Tropical depression to pass between Guam and Rota; damaging winds not expected

(NWS graphic)

The National Weather Service (NWS) Weather Forecast Office Guam continues to monitor Tropical Depression 16W. As of 1 a.m., 16W was located 13.5 degrees north latitude and 147.4 degrees east longitude, about 160 miles southeast of Saipan and 180 miles east of Guam. It is currently moving west at 18 mph with maximum sustained winds of 25 mph. It is forecast to maintain this intensity through Wednesday.

What to Expect

16W remains weak and at best, loosely organized. It is expected to pass between Guam and Rota, with its closest point of approach expected around 11 a.m. today.

Intensification is not expected until after it has passed well west of the Marianas. Damaging winds of 39 mph or more are not expected. Today and tonight, periods of heavy showers and gusty winds will occur.

Guam remains in Condition of Readiness (COR) 3 at this time. The government of Guam and the Guam Department of Education schools, and the Archdiocese of Agana schools will conduct normal operations today, August 17, 2021.

The following advisories remain in effect:

A flash flood watch remains in effect for Guam, Rota, Tinian, and Saipan through early Wednesday morning. A flash flood watch means conditions may develop that lead to flash flooding. Heavy rainfall of 2 to 4 inches with locally higher amounts are possible through Tuesday night. The community is advised to watch for additional advisories or a flash flood warning.

A high surf advisory and high risk of rip currents remains in effect for Guam, Rota, Tinian, and Saipan to 6 a.m. Wednesday. Hazardous surf of 8 to 10 feet is expected in the surf zone, for north and east facing reefs for Tinian and Saipan, and along west and north facing reefs for Guam and Rota. Dangerous swimming conditions and surfing conditions and localized beach erosion are expected.

Avoid venturing near reef lines facing north and east. Avoid swimming and snorkeling in these conditions. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Rip currents can sweep even the best swimmers away from shore into deeper water. If caught in a rip current, do not swim against the current. Swim in a direction following the shoreline, then head for the beach when out of the current.

A small craft advisory remains in effect for Guam and Rota coastal waters until 6 p.m. this evening. East winds of 20 to 25 knots with gusts up to 35 knots and seas of 9 to 11 feet are expected. Conditions will be hazardous to small craft. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

Visit the following links for the latest advisory information:

NWS Website:

NWS Facebook:

GHS/OCD Website:

GHS/OCD Facebook:

JRM Facebook:

For more information, contact the Joint Information Center at (671) 478-0208/09/10 beginning Tuesday, 8 a.m.

(JIC Release)