WTPQ81 PGUM 110137 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Tropical Storm Sinlaku (04W) Local Statement National Weather Service Tiyan GU 1137 AM ChST Sat Apr 11 2026 ...TROPICAL STORM SINLAKU SLOWLY INTENSIFYING NEAR CHUUK BEFORE HEADING TOWARD THE MARIANAS... .NEW INFORMATION... A Typhoon Watch has now been issued for Guam, Rota, Tinian and Saipan. .AREAS AFFECTED... This local statement provides important information and recommended actions for people in Guam and the Northern Marianas. .WATCHES/WARNINGS... A Typhoon Watch is in effect for Guam, Rota, Tinian, and Saipan. A Typhoon Watch means that Typhoon conditions, including winds of 74 mph or more, are possible within 48 hours. A Flood Watch is in effect for all 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 10 AM ChST...the center of Tropical Storm Sinlaku (04W) was located near latitude 8.5N...longitude 151.5E. This was about 570 miles southeast of Guam. The system has been nearly stationary. It is expected to make a turn toward the north-northwest with an increase in forward speed through Sunday as it treks toward the Marianas. Maximum sustained winds remain at 70 mph. Sinlaku is forecast to intensify through tonight, possibly becoming a typhoon as early as late afternoon today. .SITUATION OVERVIEW... A Typhoon Watch has now been issued. A more detailed statement will follow shortly. .PRECAUTIONARY/PREPAREDNESS ACTIONS... For those under a watch or warning, now is the time to initiate preparations according to your typhoon disaster plan specific to your home or business. For those nearby, review your typhoon disaster plan and become ready to act if a watch or a warning is later issued for your area. It is important to actively listen for forthcoming information from your local National Weather Service office and emergency management agency. && .NEXT UPDATE... The next local statement will be issued by the National Weather Service in Tiyan, Guam shortly. It will provide important details regarding the evolving tropical cyclone threats and their potential impacts upon the area. GUZ001-MPZ001>003-110500- /O.NEW.PGUM.TY.A.4004.260411T0137Z-000000T0000Z/ Guam-Rota-Tinian-Saipan- 1137 AM ChST Sat Apr 11 2026 ...TYPHOON WATCH IS IN EFFECT... $$ ...CHUUK... ...TROPICAL STORM WARNING REMAINS IN EFFECT FOR CHUUK... .PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Tropical Storm Sinlaku (04W). Heed the advise of your local emergency managers and officials and monitor forecasts by your local National Weather Service office. Remain in a sturdy shelter until the all clear is given. ...WIND INFORMATION... West to southwest winds of 45 to 65 mph are now occurring in western coastal waters. Due to the very slowly, nearly stationary, movement of Tropical Storm Sinlaku (04W), these winds will spread eastward as Sinlaku strengthens. Sinlaku will move very slowly through the region, maintaining sustained tropical storm force winds through late Saturday night. ...COASTAL INUNDATION AND SURF INFORMATION... Seas of 12 to 14 feet are expected, with the highest seas over the western waters. This will result in dangerous surf of 14 to 16 feet along south and west-facing reefs, with 1 to 3 feet of inundation likely. ...OTHER STORM EFFECTS... Another 8 to 12 inches of additional rainfall, with locally higher amounts, are possible through the weekend. This will produce localized flooding and continue to increase the chance of mudslides. && ...FANANU... ....TROPICAL STORM WARNING REMAINS IN EFFECT FOR FANANU... .PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Tropical Storm Sinlaku (04W). Heed the advise of your local emergency managers and officials and monitor forecasts by your local National Weather Service office. Remain in a sturdy shelter until the all clear is given. .WIND INFORMATION... South to southeast to southwest winds of 40 to 60 mph will continue through Sunday morning. As TS Sinlaku moves very slowly through the region, the threat for sustained winds will linger over the island longer than expected. .Coastal Inundation and Surf Information... Seas of 12 to 15 feet are possible. This will result in dangerous surf of 13 to 16 feet and inundation around 1 to 3 feet along southeast to southwest facing reefs. .OTHER STORM EFFECTS... Another 5 to 10 inches of additional rainfall, with locally higher amounts, are possible through the weekend. && ...ULUL... ...TYPHOON WATCH REMAINS IN EFFECT FOR ULUL... ...TROPICAL STORM WARNING REMAINS IN EFFECT FOR ULUL... .PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Tropical Storm Sinlaku (04W). Heed the advise of your local emergency managers and officials and monitor forecasts by your local National Weather Service office. Remain in a sturdy shelter until the all clear is given. .WIND INFORMATION... Northwest winds becoming westerly at 45 to 70 mph. As TS Sinlaku moves through the region, the threat for sustained winds will continue. If Tropical Storm Sinlaku (04W) strengthens faster than currently forecast, winds could reach typhoon strength. The latest forecast is for tropical storm winds persisting through the weekend. A general concern should be for the possibility of destructive winds somewhere within the area. .Coastal Inundation and Surf Information... Seas of 13 to 17 feet are possible. This will result in dangerous surf of 14 to 18 feet and coastal inundation of up to 3 feet. .OTHER STORM EFFECTS... Additional heavy rainfall of 8 to 12 inches is possible as Sinlaku passes. This will produce localized flooding. && ...POLOWAT... ...TROPICAL STORM WARNING REMAINS IN EFFECT FOR POLOWAT... .PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay indoors during heavy rain and windy conditions associated with Tropical Storm Sinlaku (04W). It is important to actively listen for forthcoming information from your local National Weather Service office and emergency management office. .WIND INFORMATION... Northwest winds becoming westerly at 45 to 65 mph. The latest forecast is for tropical storm winds starting this afternoon. Winds will gradually become west, then southwest as Fananu passes to the north. .Coastal Inundation and Surf Information... Seas of 13 to 17 feet are possible. This will result in hazardous surf of 14 to 18 feet and inundation of up to 3 feet. .OTHER STORM EFFECTS... Heavy rainfall of 8 to 14 inches is possible as TS Sinlaku passes. This will produce localized flooding. $$ Montvila