WTPQ81 PGUM 150557 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Typhoon Sinlaku (04W) Local Statement National Weather Service Tiyan GU 357 PM ChST Wed Apr 15 2026 ...TYPHOON SINLAKU MOVING SLOWLY NORTH-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, and Saipan. A Typhoon Warning continues for Alamagan, Pagan, and Agrihan. A Tropical Storm Warning and a Typhoon Watch continue for Guam. A Flood Watch is in effect for all of Guam and the CNMI. 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 PM ChST...the center of Typhoon Sinlaku (04W) was located near latitude 15.8N...longitude 145.0E. This was about 163 miles north of Guam. Storm motion was north-northwest, 350 degrees, at 3 mph. Storm intensity was 125 mph. .SITUATION OVERVIEW... The eye of Typhoon Sinlaku (04W) is moving slowly north-northwest and the outer edge of the eye wall has shifted northwest of Tinian and Saipan. Typhoon force winds are still expected through this afternoon, with strong tropical storm force winds expected tonight. Tropical storm force winds still extend across Rota and Guam, and will be slow to subside across the Marianas due to the size of the storm. Winds look to begin falling below tropical storm force for Guam late tonight, Rota around Thursday morning, and Tinian and Saipan Thursday evening or Thursday night. Typhoon Sinlaku will begin to pass through the northern CNMI just west of Alamagan, Pagan, and Agrihan tonight through Thursday night, 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 be completed and should be seeking shelter to ride out the storm. 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 pm ChST this evening, or sooner if conditions warrant. GUZ001-151400- /O.CON.PGUM.TR.W.4004.000000T0000Z-000000T0000Z/ /O.CON.PGUM.TY.A.4004.000000T0000Z-000000T0000Z/ Guam- 357 PM ChST Wed Apr 15 2026 ...A TROPICAL STORM WARNING REMAINS IN EFFECT... ...A 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 late tonight 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 north-northwest and away from Guam, west-southwest tropical storm force winds around 40 to 50 mph and gusts up 70 mph will continue through this afternoon. Then, winds are forecasted to slowly subside today as winds shift to the southwest, subsiding below 39 mph late tonight or early Thursday morning. ...COASTAL INUNDATION AND SURF INFORMATION... Dangerous surf of 13 to 18 feet are occurring across south, west, and north facing reefs of Guam, driven by the westerly winds. While surf is expected to slowly subside along east facing reefs, surf is likely still hazardous at around 10 to 13 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. Inland flooding made worse by heavier rain bands following storm passage will significantly increase coastal inundation as rain run-off and storm surge interact. Surf will be slow to decrease in the second half of the week after Sinlaku's exit to the north-northwest, and swell from Sinlaku continues to pummel northern and western Marianas shores. ...OTHER STORM EFFECTS... Heavy rainfall is still possible as quick-moving rainbands rotate across Guam, south of Sinlaku. Additional rainfall of 4 to 8 inches of rainfall are still possible through tonight. As such, a Flood Watch remains in effect for Guam. See latest forecast for latest information. Listen for possible flash flood warnings for your location, and be ready to act if flash flooding develops. $$ MPZ001>003-151400- /O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/ Rota-Tinian-Saipan- 357 PM ChST Wed Apr 15 2026 ...TYPHOON WARNING REMAINS IN EFFECT... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... People should be in a designated shelter or in a sturdy and reinforced concrete building to ride out the storm as strong tropical storm force winds are occurring at Rota, south-southwest typhoon force winds remain across Tinian and Saipan and continue to slowly decrease through tonight. Due to the size of the storm, the latest forecast has tropical storm force winds continuing at Rota through Thursday morning, and Thursday evening or Thursday night for Tinian and Saipan. Even when winds start to decrease, remain indoors until the "all clear" is given. && ...WIND INFORMATION... For Rota, strong westerly tropical storm winds around 50 to 60 mph with gusts to 75 mph are still expected, especially as the heavy rain bands move over the island, following the center of Sinlaku. The risk for typhoon force winds of 75 mph at Rota will be decreasing as Sinlaku moves northwest and away from Rota, Tinian, and Saipan. Winds are then expected to decrease to 45 to 55 mph with gusts to 65 mph late afternoon as winds shift southwest and then decrease further to 35 to 45 mph tonight, before dropping to below tropical storm force winds of 39 mph around Thursday morning. For Tinian and Saipan, south to southwest winds of around 90 to 100 mph with gusts to 130 mph are possible as the eye moves slowly north-northwest and away from the islands. Devastating damage is to be expected with the direct passage of Sinlaku. Destruction of all metal roof homes is expected. Electricity and water will be 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 should start to decrease later today as Sinlaku continues to move away, with typhoon force winds continuing through the aftenroon, before decreasing to strong tropical storm force winds later tonight. Due to the size of the storm, tropical storm force winds will continue through Thursday afternoon. ...COASTAL INUNDATION AND SURF INFORMATION... Dangerous surf at Rota is expected to be around 15 to 20 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 30 feet is possible along east, south and west facing reefs as winds have shifted south to southwest, starting to limit surf along north facing reefs at this time. Inundation of 3-5 feet for Rota is possible along south, west, and north facing reefs due to westerly wind-driven surf. For Tinian and Saipan, inundation of at least 5 to 8 feet is expected but wind- and wave- driven surf could push water onto land 10 to 15 ft above mean water- level, especially along windward-facing beaches and reefs. A Coastal Flood Warning remains in effect. Inland flooding made worse by developing rain bands during storm passage 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 Rota, Tinian and Saipan east and south of the center of Sinlaku. Additional rainfall of 5 to 10 inches of rainfall are still possible through tonight for Rota and 10 to 18 inches for Tinian and Saipan due to being closer to the center. As such, a Flood Watch remains in effect for Rota, Tinian and Saipan. 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....Typhoon Warning remains in effect... .WIND INFORMATION... Northeasterly tropical storm force winds around 39 mph are expected to increase with typhoon winds around 75 mph possibly starting late tonight or Thursday 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 39 mph are expected to increase today with typhoon winds around 75 mph possibly starting Thursday morning as Sinlaku passes to the west, and winds shift toward 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. && ...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 39 mph will be increasing today with typhoon winds around 75 mph possibly reaching the island around Thursday 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. $$