The National Weather Service (NWS) Guam Weather Forecast Office issued a hydrologic outlook for Guam, Rota, Tinian, and Saipan. Periods of heavy rainfall may develop this weekend into early next week. Currently, a broad and weak circulation is forming southwest of Chuuk and is expected to slowly head west-northwest towards the Marianas the next several days.
Locally heavy rainfall, and rainfall amounts of 5 to 10 inches, with gusty winds in heavier showers, are possible beginning late Friday through early to middle of next week.
Heavy rainfall could produce flooding of roadways and low-lying areas. Residents and visitors are advised to take the following precautionary actions:
- Those living in flood-prone areas should take action now; clear drainage areas and unblock storm drains to minimize flooding;
- Stay up to date with the latest information;
- If 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.
- When thunder roars, get indoors. Tents, canopies and tarps are not safe shelter during thunderstorms.
- Remain out of the water while advisories are in effect.
Advisories in Effect:
- High Surf Advisory for Guam, Rota, Tinian, and Saipan (7–10 ft surf) until 4 p.m. Monday.
- High Risk of Rip Currents for Guam, Rota, Tinian, and Saipan through Monday afternoon.
For the latest advisory information, visit:
- 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 Blas at (671) 475-9600 or via email at jenna.g.blas@ghs.guam.gov.







