CONDITIONS.
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.
MESA
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