WTPQ81 PGUM 152259 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Typhoon Sinlaku (04W) Local Statement National Weather Service Tiyan GU 859 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 CNMI. .WATCHES/WARNINGS... A Typhoon Warning continues for Rota, Tinian, Saipan, Alamagan, Pagan, and Agrihan. A Tropical Storm Warning and a Typhoon Watch continues for Guam. A Flood Watch is in effect for portions of Guam and the Northern Marianas. Please listen closely for any Flood 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 7 AM ChST...the center of Typhoon Sinlaku (04W) was located near latitude 17.0N, longitude 144.5E. This was about 155 miles north-northwest of Saipan. Storm motion was north, 350 degrees, at 6 mph. Storm intensity was 130 mph. .SITUATION OVERVIEW... The eye of Typhoon Sinlaku (04W) is moving slowly north and the the eye is well north-northwest of Tinian and Saipan. Typhoon Sinlaku has been slow to move out. and has simultaneously expanded the TS wind field. This has kept Guam just within the tropical storm force winds and Saipan and Tinian are now on the outer edge of the destructive tropical storm winds. Typhoon Sinlaku is now moving through the northern CNMI just west of Alamagan, Pagan, and Agrihan As Sinlaku moves through the northern CNMI today and tonight, it is forecast 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 Mariana 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 hardened shelter. Remain in shelter until the all clear is given. Closely monitor NOAA weather radio or other local news outlets for official storm information. Listen for possible changes to the forecast. && .NEXT UPDATE... The next local statement will be issued by the National Weather Service in Tiyan around 3 PM, or sooner if conditions warrant. GUZ001-160700- /O.CON.PGUM.TR.W.4004.000000T0000Z-000000T0000Z/ /O.CON.PGUM.TY.A.4004.000000T0000Z-000000T0000Z/ Guam- 859 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". TS force gusts remain possible with any passing shower. && ...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 until late morning. Winds could fall below tropical storm force as early as 11 AM. However, tropical storm force gusts remain a possibility through today, especially with any passing shower. ...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. Surf will be slow to decrease over the next few days as swell from Sinlaku continues to pummel northern and western Marianas shores. Guam could also see inundation of up to 1 foot into the weekend. ...OTHER STORM EFFECTS... Heavy rainfall is no longer a threat. $$ MPZ001>003-160700- /O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/ Rota-Tinian-Saipan- 859 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. Strong to tropical storm force gusts remain a possibility for the next day or two, especially with any passing shower. Destruction of remaining metal roof homes is possible today. 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. && ...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 of 39 mph around mid- to late-afternoon today. 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 north-northwest, away from the islands. Destructive winds will be expected through this morning. Winds will continue to decrease today as Sinlaku moves farther away, with 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 this evening, possibly after midnight. ...COASTAL INUNDATION AND SURF INFORMATION... Dangerous surf at Rota is expected to be around 13 to 18 feet, especially along south and 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. Sinlaku is producing a fully developed northwest to north swell as well. 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 is still possible through this afternoon for Tinian and Saipan. As such, a Flood Watch remains in effect for Tinian and Saipan. See latest forecast for information. Listen for possible flash flood warnings for your location, and be ready to act if flash flooding develops. Heavy rainfall is no longer a threat for Rota. && ...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 later 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 today and Friday, bringing additional rainfall amounts of 5 to 10 inches by the weekend, with rainfall amounts upwards of 10 to 20 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 later 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 evening 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 today and Friday, bringing additional rainfall amounts of 5 to 10 inches by the weekend, with rainfall amounts upwards of 10 to 20 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 later this morning with typhoon winds around 75 mph possibly reaching the island late this evening 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 night 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 today and tomorrow, bringing rainfall amounts of 6 to 12 inches by the weekend, with rainfall amounts upwards of 10 to 20 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. $$