Guam Homeland Security - Office of Civil Defense

X Flooding is a temporary overflowing of water onto land that is normally dry. Flooding may happen with only a few inches of water, or it may cover a house to the rooftop. There are many possible causes of floods including heavy rain, coastal storms and storm surge, waterway overflow from being blocked with debris, or overflow of levees, dams, or waste water systems. Flooding can occur slowly over many days or happen very quickly with little or no warning, called flash floods.

To learn more, visit https://www.ready.gov/floods

Wildfire

Regularly clean the roof and gutters.
Maintain an area approximately 30’ away from you home that is free of anything that will burn, such as wood piles, dried leaves, newspapers and other brush.
Connect garden hoses long enough to reach any area of the home and fill garbage cans, tubs, or other large containers with water.
Review your homeowner's insurance policy and also prepare/update a list of your home's contents.

Fire Weather

Turn on your TV/radio. You’ll get the latest weather updates and emergency instructions.
Know where to go. If you are ordered to evacuate, know the route to take and have plan of where you will go. Check-in with your friends and family.
Keep your car fueled, in good condition, and stocked with emergency supplies and a change of clothes.

Drought

Conserve water

Take shorter showers.

Turn off the water while brushing your teeth or shaving.
Run the washer less frequently and only when you have a full load.
Water your lawn less frequently and do so when the temperature is cooler in the early morning or late evening.
When you run the tap to heat or cool water, keep a pitcher to store the water and use it to water plants.
Avoid washing your car.

Practice fire prevention

Don't set off fireworks when conditions are dry.
Deposit cigarette butts in the proper receptacle to avoid starting a
Pour water over camp fires and backyard fire pits to ensure they are completely out before leaving them unattended.

Follow directions from local officials. If there are restrictions on water usage, be sure to heed them.

To learn more, visit https://www.ready.gov/wildfires and https://www.ready.gov/drought

X
Typhoons/Hurricanes are massive storm systems that form over the water and move toward land. Threats from typhoons/hurricanes include high winds, heavy rainfall, storm surge, coastal and inland flooding, and rip currents.

“Hurricanes” form in the Atlantic Northeast Pacific region and “Typhoons” form in the Northwest Pacific Region. These large storms are call cyclones in other parts of the world.

To learn more, visit https://www.ready.gov/hurricanes.

1:30 p.m. Flood Advisory in Effect; Practice Caution

The National Weather Service (NWS) Guam Weather Forecast Office issued a flood advisory, in effect for Guam until 3 p.m. this afternoon. Flooding caused by excessive rainfall is expected. Additional rainfall amounts of 1 to 2 inches are expected over the area.

Some areas that will experience flooding include Dededo, Tamuning, Yigo, Mangilao, Chalan Pago-Ordot, Barrigada, Yona, Agana Heights, Andersen AFB, Talofofo, Mongmong-Toto-Maite, Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita, and Umatac.

Read more about 1:30 p.m. Flood Advisory in Effect; Practice Caution

1:00 p.m. OHS-OCD Promotes September as National Preparedness Month

The Office of Guam Homeland Security and the Office of Civil Defense (OHS-OCD) invite the island to celebrate September as National Preparedness Month (NPM). To commemorate the month, Governor Lou Leon Guerrero will declare NPM with a proclamation signing on Friday, September 5, 2025 at 9:30 a.m. at the Ricardo J. Bordallo Governor’s Complex, Large Conference Room.

NPM is an observance each September to raise awareness about the importance of preparing for disasters and emergencies that could happen at any time.

Read more about 1:00 p.m. OHS-OCD Promotes September as National Preparedness Month

6:15 p.m. Press Release - Thunderstorm Warning in Effect; Practice Caution

The National Weather Service (NWS) Guam Weather Forecast Office issued a special weather statement for Guam. A strong thunderstorm is over the eastern coast and waters of Guam with frequent intense lightning.

Mariners can expect gusty winds to around 25 knots, locally higher waves, lightning strikes, and heavy downpours. Boaters should seek harbor immediately until these storms pass. If caught on the open water, stay below deck if possible, keep away from ungrounded metal objects.

Read more about 6:15 p.m. Press Release - Thunderstorm Warning in Effect; Practice Caution

3:13 p.m. Press Release - Earthquake Recorded

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 6.1 that struck 117 km ESE of Yigo Village, Guam, with a depth of 10.0 km, at 2:56 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 for Guam reported from the earthquake.

Read more about 3:13 p.m. Press Release - Earthquake Recorded

7:00 p.m. Press Release - Flood Advisory in Effect; Practice Caution

The National Weather Service (NWS) Guam Weather Forecast Office issued a flood advisory, in effect for Guam until 8:30 p.m. this evening. Urban and small stream flooding caused by excessive rainfall is expected. Between 0.5 and 1 inch of rain has fallen. Additional rainfall amounts of 1 to 2 inches are expected.

Some areas that will experience flooding include Tamuning, Mangilao, Chalan Pago-Ordot, Barrigada, Yona, Agana Heights, Talofofo, Mongmong-Toto-Maite, Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita, and Umatac.

Read more about 7:00 p.m. Press Release - Flood Advisory in Effect; Practice Caution

6:40 p.m. Press Release - UPDATE: Tsunami Advisory Canceled for Guam and CNMI

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 8.0, that was later upgraded to magnitude of 8.8, that occurred 133 km SE of Petropavlovsk-Kamchatsky, Russia with a depth of 74.0 km, at 9:24 a.m. (ChST).

As advised by the Pacific Tsunami Warning Center, the Tsunami Advisory has been canceled for Guam and CNMI. Based on all available data there is no further tsunami threat to Guam, Rota, Tinian, or Saipan from the earthquake although minor sea level fluctuations may continue.

Read more about 6:40 p.m. Press Release - UPDATE: Tsunami Advisory Canceled for Guam and CNMI

5:40 p.m. Press Release - UPDATE: Tsunami Advisory Remains in Effect for Guam and CNMI

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 8.0, that was later upgraded to magnitude of 8.8, that occurred 133 km SE of Petropavlovsk-Kamchatsky, Russia with a depth of 74.0 km, at 9:24 a.m. (ChST).

The Tsunami Advisory remains in effect for Guam and CNMI. Potential impacts include sea level fluctuations, minor flooding of beach and harbor areas, and strong and unusual ocean currents in harbors, bays, and other near shore waters.

Read more about 5:40 p.m. Press Release - UPDATE: Tsunami Advisory Remains in Effect for Guam and CNMI

4:35 p.m. Press Release - UPDATE: Tsunami Advisory Continues for Guam and CNMI

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 8.0, that was later upgraded to magnitude of 8.8, that occurred 133 km SE of Petropavlovsk-Kamchatsky, Russia with a depth of 74.0 km, at 9:24 a.m. (ChST).

The Tsunami Advisory remains in effect for Guam and CNMI.

Remain out of the water. The community is advised to move inland, away from beaches.

Potential impacts include sea level fluctuations, minor flooding of beach and harbor areas, and strong and unusual ocean currents in harbors, bays, and other near shore waters.

Read more about 4:35 p.m. Press Release - UPDATE: Tsunami Advisory Continues for Guam and CNMI

3:05 p.m. Press Release - UPDATE: Stay Out of the Water, Away from Beaches; Tsunami Advisory Remains in Effect for Guam and CNMI

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 8.0, that was later upgraded to magnitude of 8.7, that occurred 133 km SE of Petropavlovsk-Kamchatsky, Russia with a depth of 74.0 km, at 9:24 a.m. (ChST).

Based on available data from the Pacific Tsunami Warning Center, a Tsunami Advisory remains in effect for Guam, Rota, Tinian, and Saipan.

Read more about 3:05 p.m. Press Release - UPDATE: Stay Out of the Water, Away from Beaches; Tsunami Advisory Remains in Effect for Guam and CNMI

11:00 a.m. Press Release - UPDATE: Guam and CNMI Upgraded to a Tsunami Advisory

UPDATE: Guam and CNMI Upgraded to a Tsunami Advisory

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 8.0, that was later upgraded to magnitude of 8.7, that occurred 133 km SE of Petropavlovsk-Kamchatsky, Russia with a depth of 74.0 km, at 9:24 a.m. (ChST)
Based on all available data, there is a threat to Guam, Rota, Tinian, and Saipan, of sea level fluctuations and strong ocean currents that could be hazardous along beaches, in harbors, and in coastal waters.

Read more about 11:00 a.m. Press Release - UPDATE: Guam and CNMI Upgraded to a Tsunami Advisory

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Department of Homeland Security (DHS) Definition of Terrorism

June 2018 is Typhoon Preparedness Month

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