Active Weather Alerts
High Surf Warning
Issued: 12:40 PM Apr. 14, 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. For the High Surf Warning, dangerously large breaking waves of 11 to 16 for Guam, 15 to 20 feet for Rota, and 20 to 30 feet for Tinian and Saipan. * WHERE...All 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 STY Sinlaku crosses the Marianas over or near Tinian and Saipan, swell and highest surf will shift toward the north and west. This will maintain dangerous surf and coastal inundation as STY Sinlaku continues through the Marianas tonight through Wednesday. Inundation has been reported on Guam and in Saipan. Tinian and Saipan could see wave and wind driven surf push water on to land up to 10 to 15 feet higher than the water- level, especially along windward facing beaches and shores. 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: 12:40 PM Apr. 14, 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. For the High Surf Warning, dangerously large breaking waves of 11 to 16 for Guam, 15 to 20 feet for Rota, and 20 to 30 feet for Tinian and Saipan. * WHERE...All 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 STY Sinlaku crosses the Marianas over or near Tinian and Saipan, swell and highest surf will shift toward the north and west. This will maintain dangerous surf and coastal inundation as STY Sinlaku continues through the Marianas tonight through Wednesday. Inundation has been reported on Guam and in Saipan. Tinian and Saipan could see wave and wind driven surf push water on to land up to 10 to 15 feet higher than the water- level, especially along windward facing beaches and shores. 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: 12:20 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... * WHAT...For the Tropical Storm Warning, northwest winds 40 to 50 kt with gusts to 75 kt and shifting to the west. Seas are slowly subsiding, but remain around 18 to 26 feet. For the Typhoon Watch, typhoon conditions possible. * WHERE...Guam Coastal Waters. * WHEN...Through at least Wednesday night. * IMPACTS...Damaging winds will cause 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 and 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: 12:20 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH REMAINS IN EFFECT... * WHAT...For the Tropical Storm Warning, northwest winds 40 to 50 kt with gusts to 75 kt and shifting to the west. Seas are slowly subsiding, but remain around 18 to 26 feet. For the Typhoon Watch, typhoon conditions possible. * WHERE...Guam Coastal Waters. * WHEN...Through at least Wednesday night. * IMPACTS...Damaging winds will cause 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 and 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. &&
Tropical Storm Warning
Issued: 12:03 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH 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 and will continue through the overnight hours before starting to decrease Wednesday morning. Due to the size of the storm, tropical storm force winds are not expected to end until late Wednesday evening. Even when winds start to decrease, remain indoors until the government of Guam gives the "all clear". && ...WIND INFORMATION...; As the eye of Super Typhoon Sinlaku (04W) continues to move toward; Tinian and Saipan, Guam will continue to see west strong tropical; storm force winds around 50 to 60 mph and gusts up 75 mph through; the overnight hours. Then, tropical storm force winds are forecasted; slowly subside Wednesday as winds shift to the southwest forecasted; to subside below 39 mph late Wednesday evening.; ...COASTAL INUNDATION AND SURF INFORMATION...; Dangerous surf of 13 to 18 feet are occurring across south, west, and; 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 dangerous at around 11 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 is still expected so the; 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 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 rainbands rotate across Guam south of Sinlaku and will likely; continue to do so through at least Wednesday morning, before; shifting to the northwest of the island. 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.
Typhoon Watch
Issued: 12:03 PM Apr. 14, 2026 – National Weather Service
...TROPICAL STORM WARNING REMAINS IN EFFECT... ...TYPHOON WATCH 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 and will continue through the overnight hours before starting to decrease Wednesday morning. Due to the size of the storm, tropical storm force winds are not expected to end until late Wednesday evening. Even when winds start to decrease, remain indoors until the government of Guam gives the "all clear". && ...WIND INFORMATION...; As the eye of Super Typhoon Sinlaku (04W) continues to move toward; Tinian and Saipan, Guam will continue to see west strong tropical; storm force winds around 50 to 60 mph and gusts up 75 mph through; the overnight hours. Then, tropical storm force winds are forecasted; slowly subside Wednesday as winds shift to the southwest forecasted; to subside below 39 mph late Wednesday evening.; ...COASTAL INUNDATION AND SURF INFORMATION...; Dangerous surf of 13 to 18 feet are occurring across south, west, and; 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 dangerous at around 11 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 is still expected so the; 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 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 rainbands rotate across Guam south of Sinlaku and will likely; continue to do so through at least Wednesday morning, before; shifting to the northwest of the island. 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.
Flood Watch
Issued: 8:56 AM Apr. 14, 2026 – National Weather Service
...FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY MORNING... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Guam, Rota, Saipan and Tinian. * WHEN...Through Wednesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Super Typhoon Sinlaku is is approaching Tinian and Saipan tonight. Rainfall amounts upwards of 15 to 25 inches are possible near the center. - With a track near or over Saipan, rainfall totals of 6 to 12 inches, with locally higher amounts, are more likely for Guam, with 10 to 18 inches for Rota. - 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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