Officials monitoring disturbance north of Pohnpei; heavy rainfall possible Sunday and Monday

Broad disturbance to pass through Marianas. (NWS photo)

The National Weather Service (NWS) Guam Weather Forecast Office continues to monitor all activity in the region, including a broad disturbance, JTWC Invest Area 93W. The system is located north of Chuuk and Pohnpei, centered near 7 degrees north latitude and 152 degrees east longitude.

This disturbance, currently a broad surface trough, is expected to approach the Marianas and pass by Monday or Monday night. There is some possibility a circulation could form within this trough and possibly pass near or south of Guam around that time frame.

However, expectations are that this approaching disturbance will cause east to northeast winds to increase early Sunday into Monday with showers and thunderstorms also increasing into Sunday. These showers and thunderstorms will persist through Tuesday before diminishing midweek.

Model guidance shows the possibility for heavy rainfall that could result in short-term localized flooding in poor drainage areas. Winds could increase to 20 to 25 mph Sunday. Winds could gust to 30 mph at times through at least Tuesday. The increasing winds and northeast swell will make seas choppy and hazardous to small craft.

To prepare for any circumstance, the community is reminded to take the following precautionary measures:

·      Stay up to date with the latest information. Watch for flood advisories.

·      Those living in areas prone to flooding should be prepared to take action; clear drainage areas and unblock clogged storm drains in your area to minimize the chance of flooding.

·      In inclement weather, do not camp, park, or hike along streams, rivers, and creeks during heavy rainfall. These areas can flood quickly and with little warning.

·      Avoid hazardous surf and seas.


A small craft advisory remains in effect for the coastal waters of Guam, Rota, Tinian, and Saipan until 6 p.m. Tuesday. East winds of 15 to 25 knots with gusts up to 30 knots are expected. Conditions will be hazardous to small craft. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

A high surf advisory is in effect for Guam, Rota, Tinian, and Saipan through Tuesday afternoon. Surf will build up to 9 feet along north facing reefs and up to 12 feet along east facing reefs of the Marianas Sunday.

high risk of rip currents remains in effect through Tuesday. Rip currents can sweep even the best swimmers away from the shore into deeper water. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. If caught in a rip current, do not swim against the current. Swim in a direction following the shoreline, face the shore and call or wave for help. High surf will also cause localized beach erosion.

The Offices of Guam Homeland Security and Civil Defense (GHS/OCD) remind the community to avoid hazardous surf and seas until conditions subside. Prepare for heavy rainfall.

Visit the following links for the latest advisory information:

·      NWS Website:

·      NWS Facebook:

·      GHS/OCD Website:

·      GHS/OCD Facebook: