Active Weather Alerts
Flood Watch
Issued: 6:53 PM Apr. 12, 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 expected to approach the Marianas over the next 12 to 36 hours, crossing near or over Tinian and Saipan Tuesday night. Rainfall amounts upwards of 15 to 25 inches are possible near the center. - With the recent northward shifts in the track, rainfall totals of 6 to 12 inches, with locally higher amounts, are more likely for Guam. - Http://www.weather.gov/safety/flood - 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. &&
High Surf Warning
Issued: 6:39 PM Apr. 12, 2026 – National Weather Service
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM CHST THURSDAY... ...COASTAL FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY AFTERNOON... * WHAT...For the High Surf Warning, dangerously large breaking waves of 10 to 15 feet for Guam and 15 to 25 ft for Rota, Tinian and Saipan. For the Coastal Flood Watch, significant coastal flooding 1 to 3 ft for Guam, and 3 to 7 ft for Rota, Tinian, and Saipan are possible. * WHERE...North, east and south facing reefs of the Marianas. For the Coastal Flood Watch, north, east, and south facing shorelines. * WHEN...For the High Surf Warning, until 6 PM ChST Thursday. For the Coastal Flood Watch, from 6 AM ChST Monday through Wednesday afternoon. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. Some shoreline erosion may 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 moves towards the Marianas swell and surf are expected to rapidly build. This will generate dangerous surf and increase the risk for coastal inundation, especially as STY Sinlaku begins to move through the Marianas on Tuesday. 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 Watch
Issued: 6:39 PM Apr. 12, 2026 – National Weather Service
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM CHST THURSDAY... ...COASTAL FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY AFTERNOON... * WHAT...For the High Surf Warning, dangerously large breaking waves of 10 to 15 feet for Guam and 15 to 25 ft for Rota, Tinian and Saipan. For the Coastal Flood Watch, significant coastal flooding 1 to 3 ft for Guam, and 3 to 7 ft for Rota, Tinian, and Saipan are possible. * WHERE...North, east and south facing reefs of the Marianas. For the Coastal Flood Watch, north, east, and south facing shorelines. * WHEN...For the High Surf Warning, until 6 PM ChST Thursday. For the Coastal Flood Watch, from 6 AM ChST Monday through Wednesday afternoon. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. Some shoreline erosion may 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 moves towards the Marianas swell and surf are expected to rapidly build. This will generate dangerous surf and increase the risk for coastal inundation, especially as STY Sinlaku begins to move through the Marianas on Tuesday. 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: 6:13 PM Apr. 12, 2026 – National Weather Service
...TYPHOON WARNING REMAINS IN EFFECT... * WHAT...Typhoon Warning. Tropical storm force winds of 40 to 60 kt are expected as early as this evening, with typhoon force winds of 64 kt or greater late Tuesday morning or early afternoon of Tuesday. Seas are building to 30 feet or more by Tuesday. * WHERE...Rota, Tinian, and Saipan Coastal Waters. * WHEN...Through at least Wednesday afternoon * IMPACTS...Conditions will be catastrophic for small craft and extremely dangerous for large vessels. Seek safe harbor as soon as possible. * ADDITIONAL DETAILS...Tropical storm winds are expected to move into the waters this evening with Typhoon Winds late Tuesday morning or early Tuesday afternoon. The past few forecasts have shifted the track northward, so strongest winds will likely be around Tinian and Saipan. PRECAUTIONARY/PREPAREDNESS ACTIONS... A typhoon warning means sustained winds of 64 kt or 74 mph or greater are expected. &&
Typhoon Warning
Issued: 5:42 PM Apr. 12, 2026 – National Weather Service
...TYPHOON WARNING IN EFFECT... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... The window of time to complete preparations for the protection of life and property will be closing later today. If evacuating to a public shelter, leave as soon as possible. Guard against being stuck out on roadways when dangerous winds and heavy rains arrive. Again, do not stay in a metal roof or container home. Items to bring to a shelter include a first aid kit, medicines and prescriptions, baby food and diapers, games and books, toiletries, a battery powered radio, a cell phone, flashlights with extra batteries, a blanket or sleeping bag for each person, personal identification, copies of key papers such as insurance policies, available cash and credit cards. Remember, pets are not allowed in most public shelters, so check ahead with your intended shelter. Regarding your home or business, finish covering all windows and doors with shutters or plywood. Move patio furniture and other loose objects indoors. Brace all exterior doors. 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, the threat for sustained; high winds will continue to increase. The latest forecast is for; Tropical storm force winds to begin affecting Rota, Tinian and Saipan; Monday evening or Monday night, with Typhoon force winds developing; Tuesday. The recent storm tracks have continued to shift the track of; STY Sinlaku northward 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; may diminish. For now the forecast has northerly tropical storm; winds around 39 to 45 mph, expected to become northwest to west and; increasing to 55 to 65 mph with gusts to 80 mph Tuesday with the; potential for typhoon force winds of around 75 mph possible. Tropical; storm winds are expected to continue into Wednesday as winds shift; to the southwest.; For Tinian and Saipan, the current track has Sinlaku passing near or; over Tinian and Saipan. This is forecasted to bring winds around 130; to 155 mph with gusts to 190 mph. 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 18 to 25 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 still possible as surf and wind driven waves; increase as tropical storm force winds arrive. For Tinian and Saipan; inundation of of at least 4-7 feet is possible, especially along; windward facing beaches and reefs. A Coastal Flood Watch 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 in the second half of the week,; as swells will continue to pummel western Marianas shores.; ...OTHER STORM EFFECTS...; Heavy, intense rainfall with TY Sinlaku is likely for much of the; week, with microwave satellite rainfall estimates showing amounts; upwards of 15 to 25 inches near the center. 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.
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