The National Weather Service (NWS) Weather Forecast Office Guam issued a hydrologic outlook for Guam, Rota, Tinian, and Saipan. A shear line is pushing southward near Guam and Rota, bringing showers, gusty winds and the potential for thunderstorms and locally heavy rainfall. 

The Offices of Guam Homeland Security and Civil Defense (GHS/OCD), U.S. Naval Base Guam (NBG), and Andersen Air Force Base (AAFB) will conduct routine testing of the vital communication and advance warning system sirens, respectively, on Tuesday, March 3, 2026, starting at 3:15 p.m.

GHS/OCD will test the All Hazards Alert Warning System (AHAWS) sirens in conjunction with NBG and AAFB monthly routine testing of the “Giant Voice (GV)” sirens.

Agana Heights, Guam – The Office of Guam Homeland Security and the Office of Civil Defense (OHS-OCD), in a joint effort with Joint Task Force-Micronesia (JTF-M), conducted Exercise Black Hydra today, a discussion-based cybersecurity tabletop exercise held at the OHS-OCD Initial Operating Facility (IOF) in Agana Heights on February 10, 2026.

The National Weather Service (NWS) Weather Forecast Office Guam has issued a flood advisory for Guam until 8:15 AM. Urban and small stream flooding from excessive rainfall is expected.

Between 0.4 to 1 inch of rain has fallen. Additional rainfall amounts of 0.4 to 1 inch are expected over the area. 

Residents and visitors are advised to take the following precautionary actions:

The National Weather Service (NWS) Weather Forecast Office Guam is currently monitoring a shear line over the CNMI and a weak tropical disturbance located south of Guam in eastern Yap state. Models suggest the disturbance will move west-northwestward, taking it between Yap and Guam, but closer to Yap.