Coastal Flood Warning issued April 14 at 4:10AM ChST until April 16 at 5:00AM ChST by NWS Tiyan GU

Details

* WHAT...For the High Surf Warning, dangerously large breaking
waves of 13 to 18 feet for Guam and 15 to 20 ft for Rota and
20 to 30 ft at Tinian and Saipan. For the Coastal Flood Warning,
significant coastal flooding 1 to 3 ft for Guam, and 3 to 5 ft
for Rota and 5 to 8 feet, potentially reaching up to 10 to
15 feet, for Tinian and Saipan.

* WHERE...North, east and south facing reefs of the Marianas. For
the Coastal Flood Watch, north, east, and south facing
shorelines.

* WHEN...For the Coastal Flood Warning, until 5 AM ChST Thursday.
For the High Surf Warning, until 6 PM ChST Thursday.

* 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 STY Sinlaku moves towards the Marianas
swell and surf will continue to build. This will maintain
dangerous surf and coastal inundation, especially as STY Sinlaku
begins to move through the Marianas on Tuesday. Inundation has
already been reported at Inarajan Pools. Tinian and Saipan could
see wave and wind driven surf push water on to land up to 10 to
15 feet higher than the water-level, especially along windward
facing beaches and shores.