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June 2018 is Typhoon Preparedness Month

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3 p.m. Wind Advisory in Effect Thursday to Friday

The National Weather Service (NWS) Guam Weather Forecast Office issued a wind advisory in effect for Guam and Rota from 7 a.m. Thursday to 4 p.m. Friday.

Southeast winds of 20 to 30 mph with gusts to 45 mph are expected. Gusty winds will blow around unsecured objects. Tree limbs could be blown down. Winds that strong could also make driving difficult, especially for high profile vehicles. Use extra caution when driving on roads with no center barriers, as well as when passing high profile vehicles.


Preparedness Actions

1:30 p.m. Periods of Heavy Showers and Gusty Winds Expected into Friday

The National Weather Service (NWS) Guam Weather Forecast Office is monitoring Tropical Depression 32W, located near 8.4N 143.3E, about 365 miles south-southwest of Guam, as of 1 PM. Tropical Depression 32W is nearly stationary, with maximum sustained winds of 35 mph. It is expected to begin moving toward the northwest tonight and increase in forward speed Thursday. The latest forecast track shows 32W, passing near or just northeast of Ulithi and Fais in Yap State on Thursday.

Earthquake Recorded

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 4.8 that struck 3 km WNW of Dededo Village, Guam, with a depth of 109.9 km, at 1:03 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.

The Offices of Guam Homeland Security and Civil Defense remind the community that when an earthquake strikes, conduct the earthquake procedure, “Drop, Cover and Hold On” until the shaking stops.

8:45 p.m. Tropical Depression 32W Forms Well South-Southwest of Guam; Hazardous Surf and Seas Remain

The National Weather Service (NWS) Guam Weather Forecast Office is monitoring Tropical Depression 32W, formerly Invest 90W, located near 9.5N 142.7E, about 310 miles south-southwest of Guam, moving west at 10 mph with maximum sustained winds of 30 mph. It is expected to maintain this general course with a decrease in forward speed through Wednesday, taking TD 32W close to Ulithi and Fais in Yap State.


Expected Conditions
  • Winds: Gusty easterly winds shifting southeast by Wednesday night, with sustained winds of 20–30 mph and gusts up to 40 mph.

Earthquake Recorded

The U.S. Geological Survey recorded an earthquake with a preliminary magnitude of 5.9 that struck 192 km WSW of Merizo Village, Guam, with a depth of 66 km, at 5:37 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.

The Offices of Guam Homeland Security and Civil Defense remind the community that when an earthquake strikes, conduct the earthquake procedure, “Drop, Cover and Hold On” until the shaking stops.

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.

8:15 a.m. Heavy Rainfall Expected by Midweek; Small Craft Advisory in Effect

The National Weather Service (NWS) Guam Weather Forecast Office continues to monitor a tropical disturbance that is expected to move toward the Marianas in the next few days and bring heavy downpours to the area around midweek. 

 Moderate uncertainty remains regarding potential rainfall impacts but locally heavy rainfall of 5 to 8 inches remain a possibility across the Marianas by the weekend. Flash flooding remains a possibility Wednesday through Saturday. Residents and visitors are advised to take the following precautionary actions:

8:50 a.m. Heavy Rainfall Anticipated to Develop Around Midweek as Disturbance Approaches

The National Weather Service (NWS) Guam Weather Forecast Office continues to monitor Invest 99W, a weak circulation near 12N147E, southeast of Guam. It has been downgraded to sub-low by the Joint Typhoon Warning Center, reflecting a decreasing potential for this disturbance to become a significant tropical cyclone. The NWS notes computer models still point to a disturbance to eventually take shape to the south of Guam by midweek, that is anticipated to lift north or northwest, bringing increasing showers and winds to the Marianas as early as Tuesday. 

4:10 p.m. Heavy Rainfall Expected Late in the Weekend through Next Week

The National Weather Service (NWS) Guam Weather Forecast Office issued a hydrologic outlook for Guam, Rota, Tinian, and Saipan.

A tropical disturbance, Invest 99W, is centered east-southeast of Guam near 10.6N 152.8E. This system remains disorganized, but it is expected to move toward the Marianas late this weekend into next week. 99W is expected to bring heavy rainfall to the Marianas from Sunday night through at least Thursday night.

1:20 p.m. Increased Showers Expected Next Week

The National Weather Service (NWS) Weather Forecast Office Guam is currently monitoring two tropical disturbances in the region.

The first system, Invest 98W, is a weak, but broad circulation that continues to slowly develop in southeastern Yap State near 7N144E. Heavy, gusty showers are mainly expected across Yap State and Palau the next few days. At this time, no direct impacts are expected for the Marianas from this system.

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