WHMY40 PGUM 150557
CFWGUM

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

GUZ001-151300-
/O.EXT.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
/O.CON.PGUM.CF.W.0001.000000T0000Z-260415T1900Z/
Guam-
357 PM ChST Wed Apr 15 2026

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

* 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 through Friday night.

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.

&&

$$

MPZ001-151300-
/O.EXT.PGUM.CF.W.0001.000000T0000Z-260416T0700Z/
/O.EXT.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
Rota-
357 PM ChST Wed Apr 15 2026

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

&&

$$

MPZ002-003-151300-
/O.EXT.PGUM.CF.W.0001.000000T0000Z-260417T0200Z/
/O.EXT.PGUM.SU.W.0005.000000T0000Z-260417T0700Z/
Tinian-Saipan-
357 PM ChST Wed Apr 15 2026

...COASTAL FLOOD WARNING NOW IN EFFECT UNTIL NOON CHST FRIDAY...
...HIGH SURF WARNING NOW 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.

&&

$$

Kleeschulte