Active Weather Alerts
High Surf Warning
Issued: 12:14 AM Apr. 15, 2026 – National Weather Service
...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CHST THURSDAY... ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM CHST THURSDAY... * WHAT...For the Coastal Flood Warning, significant coastal flooding, up to 10 feet for Tinian and Saipan; 6 feet for Rota, and up to 4 feet for Guam. For the High Surf Warning, dangerously large breaking waves of 11 to 16 feet for Guam, 15 to 20 feet for Rota, and 20 to 30 feet for Tinian and Saipan. * WHERE...North, east, south, and west facing reefs of Tinian and Saipan. South, west, and north facing reefs of Guam and Rota. * WHEN...For the Coastal Flood Warning, until 5 AM ChST Thursday. For the High Surf Warning, until 6 PM ChST Thursday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and significant beach erosion can be expected. * ADDITIONAL DETAILS...As TY Sinlaku moves away and wind driven waves decrease, the primary swell and highest surf will shift toward the northwest. The Coastal Flood Warning may need to be extended for Tinian and Saipan if Sinlaku slows down a bit. PRECAUTIONARY/PREPAREDNESS ACTIONS... Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure. &&
Coastal Flood Warning
Issued: 12:14 AM Apr. 15, 2026 – National Weather Service
...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CHST THURSDAY... ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM CHST THURSDAY... * WHAT...For the Coastal Flood Warning, significant coastal flooding, up to 10 feet for Tinian and Saipan; 6 feet for Rota, and up to 4 feet for Guam. For the High Surf Warning, dangerously large breaking waves of 11 to 16 feet for Guam, 15 to 20 feet for Rota, and 20 to 30 feet for Tinian and Saipan. * WHERE...North, east, south, and west facing reefs of Tinian and Saipan. South, west, and north facing reefs of Guam and Rota. * WHEN...For the Coastal Flood Warning, until 5 AM ChST Thursday. For the High Surf Warning, until 6 PM ChST Thursday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and significant beach erosion can be expected. * ADDITIONAL DETAILS...As TY Sinlaku moves away and wind driven waves decrease, the primary swell and highest surf will shift toward the northwest. The Coastal Flood Warning may need to be extended for Tinian and Saipan if Sinlaku slows down a bit. PRECAUTIONARY/PREPAREDNESS ACTIONS... Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure. &&
Tropical Storm Warning
Issued: 11:30 PM Apr. 14, 2026 – National Weather Service
...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. Strong tropical storm force winds are still near the island to the north, but will start to slowly decrease later this morning. 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 tropical storm force winds around 40 to 50; mph and gusts up 70 mph will continue through the morning hours.; 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.
Typhoon Watch
Issued: 11:30 PM Apr. 14, 2026 – National Weather Service
...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. Strong tropical storm force winds are still near the island to the north, but will start to slowly decrease later this morning. 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 tropical storm force winds around 40 to 50; mph and gusts up 70 mph will continue through the morning hours.; 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.
Tropical Storm Warning
Issued: 11:16 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... * WHAT...For the Tropical Storm Warning, west winds 35 to 45 kt with gusts to 65 kt and shifting to the southwest. Seas are slowly subsiding, but remain around 15 to 24 feet. For the Typhoon Watch, typhoon conditions possible. * WHERE...Guam Coastal Waters. * WHEN...Through at least Wednesday night. * IMPACTS...Damaging winds will maintain hazardous seas which could capsize or damage vessels and reduce visibility. Conditions will be dangerous for small craft and large vessels. Remain in safe harbor. * ADDITIONAL DETAILS...Tropical storm winds are occurring. Winds have already peaked and are expected to slowly subside through tonight. PRECAUTIONARY/PREPAREDNESS ACTIONS... A tropical storm warning means sustained winds of 34 to 63 kt or 39 to 73 mph are expected or occurring. &&
Typhoon Watch
Issued: 11:16 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... * WHAT...For the Tropical Storm Warning, west winds 35 to 45 kt with gusts to 65 kt and shifting to the southwest. Seas are slowly subsiding, but remain around 15 to 24 feet. For the Typhoon Watch, typhoon conditions possible. * WHERE...Guam Coastal Waters. * WHEN...Through at least Wednesday night. * IMPACTS...Damaging winds will maintain hazardous seas which could capsize or damage vessels and reduce visibility. Conditions will be dangerous for small craft and large vessels. Remain in safe harbor. * ADDITIONAL DETAILS...Tropical storm winds are occurring. Winds have already peaked and are expected to slowly subside through tonight. PRECAUTIONARY/PREPAREDNESS ACTIONS... A tropical storm warning means sustained winds of 34 to 63 kt or 39 to 73 mph are expected or occurring. &&
Flood Watch
Issued: 4:43 PM Apr. 14, 2026 – National Weather Service
...FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Guam, Rota, Saipan and Tinian. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Typhoon Sinlaku is starting to move away from Tinian and Saipan to the northwest. rain bands south of Sinlaku will continue to bring periods of heavy rain across the islands. - Based on microwave satellite estimates and model guidance, additional rainfall of 10 to 18 inches is possible for Tinian and Saipan. For Guam and Rota, 5 to 10 inches of additional rainfall is possible over the next 24 hours. - Http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. &&
Airport Weather Warning
Issued: 10:11 AM Apr. 12, 2026 – National Weather Service
An Airport Wind Advisory is in effect for the Guam International Airport. The onset of tropical storm force conditions are expected within 24 hours and this advisory will remain in effect until further notice. Expect winds from the NNE or 20 degrees at 15 to 25 knots with gusts to 35 knots and will continue to increase and shift northwest as Super Typhoon Sinlaku approaches the Marianas. Tropical storm conditions are expected Monday night through Wednesday, with typhoon conditions possible. For specific wind information and updates, see the latest typhoon local statement, under the WMO header WTPQ81 PGUM or on our website at: www.weather.gov/gum/cyclones.
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