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JIC Release No. 2 - Guam in COR 3; Stay Out of the Water; Prepare Now


Governor Lou Leon Guerrero placed Guam in Condition of Readiness (COR) 3 at 5 p.m., April 10, 2026. At COR 3, damaging winds of 39 mph or more are expected within 48 hours. Yesterday, Governor Lou Leon Guerrero signed Executive Order No. 2026-01 relative to declaring a state of emergency in anticipation of the approach of Tropical Storm Sinlaku. 

Rear Adm. Brett Mietus, commander, Joint Region Marianas, maintains Tropical Cyclone Condition of Readiness (TCCOR) “Storm Watch,” an internal readiness term enabling military installations to take preparatory actions, as of 10 a.m., April 10, which enables base commanders to take preparatory actions. If forecasts hold, the next announcement from JRM will be for TCCOR 3, indicating sustained winds greater than 50 knots (57 mph) are possible within 48 hours, which is an important key difference in storm condition thresholds.

Rear Adm. Josh Lasky, commander, Joint Task Force–Micronesia and his team are actively preparing to respond rapidly should assistance be requested by appropriate authority. When and if called upon, JTF-M is postured and prepared to execute Defense Support of Civil Authorities, (DSCA). Our forces are aligned to integrate seamlessly with local and federal partners, ensuring timely support. 

What to Expect

A typhoon watch is in effect for Guam. A typhoon watch means that there is a high possibility for damaging (39 mph) and/or destructive (58 mph) winds. 

Tropical Storm Sinlaku continues to organize north-northwest of Chuuk and is expected to strengthen as it approaches the Marianas, possibly crossing Guam as a Category 3 or Category 4 typhoon, with maximum sustained winds of 130 mph or more. 

  • Winds: expected to increase with conditions deteriorating sometime late Sunday with potential for Tropical Storm-Force winds of 39 mph around Monday morning, and potential for Typhoon-Force winds of 74 mph or more Monday evening into Tuesday morning. 

  • Rain: expected to produce 15 to 20 inches of rainfall between Sunday night and Wednesday for Guam. As showers are likely to persist, consistent rainfall is likely to produce flash floods and saturate the soils enough to increase the chance for mudslides over central to southern Guam.

Take Action Now

  • Stay Out of the Water! Hazardous surf and seas remain. 

    • High Surf Advisory (waves 8-12 ft.) until 6 p.m. Thursday

    • High Risk of Rip Currents for Guam, Rota, Tinian, and Saipan through Thursday afternoon

    • Small Craft Advisory for Guam, Rota, Tinian, and Saipan coastal waters (winds 20–25 kt; seas 9–13 ft), 

  • Plan for Emergency Shelter 

    • If movement out of your home is necessary ahead of the storm, have a shelter plan now. Coordinate now with family and friends regarding relocation or plan for movement once the government of Guam emergency shelter locations are announced. 

  • Clear drainage areas and unblock storm drains to minimize flooding; 

  • Stay up to date with the latest information;

  • Clear loose debris around your yard and store any items that may become airborne with heavy winds, such as canopies, tarps, and trampolines, before inclement weather arrives;

    • Secure construction sites

    • Take down signs  

  • Have an emergency kit prepared: Store enough food and water for your household for 7-10 days. Include medication, disinfectant supplies and pet supplies;

  • Secure important documents such as birth certificates, tax papers, and insurance documents and keep copies in a water-proof bag;

  • Review your emergency plan: If you do not have a plan, learn how to create an emergency plan; Have plans for your family members and pets. If you are a person with disabilities or a caregiver for elderly, you may need to take extra steps to plan for those additional needs.

  • Get emergency alerts: Stay informed by having a weather alert radio, battery-operated, or hand-crank radio, where you can listen to emergency news; 

  • Gas your vehicles and get fuel for your generators;

  • Pull cash from the ATM in case of power outages;  

  • Don’t drive through flood waters: Almost half of all flash flood deaths happen in vehicles. When in your car, look out for flooding in low-lying areas at bridges and at highway dips. As little as 6 inches of water may cause you to lose control of your vehicle.

Efforts Underway

In preparation of the storm’s approach, response efforts are underway. The Department of Public Works (DPW) has pre-staged heavy equipment in flood-prone areas and has begun clearing poor drainage areas, in partnership with village Mayors’ offices. The Guam Power Authority continues tree-trimming, especially around water well areas. The Guam Waterworks Authority is completing water and wastewater system preparations

The Port Authority of Guam has escalated its storm readiness posture following the U.S. Coast Guard’s declaration of Port Heavy Weather Condition X-Ray at 1:00 p.m., April 10, 2026. Under Condition X-Ray: All facilities must secure hazardous materials and potential flying debris; Commercial operators prepare to terminate cargo operations; and Vessels greater than 200 tons are directed to make plans to depart. Port Heavy Weather Condition Yankee is expected for 1 p.m. today. Zulu is expected late Sunday, timed 12 hours ahead of tropical storm force wind onset.

The U.S. Coast Guard cutters homeported in Apra Harbor are scheduled to depart the island ahead of tropical storm force winds. This is standard practice and is not a withdrawal of support. Repositioning preserves the cutter crews’ ability to return quickly and respond to post-storm emergencies, including search and rescue, once it is safe to operate. 

Airlines Update

The A.B. Won Pat International Airport Authority, Guam (GIAA) advises all passengers to sign up for mobile alerts and SMS messaging with their airlines to avoid unnecessary travel to the airport during unsafe weather conditions. Regularly check inbound and outbound flight status on their respective airline’s website, mobile applications. Flight status information is also available at www.guamairport.com.

GSYEP Childcare Application Acceptance Postponed

The Department of Youth Affairs is postponing the 2026 Governor’s Summer Youth Employment Program (GSYEP) childcare application period, originally set for April 17–24, due to current weather conditions. For questions, contact DYA at dya.youth.employment@dya.guam.gov or (671) 735-5037.

GRMC Temporarily Suspends Certain Operations

The Guam Regional Medical City (GRMC) is temporarily suspending clinic operations, rehabilitation, and OR services, One Stop Laboratory and Radiology services, beginning Monday, April 13 to 15, 2026. Visitation will also be temporarily suspended beginning Sunday, April 12, 2026 at 9 PM. Only designated patient watchers/overnighters will be allowed to remain with patients. Patients with affected appointments will be contacted directly by GRMC to assist with rescheduling and coordination of care. GRMC will continue to maintain essential hospital services, including 24/7 Emergency Room operations and inpatient care.

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