Active Weather Alerts
Flood Advisory
Issued: 4:44 AM Apr. 15, 2026 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 5 PM CHST THIS AFTERNOON... ...REPLACES FLASH FLOOD WARNING... * WHAT...Urban and small stream flooding caused by excessive rainfall is expected. A heavy rainband of Typhoon Sinlaku has shifted to the east, however, widespread showers will continue to produce minor flooding. * WHERE...Saipan and Tinian. * WHEN...Until 500 PM ChST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 241 PM ChST, satellite estimates indicate heavy rain in the advisory area. This will cause urban and small stream flooding. - Additional rainfall amounts of 2 to 4 inches are expected over the area. This additional rain will result in minor flooding. Periods of rainfall is still expected through tonight as additional rainbands train over the area, possibly needing an extension of the advisory. - Some locations that will experience flooding include... Garapan, Dandan, China Town, Tanapag, As Mahetog, Koblerville, San Jose (Tinian Municipality), Chalan Kanoa I, San Antonio, Chalan Kanoa II, Chalan Kanoa III, San Roque, Kagman, Chalan Kanoa IV, Kagman III, Gualo Rai, Afetnas, Chalan Piao, Fananganan and Chalan Laulau. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. &&
High Surf Warning
Issued: 5:58 AM Apr. 15, 2026 – National Weather Service
...COASTAL FLOOD WARNING NOW IN EFFECT UNTIL NOON CHST FRIDAY... ...HIGH SURF WARNING NOW IN EFFECT UNTIL 5 PM CHST FRIDAY... * WHAT...For the Coastal Flood Warning, significant coastal flooding up to 10 feet. For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet. * WHERE...South, west, and north facing reefs and shorelines. * WHEN...For the Coastal Flood Warning, until noon ChST Friday. For the High Surf Warning, until 5 PM ChST Friday. * 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 continues to move away and wind driven waves decrease, the primary swell and highest surf will become southwest. Seas will be slow to subside over the next couple of days. A High Surf Advisory may continue into the weekend. 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: 5:58 AM Apr. 15, 2026 – National Weather Service
...COASTAL FLOOD WARNING NOW IN EFFECT UNTIL NOON CHST FRIDAY... ...HIGH SURF WARNING NOW IN EFFECT UNTIL 5 PM CHST FRIDAY... * WHAT...For the Coastal Flood Warning, significant coastal flooding up to 10 feet. For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet. * WHERE...South, west, and north facing reefs and shorelines. * WHEN...For the Coastal Flood Warning, until noon ChST Friday. For the High Surf Warning, until 5 PM ChST Friday. * 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 continues to move away and wind driven waves decrease, the primary swell and highest surf will become southwest. Seas will be slow to subside over the next couple of days. A High Surf Advisory may continue into the weekend. 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. &&
Typhoon Warning
Issued: 5:57 AM Apr. 15, 2026 – National Weather Service
...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.
Typhoon Warning
Issued: 5:39 AM Apr. 15, 2026 – National Weather Service
...TYPHOON WARNING REMAINS IN EFFECT... * WHAT...Typhoon Warning. For Rota, tropical storm force winds of 35 to 50 kt, with gusts to 70 kt. Seas will continue to slowly subside and are between 22 and 26 feet. For Tinian and Saipan, typhoon force winds of up to 95 kt with gusts to 115 kt. Seas are now subsiding and are between 26 to 35 feet. * WHERE...Rota, Tinian, and Saipan Coastal Waters. * WHEN...Through at least Thursday afternoon. * IMPACTS...Conditions will be catastrophic for small craft and large vessels. Remain in safe harbor. * ADDITIONAL DETAILS...Tropical storm winds are occurring at Rota, with typhoon winds of up to 95 kt currently over the northern waters of Tinian and Saipan. Winds are likely below typhoon force south of Tinian. Winds and seas will continue to very slowly decrease over the next 24 hours. Seas will be highest over the northern portions of the waters. PRECAUTIONARY/PREPAREDNESS ACTIONS... A typhoon warning means sustained winds of 64 kt or 74 mph or greater 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. &&
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