WHMY40 PGUM 151143
CFWGUM

URGENT - IMMEDIATE BROADCAST REQUESTED
Coastal Hazard Message
National Weather Service Tiyan GU
943 PM ChST Wed Apr 15 2026

GUZ001-160145-
/O.CON.PGUM.CF.W.0001.000000T0000Z-260415T1900Z/
/O.CON.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
Guam-
943 PM ChST Wed Apr 15 2026

...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CHST
THURSDAY...
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 5 PM CHST FRIDAY...

* WHAT...For the Coastal Flood Warning, significant coastal
  flooding up to 4 feet. For the High Surf Warning, dangerously
  large breaking waves of 12 to 16 feet.

* WHERE...South, west and north facing reefs and shorelines.

* WHEN...For the Coastal Flood Warning, until 5 AM ChST Thursday.
  For the High Surf Warning, until 5 PM ChST Friday.

* IMPACTS...Some roads may be closed. Low lying property
  including homes, businesses, and some critical infrastructure
  will be inundated. Some shoreline erosion will occur. Breaking
  waves can sweep people off jetties and docks, and into dangerous
  seas. Life-threatening swimming conditions and significant beach
  erosion can be expected.

* ADDITIONAL DETAILS...As TY Sinlaku continues to move away and
  wind driven waves decrease, the primary swell and highest surf
  will become southwest. Seas will be slow to subside over the next
  couple of days. A High Surf Advisory may continue into the weekend.

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.

&&

$$

MPZ001-160145-
/O.CON.PGUM.CF.W.0001.000000T0000Z-260416T0700Z/
/O.CON.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
Rota-
943 PM ChST Wed Apr 15 2026

...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CHST
THURSDAY...
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 5 PM CHST FRIDAY...

* WHAT...For the Coastal Flood Warning, significant coastal
  flooding up to 6 feet. For the High Surf Warning, dangerously
  large breaking waves of 15 to 20 feet.

* WHERE...South, west and north facing reefs and shorelines.

* WHEN...For the Coastal Flood Warning, until 5 PM ChST Thursday.
  For the High Surf Warning, until 5 PM ChST Friday.

* IMPACTS...Some roads may be closed. Low lying property
  including homes, businesses, and some critical infrastructure
  will be inundated. Some shoreline erosion will occur. Breaking
  waves can sweep people off jetties and docks, and into dangerous
  seas. Life-threatening swimming conditions and significant beach
  erosion can be expected.

* ADDITIONAL DETAILS...As TY Sinlaku continues to move away and
  wind driven waves decrease, the primary swell and highest surf
  will become southwest. Seas will be slow to subside over the next
  couple of days. A High Surf Advisory may continue into the
  weekend.

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.

&&

$$

MPZ002-003-160145-
/O.CON.PGUM.CF.W.0001.000000T0000Z-260417T0200Z/
/O.CON.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
Tinian-Saipan-
943 PM ChST Wed Apr 15 2026

...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL NOON CHST
FRIDAY...
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 5 PM CHST FRIDAY...

* WHAT...For the Coastal Flood Warning, significant coastal
  flooding up to 10 feet. For the High Surf Warning, dangerously
  large breaking waves of 20 to 30 feet.

* WHERE...South, west, and north facing reefs and shorelines.

* WHEN...For the Coastal Flood Warning, until noon ChST Friday.
      For the High Surf Warning, until 5 PM ChST Friday.

* IMPACTS...Numerous roads may be closed. Low lying property
  including homes, businesses, and some critical infrastructure
  will be inundated. Some shoreline erosion will occur. Breaking
  waves can sweep people off jetties and docks, and into dangerous
  seas. Life-threatening swimming conditions and significant beach
  erosion can be expected.

* ADDITIONAL DETAILS...As TY Sinlaku continues to move away and
  wind driven waves decrease, the primary swell and highest surf
  will become southwest. Seas will be slow to subside over the next
  couple of days. A High Surf Advisory may continue into the
  weekend.

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.

&&

$$

Williams