630
WHMY40 PGUM 170631
CFWGUM
URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE TIYAN GU
431 PM CHST SAT OCT 17 2026
GUZ001-MPZ001>003-172045-
/O.CON.PGUM.CF.W.0003.261017T0700Z-261018T1800Z/
/O.CON.PGUM.SU.W.0009.261017T0700Z-261018T1800Z/
GUAM-ROTA-TINIAN-SAIPAN-
431 PM CHST SAT OCT 17 2026
...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 4 AM CHST MONDAY...
..HIGH SURF WARNING REMAINS IN EFFECT UNTIL 4 AM CHST MONDAY
* WHAT...FOR THE COASTAL FLOOD WARNING, SIGNIFICANT COASTAL FLOODING
EXPECTED. FOR THE HIGH SURF WARNING, DANGEROUSLY LARGE BREAKING
WAVES UP TO 35 FEET FOR GUAM, 20 TO 25 FEET FOR ROTA, AND 15 TO 20
FEET FOR TINIAN AND SAIPAN.
* WHERE...GUAM, ROTA, TINIAN AND SAIPAN.
* WHEN...FROM 5 PM THIS AFTERNOON TO 4 AM CHST MONDAY.
* IMPACTS...NUMEROUS ROADS MAY BE CLOSED. LOW-LYING PROPERTY
INCLUDING HOMES, BUSINESSES, AND SOME CRITICAL INFRASTRUCTURE WILL
BE INUNDATED. SHORELINE EROSION WILL OCCUR. BREAKING WAVES CAN
SWEEP PEOPLE OFF THEIR FEET, AND INTO DANGEROUS SEAS. LIFE-
THREATENING SWIMMING CONDITIONS AND SIGNIFICANT BEACH EROSION CAN
BE EXPECTED. COASTAL INUNDATION OF 5 TO 7 FEET FOR GUAM, 2 TO 4
FEET FOR ROTA AND 1 TO 3 FEET FOR TINIAN AND SAIPAN IS POSSIBLE
ALONG WITH COASTAL FLOODING AND BEACH EROSION.
* ADDITIONAL DETAILS...SURF IS EXPECTED TO RISE RAPIDLY TO DANGEROUS
LEVELS TONIGHT. COASTAL IMPACTS TO THE WESTERN COASTS OF GUAM AND
ROTA ARE HIGHLY DEPENDENT ON THE FINAL TRACK OF CHAMPI; PASSAGE
SOUTH OF GUAM WOULD BE REDUCED IMPACTS WHEREAS PASSAGE OVER GUAM
WOULD RESULT IN LARGER COASTAL INUNDATION.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EVERYONE SHOULD REMAIN OUT OF THE WATER DUE TO LIFE-THREATENING
SURF CONDITIONS. STAY WELL AWAY FROM THE COAST.
KLEESCHULTE
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