9:00 a.m. Heavy Showers and Gusty Winds Expected as Developing Circulation Moves Toward the Southern Marianas

The National Weather Service (NWS) Guam Weather Forecast Office continues to monitor what is now designated as Invest 90W, a low level circulation near 9N145E. The system is expected to move northwest before turning west-northwest near or south of the Marianas.

What to Expect

Increasingly gusty easterly winds will become southeasterly Wednesday night into Thursday with sustained winds of 20 to 30 mph and gusts to 40 mph possible. Further strengthening of the wind fields is possible if 90W tracks farther north, closer to the Marianas.

Periods of heavy rainfall could bring 4 to 8 inches of rain through Friday. This could lead to an increased risk of mudslides across steeper terrain. A flood watch is in effect for Guam and Rota from late tonight through Friday afternoon. Flooding caused by excessive rainfall is expected.

Seas of 5 to 8 feet will increase to 8 to 10 feet Wednesday night. Conditions will likely become hazardous to small craft late Wednesday night. Minor coastal inundation and increasing surf are also expected.

Preparedness Actions

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

Clear drainage areas and unblock storm drains to minimize flooding;
Stay up to date with the latest weather information;
When driving in heavy rain, be alert for low visibilities and slippery roads;
Slow down where water is ponding on the road;
Turn Around, Don’t Drown. Avoid walking or driving through flood waters. Just 6 inches of moving water can knock you down, and 2 feet of water can sweep your vehicle away;
Do not camp, park, or hike along streams and rivers. These areas can flood quickly and with little warning;
Be alert for possible landslides in areas of steep terrain. Be alert for hillsides or slopes that appear saturated or unstable. Look for warning signs such as cracks in the ground, leaning trees, or sudden changes in water flow. Report any signs of potential landslides to local authorities immediately.

The Office of Homeland Security and the Office of Civil Defense (OHS-OCD) reminds the community to stay alert for additional advisories in the coming days.

Visit the following links for the latest advisory information:

NWS Website: https://www.weather.gov/gum/
NWS Facebook: https://www.facebook.com/NWSGuam/
GHS/OCD Website: https://ghs.guam.gov/
GHS/OCD Facebook: https://www.facebook.com/GHSOCD/

For more information, contact Public Information Officer Jenna G. Blas at (671) 489-2540 or via email at jenna.g.blas@ghs.guam.gov.

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.