WTPQ81 PGUM 151703 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Typhoon Sinlaku (04W) Local Statement National Weather Service Tiyan GU 303 AM ChST Thu Apr 16 2026 ...TYPHOON SINLAKU CONTINUES TO SLOWLY MOVE NORTHWEST AWAY FROM TINIAN AND SAIPAN... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides important information and recommended actions for people in Guam and the Northern Marianas. .WATCHES/WARNINGS... A Typhoon Warning continues for Rota, Tinian, Saipan, Alamagan, Pagan, and Agrihan. A Tropical Storm Warning and a Typhoon Watch continue for Guam. A Flood Watch is in effect for Tinian and Saipan. Please monitor forecasts for any Flood Advisories or Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 2 AM ChST...the center of Typhoon Sinlaku (04W) was located near latitude 16.5N...longitude 144.5E. This was about 210 miles north of Guam. Storm motion was northwest, 305 degrees, at 5 mph. Storm intensity was 125 mph. .SITUATION OVERVIEW... The eye of Typhoon Sinlaku (04W) is moving slowly northwest and the outer edge of the eye is well northwest of Tinian and Saipan. Typhoon Sinlaku has been slow to move tonight and has simultaneously expanded the wind field. This has kept Guam within the tropical storm force winds and Saipan and Tinian in the destructive tropical storm force winds through the night. Typhoon Sinlaku will begin to pass through the northern CNMI just west of Alamagan, Pagan, and Agrihan today and tonight, forecasted to curve northeastward, passing north of Agrihan Friday. .PRECAUTIONARY/PREPAREDNESS ACTIONS... For those under a warning in Guam, Rota, Tinian, and Saipan, remain in a designated shelter or in a sturdy, fully reinforced concrete building to ride out the storm until winds have subsided and the "all clear" is given. Stay inside and away from windows. Do not venture outside when high winds are occurring as flying debris can easily cause serious injury. For those under a warning in the far northern Marianas Islands of Alamagan, Pagan, and Agrihan, preparations for the protection of life and property should have already been completed. People should be in a designated shelter. Closely monitor NOAA weather radio or other local news outlets for official storm information. Listen for possible changes to the forecast. For additional precautionary and preparedness information, please refer to the detailed recommendations relative to your location as further described by your local National Weather Service office and local emergency management. && .NEXT UPDATE... The next local statement will be issued by the National Weather Service in Tiyan around 9 AM today or sooner if conditions warrant. GUZ001-160115- /O.CON.PGUM.TR.W.4004.000000T0000Z-000000T0000Z/ /O.CON.PGUM.TY.A.4004.000000T0000Z-000000T0000Z/ Guam- 303 AM ChST Thu Apr 16 2026 ...Tropical Storm Warning remains in effect... ...Typhoon Watch remains in effect... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... People should remain in a designated shelter or in a sturdy and reinforced concrete building. Due to the size and slow movement of the storm, tropical storm force winds will be slow to subside, potentially beginning to fall below damaging levels this morning. according to the latest forecast from the Joint Typhoon Warning Center. Even when winds start to decrease, remain indoors until the government of Guam gives the "all clear". && ...WIND INFORMATION... As Typhoon Sinlaku (04W) continues to move northwest and away from Guam, southwest tropical storm force winds around 35 to 40 mph and gusts up 55 mph will continue through this morning. Then, winds are forecasted to slowly subside below 39 mph this afternoon. ...COASTAL INUNDATION AND SURF INFORMATION... Dangerous surf of 12 to 16 feet are occurring across south, west, and north facing reefs of Guam, driven by the southwesterly winds. While surf is expected to slowly subside along east facing reefs, surf is likely still hazardous at around 10 to 12 feet. Greatest coastal flooding will likely be along west facing shores and beaches due to the wind driven waves, with 1 to 3 ft still expected, so the Coastal Flood Warning remains in effect. Heavy rainbands have moved off of Guam, which should help limit the potential of inland flooding from inundation. Surf will be slow to decrease in the second half of the week after Sinlaku's exit to the northwest, and swell from Sinlaku continues to pummel northern and western Marianas shores. ...OTHER STORM EFFECTS... The risk for heavy rainfall has decreased for Guam and the Flash Flood Watch was canceled. $$ MPZ001>003-160115- /O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/ Rota-Tinian-Saipan- 303 AM ChST Thu Apr 16 2026 ...Typhoon Warning remains in effect... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... People should remain in a designated shelter or in a sturdy and reinforced concrete building to ride out the storm as tropical storm force winds are occurring at Rota, and strong tropical storm force winds are occurring at Tinian and Saipan. Due to the size of the storm, the latest forecast has tropical storm force winds continuing at Rota through this afternoon, and tonight for Tinian and Saipan. Even when winds start to decrease, remain indoors until the "all clear" is given. && ...WIND INFORMATION... For Rota, southwesterly tropical storm winds around 35 to 45 mph with gusts to 60 mph are still expected, especially during periods of showers, The risk for typhoon force winds of 75 mph at Rota are remote. Winds are then expected to drop below tropical storm force winds of 39 mph around late this afternoon. For Tinian and Saipan, south to southwest winds of around 60 to 70 mph with gusts to 90 mph are possible as the eye continues to move slowly northwest and away from the islands. Destructive winds will be expected through this morning. Destruction of remaining metal roof homes is expected. Electricity and water will remain unavailable for days and perhaps weeks after the storm passes. Most trees will be snapped or uprooted. Fallen trees may cut off residential areas for days to weeks. Winds will continue to decrease today as Sinlaku continues to move away, with strong tropical force winds continuing through late tonight, before decreasing to tropical storm force winds Thursday morning. Due to the size of the storm, tropical storm force winds will continue through Thursday evening. ...COASTAL INUNDATION AND SURF INFORMATION... Dangerous surf at Rota is expected to be around 13 to 18 feet, especially along west facing reefs due to westerly wind-driven waves, also wrapping around to north and south facing reefs. For Tinian and Saipan, 20 to 25 feet is possible along north, south and west facing reefs as winds have shifted south to southwest, starting to limit surf along east facing reefs at this time. Inundation of 2-4 feet for Rota is possible along south, west, and north facing reefs due to westerly wind-driven surf. For Tinian and Saipan, inundation of 4 to 6 feet is expected. A Coastal Flood Warning remains in effect. Inland flooding made worse by rainbands will significantly increase coastal inundation as rain run-off and storm surge interact. Surf will be slow to decrease after Sinlaku's exit to the northwest for the remainder of the week, as swells will continue to pummel western Marianas shores. ...OTHER STORM EFFECTS... Heavy rainfall is still possible as quick-moving rainbands rotate across Tinian and Saipan south of the center of Sinlaku. Additional rainfall of 2 to 6 inches of rainfall are still possible for Tinian and Saipan through this afternoon. As such, a Flood Watch remains in effect for Tinian and Saipan but was cancelled for Rota. See latest forecast for latest information. Listen for possible flash flood warnings for your location, and be ready to act if flash flooding develops. && ...ALAMAGAN... ...A TYPHOON WARNING NOW IN EFFECT FOR ALAMAGAN... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Typhoon Sinlaku (04W). The window of time to complete preparations for the protection of life and property has closed. Find shelter to ride out the storm. Remain in a sturdy shelter until the "all clear" is given. Heed the advice of your local emergency managers and officials, and continue to monitor forecasts by your local National Weather Service office in Tiyan, Guam. .WIND INFORMATION... Northeasterly tropical storm force winds around 65 mph are expected to increase with typhoon winds around 75 mph this morning as Sinlaku passes to the west, and winds shift towards the southeast. The size of the storm and overall storm motion will maintain southeast tropical storm winds through Friday afternoon as Sinlaku continues on its accelerated northward trek after exiting the Marianas later in the week. .COASTAL INUNDATION AND SURF INFORMATION... Seas of 20 to 30 feet remain possible, with dangerous surf and significant coastal inundation and beach erosion possible. .OTHER STORM EFFECTS... Heavy, intense rainfall with TY Sinlaku is likely through the latter half of the week, bringing rainfall amounts of 10 to 15 inches by Friday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system moves across the northern CNMI. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. ...PAGAN... ...A TYPHOON WARNING REMAINS IN EFFECT FOR PAGAN... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Typhoon Sinlaku (04W). The window of time to complete preparations for the protection of life and property has closed. Find shelter to ride out the storm. Remain in a sturdy shelter until the "all clear" is given. Heed the advice of your local emergency managers and officials, and continue to monitor forecasts by your local National Weather Service office in Tiyan, Guam. .WIND INFORMATION... Northeasterly tropical storm force winds around 60 mph are expected to increase this morning with typhoon winds around 75 mph as Sinlaku passes to the west, and winds shift toward the west. The size of the storm and overall storm motion will maintain southeast tropical storm winds through Friday afternoon as Sinlaku continues on its accelerated northward trek after exiting the Marianas later in the week. .COASTAL INUNDATION AND SURF INFORMATION... Seas of 20 to 30 feet remain possible, with dangerous surf and significant coastal inundation and beach erosion possible. .OTHER STORM EFFECTS... Heavy, intense rainfall with TY Sinlaku is likely through the latter half of the week, bringing rainfall amounts of 10 to 15 inches by Friday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system moves across the northern CNMI. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. && ...AGRIHAN... ...A TYPHOON WARNING REMAINS IN EFFECT FOR AGRIHAN... ..PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Typhoon Sinlaku (04W). The window of time to complete preparations for the protection of life and property has closed. Find shelter to ride out the storm. Remain in a sturdy shelter until the "all clear" is given. Heed the advice of your local emergency managers and officials, and continue to monitor forecasts by your local National Weather Service office in Tiyan, Guam. .WIND INFORMATION... Northeasterly tropical storm force winds around 50 mph will be increasing this morning with typhoon winds around 75 mph possibly reaching the island this afternoon as Sinlaku passes nearby to the west, and winds shift toward the southeast. The size of the storm and overall storm motion will maintain southeast tropical storm winds into Friday evening as Sinlaku continues on its accelerated northward trek after exiting the Marianas. .COASTAL INUNDATION AND SURF INFORMATION... Seas of 20 to 30 feet will be possible, with dangerous surf and significant coastal inundation and beach erosion possible. .OTHER STORM EFFECTS... Heavy, intense rainfall with TY Sinlaku is likely through the latter half of the week, bringing rainfall amounts of 10 to 15 inches by Friday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system moves across the northern CNMI. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. $$