645
WHMY40 PGUM 070555
CFWGUM
URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
355 PM CHST THU MAY 7 2026
GUZ001-MPZ001>003-072000-
/O.EXT.PGUM.SU.Y.0040.000000T0000Z-260508T0600Z/
/O.CON.PGUM.RP.S.0013.000000T0000Z-260510T0600Z/
GUAM-ROTA-TINIAN-SAIPAN-
355 PM CHST THU MAY 7 2026
..HIGH SURF ADVISORY NOW IN EFFECT UNTIL 4 PM CHST FRIDAY
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY
AFTERNOON...
* WHAT...LARGE BREAKING WAVES OF 8 TO 10 FEET IN THE SURF ZONE
AND DANGEROUS RIP CURRENTS.
* WHERE...FOR THE HIGH SURF ADVISORY, NORTH FACING REEFS OF THE
MARIANAS. FOR THE HIGH RIP CURRENT RISK, NORTH AND EAST FACING
REEFS.
* WHEN...FOR THE HIGH SURF ADVISORY, UNTIL 4 PM CHST FRIDAY. FOR
THE HIGH RIP CURRENT RISK, THROUGH SUNDAY AFTERNOON.
* 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...ELEVATED TRADE SWELL, REINFORCED BY A
TRADE-WIND SURGE CAUSED BY THE PRESSURE GRADIENT BETWEEN
TROPICAL STORM HAGUPIT (05W) TO THE SOUTH-SOUTHWEST AND THE
SUBTROPICAL RIDGE TO THE NORTH, IS PRODUCING A HIGH RISK OF RIP
CURRENTS ALONG NORTH AND EAST FACING REEFS, AND HAZARDOUS SURF
ALONG NORTH FACING REEFS. ALTHOUGH THE PRIMARY SWELL COMPONENT
IS EASTERLY, THE SMALL NORTHERLY SWELL ENERGY, IN ADDITION TO
SWELL WRAP-AROUND EFFECTS, IS SUFFICIENT TO MAINTAIN HAZARDOUS
SURF OF 9 FEET ALONG NORTH FACING REEFS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
RIP CURRENTS WILL BE LIFE THREATENING. INEXPERIENCED SWIMMERS
SHOULD REMAIN OUT OF THE WATER DUE TO DANGEROUS SURF CONDITIONS.
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.
DECOU
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