720 WHMY40 PGUM 170600 CFWGUM URGENT - IMMEDIATE BROADCAST REQUESTED Coastal Hazard Message National Weather Service Tiyan GU 400 PM ChST Fri Apr 17 2026 MPZ002-003-172000- /O.CON.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- 400 PM ChST Fri Apr 17 2026 ...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CHST SATURDAY... ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST SATURDAY... ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 5 AM SATURDAY TO 11 AM CHST SUNDAY... ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 5 PM CHST SUNDAY... * WHAT...For the Coastal Flood Warning, significant coastal flooding of 3 to 5 feet. For the High Surf Warning, dangerously large breaking waves of 17 to 23 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 and shorelines of Tinian and Saipan. * WHEN...For the Coastal Flood Warning, until 5 AM ChST Saturday. For the High Surf Warning, until 10 AM ChST Saturday. For the Coastal Flood Advisory, from 5 AM Saturday to 11 AM ChST Sunday. For the High Surf Advisory, from 10 AM Saturday to 5 PM ChST Sunday. For the High Rip Current Risk, through Sunday afternoon. * 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. 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-MPZ001-172000- /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- 400 PM ChST Fri Apr 17 2026 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST SATURDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST SATURDAY... ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON... ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 5 PM CHST SUNDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 16 to 20 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 Saturday. For the Coastal Flood Advisory, until 5 PM ChST Saturday. For the High Surf Advisory, from 10 AM Saturday 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 18 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. && $$ Kleeschulte  183 WHPQ42 PGUM 170640 CFWPQ2 URGENT - IMMEDIATE BROADCAST REQUESTED Coastal Hazard Message National Weather Service Tiyan GU 440 PM ChST Fri Apr 17 2026 PWZ002>006-170745- /O.EXP.PGUM.SU.Y.0036.000000T0000Z-260417T0700Z/ Melekeok-Airai-Koror-Peleliu-Angaur- 440 PM ChST Fri Apr 17 2026 ...HIGH SURF ADVISORY WILL EXPIRE AT 5 PM CHST THIS AFTERNOON... Surf along north facing reefs have fallen below the 9 foot threshold for a High Surf Advisory. Surf is expected to continue to gradually drop over the next several days. $$ FMZ037-172200- /O.EXT.PGUM.SU.Y.0036.000000T0000Z-260418T0700Z/ /O.EXT.PGUM.CF.S.0004.000000T0000Z-260418T0700Z/ Yap- 440 PM ChST Fri Apr 17 2026 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 5 PM CHST SATURDAY... ...COASTAL FLOOD STATEMENT NOW IN EFFECT THROUGH SATURDAY AFTERNOON... * WHAT...Large breaking waves of 9 to 11 feet. Minor coastal flooding possible. * WHERE...North and east facing reefs of Yap. * WHEN...Until 5 PM ChST Saturday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...Large northeast swell from Typhoon Sinlaku will bring hazardous surf along north and east facing reefs through at least Saturday afternoon. Hazardous surf, combined with the higher high tides with the new moon cycle, may produce minor coastal inundation along northern and eastern shorelines at times of high tide. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$ Bowsher