WHMY40 PGUM 162126
CFWGUM

URGENT - IMMEDIATE BROADCAST REQUESTED
Coastal Hazard Message
National Weather Service Tiyan GU
726 AM ChST Sat Oct 17 2026

GUZ001-MPZ001>003-171300-
/O.UPG.PGUM.CF.A.0006.261017T0700Z-261018T1800Z/
/O.NEW.PGUM.CF.W.0003.261017T0700Z-261018T1800Z/
/O.CON.PGUM.SU.W.0009.261017T0700Z-261018T1800Z/
Guam-Rota-Tinian-Saipan-
726 AM ChST Sat Oct 17 2026

...COASTAL FLOOD WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO
4 AM CHST MONDAY...
...HIGH SURF WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON
TO 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 coast 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.

&&

$$