The National Weather Service (NWS) Guam Weather Forecast Office has issued a Flash Flood Watch for Guam, Rota, Saipan, and Tinian through Wednesday morning. While initial rainfall of 0.8 to 2.4 inches is expected to cause minor flooding today, the threat increases significantly as Typhoon Sinlaku approaches. 

Typhoon Sinlaku is projected to cross the Marianas on Tuesday, potentially bringing 15 to 20 inches of rain near its center; current tracking suggests 6 to 12 inches are probable for Guam, with locally higher amounts possible.

Guam, and the respective military bases, remain in Condition of Readiness (COR) 2, and Tropical Cyclone Condition of Readiness (TCCOR) 2 as of 5 p.m. this afternoon, April 12, 2026. 

JTF-M is postured and integrated with local and federal partners to respond as requested by appropriate authority. We are prepared to support civil authorities with professionalism, transparency, and unity of effort as conditions evolve.

Emergency Shelters Now Open

Governor Lou Leon Guerrero and Rear Adm. Brett Mietus has placed Guam, and the respective military bases, in Condition of Readiness (COR) 2, and Tropical Cyclone Condition of Readiness (TCCOR) 2 as of 5 p.m. this afternoon, April 12, 2026. 

JTF-M is postured and integrated with local and federal partners to respond as requested by appropriate authority. We are prepared to support civil authorities with professionalism, transparency, and unity of effort as conditions evolve.

Emergency Shelters Open at 6PM

Governor Lou Leon Guerrero and Rear Adm. Brett Mietus anticipate placing Guam, and the respective military bases, in Condition of Readiness (COR) 2, and Tropical Cyclone Condition of Readiness (TCCOR) 2 at 5 p.m. this afternoon, April 12, 2026. 

JTF-M continues to take preemptive measures to posture forces and resources for rapid response supporting our interagency and local partners. 

Weather Update

Governor Lou Leon Guerrero and Rear Adm. Brett Mietus anticipate placing Guam, and the respective military bases, in Condition of Readiness (COR) 2, and Tropical Cyclone Condition of Readiness (TCCOR) 2 at 5 p.m. this afternoon, April 12, 2026. 

Based on the recent weather brief received from the National Weather Service, Weather Forecast Office Guam, and to provide the community additional time to prepare, Governor Lou Leon Guerrero and Rear Adm. Brett Mietus anticipate placing Guam, and the respective military bases, in Condition of Readiness (COR) 2, and Tropical Cyclone Condition of Readiness (TCCOR) 2 at 5 p.m. this afternoon, April 12, 2026. 

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.