052
WHMY40 PGUM 180728 AAA
CFWGUM

URGENT - IMMEDIATE BROADCAST REQUESTED
Coastal Hazard Message...UPDATED
National Weather Service Tiyan GU
528 PM ChST Sat Apr 18 2026

MPZ002-003-182100-
/O.EXT.PGUM.SU.Y.0038.000000T0000Z-260419T1900Z/
/O.EXT.PGUM.RP.S.0011.000000T0000Z-260419T1900Z/
/O.CON.PGUM.CF.Y.0002.000000T0000Z-260419T0100Z/
Tinian-Saipan-
528 PM ChST Sat Apr 18 2026

Updated expiration times.

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 5 AM CHST MONDAY...
...HIGH RIP CURRENT RISK NOW IN EFFECT THROUGH LATE SUNDAY
NIGHT...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 11 AM CHST
SUNDAY...

* WHAT...Large breaking waves of 10 to 14 feet and dangerous rip
  currents. Minor coastal flooding of 1 to 2 feet expected.

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

* WHEN...For the Coastal Flood Advisory, until 11 AM ChST Sunday.
  For the High Surf Advisory and High Rip Current Risk, until 5 AM
  ChST Monday.

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

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.

&&

$$

GUZ001-MPZ001-182100-
/O.EXT.PGUM.SU.Y.0038.000000T0000Z-260419T1900Z/
/O.EXT.PGUM.RP.S.0011.000000T0000Z-260419T1900Z/
Guam-Rota-
528 PM ChST Sat Apr 18 2026

Updated expiration times.

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 5 AM CHST MONDAY...
...HIGH RIP CURRENT RISK NOW IN EFFECT THROUGH LATE SUNDAY
NIGHT...

* WHAT...Large breaking waves of 9 to 14 feet and dangerous rip
  currents.

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

* WHEN...Until 5 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 Typhoon Sinlaku continues to move away,
  the primary swell and highest surf will be northwest. Seas and
  surf will be slow to subside over the next couple of days.

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.

&&

$$

IC