WTPQ81 PGUM 131129 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Super Typhoon Sinlaku (04W) Local Statement National Weather Service Tiyan GU 929 PM ChST Mon Apr 13 2026 ...SUPER TYPHOON SINLAKU MOVING WEST-NORTHWEST TOWARD THE MARIANAS... .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 remains in effect for Rota, Tinian, and Saipan. A Tropical Storm Warning and Typhoon Watch remain in effect for Guam. A Tropical Storm Warning remains in effect for Pagan and Alamagan. A Tropical Storm Watch remains in effect for Agrihan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flash 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 9 PM ChST...the center of Super Typhoon Sinlaku (04W) was located near latitude 13.0N...longitude 147.6E. This was about 190 miles east of Guam. Storm motion was west-northwest, 300 degrees, at 8 mph. Storm intensity was 175 mph. .SITUATION OVERVIEW... Super Typhoon Sinlaku (04W) continues to move west-northwest toward the Marianas with a slight northwest turn expected. The outer rain bands of Sinlaku are rotating in over the islands, and continue to bring periods of heavy showers, thunderstorms, and strong winds. The most recent storm track produced by the Joint Typhoon Warning Center (JTWC) is still maintaining a track north of Rota and near or over Tinian and Saipan. Sinlaku is expected to gradually weaken the next few days, but still expected to cross the Marianas as a Category 4 or 5 typhoon. .PRECAUTIONARY/PREPAREDNESS ACTIONS... For those under a warning in Guam, Rota, Tinian, and Saipan, preparations for the protection of life and property has closed. People should be in a designated shelter or in a sturdy, fully reinforced concrete building to ride out the storm as tropical storm force winds are occurring or will occur shortly. For interests at ports, docks, and marinas, prescribed preparations according to your emergency operations plan for tropical cyclones should now be complete. If you live on a boat, final preparations for securing your craft should be completed and then leaving it for shelter. Small craft should remain in port and well secured. For those under a Warning in the far northern Marianas Islands, rush to complete preparations for the protection of life and property and to seek shelter. For those under a Watch in the far northern Mariana Islands, continue with your preparations and listen for possible warnings. Closely monitor NOAA weather radio or other local news outlets for official storm information. Listen for possible changes to the forecast. Stay indoors during heavy rain and windy conditions associated with Super Typhoon Sinlaku (04W). The onset of damaging, and potentially destructive winds, will pose a deadly threat to those venturing outside. 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 3 AM ChST...or sooner if conditions warrant. GUZ001-131930- /O.CON.PGUM.TR.W.4004.000000T0000Z-000000T0000Z/ /O.CON.PGUM.TY.A.4004.000000T0000Z-000000T0000Z/ Guam- 929 PM ChST Mon Apr 13 2026 ...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Preparations for the protection of life and property has closed. People should be in a designated shelter or in a sturdy and reinforced concrete building to ride out the storm as tropical storm force winds are occurring or will occur shortly. Remain indoors until the government of Guam gives the "all clear". Due to the size of the storm tropical storm force winds will likely continue into Wednesday evening. && ...WIND INFORMATION... As Super Typhoon Sinlaku (04W) continues to move closer, north to northeast tropical storm force winds of 40 to 50 mph are or will shortly start to affect Guam tonight. The latest forecast has expanded the wind field so strong tropical storm winds around 60 mph are possible for Guam. Tropical storm force winds around 50 to 60 mph and gusts to 70 mph are possible into early Tuesday night as winds shift towards the northwest and then west. Tropical storm force winds are currently forecast to continue into Wednesday evening. ...COASTAL INUNDATION AND SURF INFORMATION... Due to higher astronomical tides this week and pre-existing elevated seas, dangerous surf is expected or already occurring across north, east and south reefs in the Marianas as surf heights build to around 12 to 16 feet, and potentially spreading to west facing reefs once STY Sinlaku moves west of the islands in the next few days. The more northern trek of Sinlaku could help to limit the peak of coastal inundation but inundation of 1 to 3 ft is still expected as surf and wind driven waves increase as tropical storm force winds affect Guam; as such, a Coastal Flood Waring is 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 north-northwest in the second half of the week, as swells will continue to pummel western Marianas shores. ...OTHER STORM EFFECTS... Heavy, intense rainfall with STY Sinlaku is likely, as quick- moving north-northeasterly showers are making their way across the area and will continue to do so through at least Wednesday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system crosses the Marianas. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. The more northern track currently forecast will likely shift this heavier rainfall north of Guam, but 6 to 12 inches of rainfall are still possible. 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>003-131930- /O.CON.PGUM.TY.W.4004.000000T0000Z-000000T0000Z/ Rota-Tinian-Saipan- 929 PM ChST Mon Apr 13 2026 ...TYPHOON WARNING REMAINS IN EFFECT... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Preparations for the protection of life and property has closed. People should be in a designated shelter or in a sturdy and reinforced concrete building to ride out the storm as tropical storm force winds are occurring or will occur shortly. Remain indoors until "all clear" is given by local officials. Due to the size of the storm tropical storm force winds will likely continue into Wednesday night for Rota and into Thursday morning for Tinian and Saipan. If staying in a home, turn the refrigerator to maximum cold and keep it closed. Turn off propane tanks and unplug small appliances. Fill the bathtub with water in case the tap water becomes unavailable after the storm. This is for cleaning and flushing purposes. Do not drink it. && ...WIND INFORMATION... As Super Typhoon Sinlaku (04W) moves closer, northerly tropical storm force winds are occurring or still start to occur shortly across Rota, Tinian and Saipan tonight, with Typhoon force winds developing Tuesday. The recent storm tracks have maintained a northward passage of STY Sinlaku as it moves into the Marianas as a Category 4 or 5 Typhoon, passing near or across Tinian and Saipan. For Rota, if this track holds, the risk for Typhoon force winds of 75 mph or greater has diminish but are still possible. For now the forecast has northerly tropical storm winds around 40 mph and gusts to 50mph, increasing to 45 to 65 mph with gusts to 80 after midnight. winds are then expected to become northwest to west and increasing to 50 to 70 mph with gusts to 85 mph Tuesday with typhoon force winds of around 75 mph possible. Tropical storm winds are expected to continue into Wednesday night as winds shift to the southwest. For Tinian and Saipan, the current track has Sinlaku passing near or directly overhead Tuesday through Tuesday night. This is forecasted to bring winds around 125 to 145 mph with gusts to 160 mph possible. Devastating damage is possible if this forecast track and wind speed holds. Airborne debris will cause extensive damage. Persons, pets, and livestock struck by the wind blown debris will be injured or killed. Nearly all metal roof homes will be destroyed. 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. ...COASTAL INUNDATION AND SURF INFORMATION... Due to higher astronomical tides this week and pre-existing elevated seas, dangerous surf is expected or already occurring across north, east and south reefs in the Marianas and potentially spreading to west facing reefs once STY Sinlaku moves west of the Islands. Surf at Rota is expected to build to around 15 to 20 feet, and 20 to 30 ft at Tinian and Saipan. A more northern track of Sinlaku could help to limit the peak of coastal inundation at Rota, but inundation of at least 3-5 feet is expected as surf and wind driven waves increase as strong tropical storm force winds arrive. For Tinian and Saipan inundation of of at least 5-8 feet is expected but wind and wave driven surf could push water 10-15 ft higher than the water-level, especially along windward facing beaches and reefs. A Coastal Flood Warning is 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 in the second half of the week, as swells will continue to pummel western Marianas shores. ...OTHER STORM EFFECTS... Heavy, intense rainfall with STY Sinlaku is likely, as quick- moving north-northeasterly showers are making their way across the area and will continue to do so through at least Wednesday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system crosses the Marianas. The more northern track currently forecasted will likely shift this heavier rainfall over Tinian and Saipan, but 10 to 20 inches of rainfall are still possible for Rota. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. 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... ...TROPICAL STORM WARNING NOW IN EFFECT FOR ALAMAGAN... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Super Typhoon Sinlaku (04W). 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. Remain in a sturdy shelter until the all clear is given. .WIND INFORMATION... Fresh to strong northeasterlies are expected to begin increasing tonight, with tropical storm force winds expected late morning or early afternoon on Tuesday, maintaining these conditions for several days after if Sinlaku continues on its accelerated northward trek after exiting the Marianas in the second half of 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 for much of the week, bringing rainfall amounts of 10 to 13 inches by Friday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system crosses the Marianas. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. && ...PAGAN... ...TROPICAL STORM WARNING NOW IN EFFECT FOR PAGAN... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Super Typhoon Sinlaku (04W). 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. Remain in a sturdy shelter until the all clear is given. .WIND INFORMATION... Fresh to strong northeasterlies are expected to begin increasing tonight, with tropical storm force winds expected Tuesday afternoon or evening, maintaining these conditions for several days after if Sinlaku continues on its accelerated northward trek after exiting the Marianas in the second half of 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 for much of the week, bringing rainfall amounts of 10 to 13 inches by Friday, with rainfall amounts upwards of 15 to 25 inches near the center, as the system crosses the Marianas. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. && ...AGRIHAN... ...TROPICAL STORM WATCH NOW IN EFFECT FOR AGRIHAN... ..PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Super Typhoon Sinlaku (04W). 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. Remain in a sturdy shelter until the all clear is given. .WIND INFORMATION... Fresh northeasterlies are expected to begin increasing through Tuesday, with tropical storm force winds possible Wednesday morning, maintaining these conditions for several days after if Sinlaku continues on its accelerated northward trek after exiting the Marianas in the second half of the week. .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 for much of the week, with rainfall amounts upwards of 15 to 25 inches near the center, as the system crosses the Marianas. The exact track of Sinlaku will determine where the heaviest rainfall will set up across the islands. $$ Schank