384
WHMY40 PGUM 171803
CFWGUM

URGENT - IMMEDIATE BROADCAST REQUESTED
Coastal Hazard Message
National Weather Service Tiyan GU
403 AM ChST Sat Apr 18 2026

MPZ002-003-180815-
/O.CAN.PGUM.CF.W.0001.000000T0000Z-260417T1900Z/
/O.CON.PGUM.SU.W.0005.000000T0000Z-260418T0000Z/
/O.CON.PGUM.CF.Y.0002.260417T1900Z-260419T0100Z/
/O.CON.PGUM.SU.Y.0038.260418T0000Z-260419T0700Z/
/O.CON.PGUM.RP.S.0011.000000T0000Z-260419T0700Z/
Tinian-Saipan-
403 AM ChST Sat Apr 18 2026

...COASTAL FLOOD WARNING IS CANCELLED...
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST THIS
MORNING...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY
AFTERNOON...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 11 AM CHST
SUNDAY...
...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 5 PM CHST SUNDAY...

* WHAT...For the High Surf Warning, dangerously
  large breaking waves of 12 to 17 feet. For the Coastal Flood
  Advisory, minor coastal flooding of 1 to 2 feet expected. For the
  High Surf Advisory, large breaking waves of 10 to 14 feet
  expected. For the High Rip Current Risk, dangerous rip currents.

* WHERE...South, west, and north facing reefs of Tinian and Saipan.

* WHEN...For the High Surf Warning, until 10 AM ChST this
  morning. For the Coastal Flood Advisory, until 11 AM ChST Sunday.
  For the High Surf Advisory, from 10 AM this morning to 5 PM ChST
  Sunday. For the High Rip Current Risk, through Sunday afternoon.

* IMPACTS...Flooding of lots, parks, and roads with only isolated
  road closures expected. 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...As Typhoon Sinlaku continues to move away,
  the primary swell and highest surf will be northwest. Seas will
  be slow to subside over the next couple of days.

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.

&&

$$

GUZ001-MPZ001-180815-
/O.CON.PGUM.SU.W.0005.000000T0000Z-260418T0000Z/
/O.CON.PGUM.CF.Y.0002.000000T0000Z-260418T0700Z/
/O.CON.PGUM.SU.Y.0038.260418T0000Z-260419T0700Z/
/O.CON.PGUM.RP.S.0011.000000T0000Z-260419T0700Z/
Guam-Rota-
403 AM ChST Sat Apr 18 2026

...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST THIS
MORNING...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST THIS
AFTERNOON...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY
AFTERNOON...
...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 5 PM CHST SUNDAY...

* WHAT...For the High Surf Warning, dangerously large breaking
  waves of 11 to 15 feet. For the Coastal Flood Advisory, minor
  coastal flooding of 1 to 2 feet. For the High Surf Advisory,
  large breaking waves of 10 to 14 feet expected. For the High Rip
  Current Risk, dangerous rip currents.

* WHERE...South, west and north facing reefs and shorelines of
  Guam and Rota.

* WHEN...For the High Surf Warning, until 10 AM ChST this morning.
  For the Coastal Flood Advisory, until 5 PM ChST today. For the
  High Surf Advisory, from 10 AM this morning to 5 PM ChST Sunday.
  For the High Rip Current Risk, through Sunday afternoon.

* IMPACTS...Flooding of lots, parks, and roads with only isolated
  road closures expected. 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...As TY Sinlaku continues to move away, the
  primary swell and highest surf will be northwest. Seas will be
  slow to subside over the next couple of days. Surf heights of
  12 to 16 feet are expected for Guam and Rota.

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.

&&

$$

Williams