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June 2018 is Typhoon Preparedness Month

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6:30 a.m. Hazardous Seas, Surf and Strong Rip Currents through Thursday; Heavy Rainfall Possible through Wednesday Afternoon

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. 

GHS/OCD, NBG, and AAFB to Conduct Routine Testing of Advanced Warning Systems

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.

Hazardous Surf and Seas Expected through Tuesday; Advisories in Effect

The National Weather Service (NWS) Weather Forecast Office Guam has the following advisories in effect:

A high surf advisory is in effect for Guam, Rota, Tinian, and Saipan from 5 p.m. this afternoon to 5 p.m. Tuesday. Large breaking waves of 8 to 10 feet are expected for north facing reefs of the Marianas. Dangerous swimming and surfing conditions and localized beach erosion are expected. Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

Be Cautious of Phishing Attempts and Scam Messages

The Office of Guam Homeland Security and the Office of Civil Defense (OHS-OCD) were made aware that the Office of Technology (OTECH), along with the Mariana Regional Fusion Center (MRFC), received reports of a purported phishing email attempting to get users to click on a link for documents. The email is seemingly a scam and attempt to get the user to engage further.

Phishing emails often masquerade as internal IT requests, payroll updates, or urgent "unpaid invoice" notices. Before engaging with any email, perform these checks:

    Earthquake Recorded

    The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 5.5 that struck 48 km N of Yigo Village, Guam with a depth of 152.0 km, at 8:30 p.m. (ChST).

    As advised by the Pacific Tsunami Warning Center, there is no tsunami threat to the Marianas from the earthquake. There were no major damages or injuries reported from the earthquake.

    Guam Homeland Security Conducted Cybersecurity Tabletop Exercise Black Hydra

    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.

    1:45 p.m. Hazardous Surf and Seas Remain; Advisories in Effect

    The National Weather Service (NWS) Weather Forecast Office Guam has the following advisories in effect:

    A high surf advisory remains in effect for Guam, Rota, Tinian, and Saipan until 6 p.m. Thursday. Large breaking waves of 9 to 12 feet are expected for west and north facing reefs of the Marianas. Dangerous swimming and surfing conditions and localized beach erosion are expected. Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

    6:50 a.m. Increased Showers Expected, Locally Heavy Rainfall Possible; Hazardous Surf and Seas Remain

    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.

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