Guam and Rota are currently under a Tropical Storm Watch, while a Typhoon Watch is in effect for Tinian and Saipan. According to the National Weather Service, tropical storm conditions specifically for Guam and Rota are possible within the next 48 hours. As of 4:30pm Saturday, Tropical Depression 15W was located about 545 miles to the east of Guam. Maximum sustained winds are clocked at 30 miles per hour with higher gusts. It is moving west at 13 MPH.
According to the Joint Typhoon Warning Center, the formation is expected to become a tropical storm in the next 12-24 hours and is forecasted to pass close to Tinian and Saipan Monday evening as a Category 1 Typhoon with winds in excess of 75 MPH.
As for Guam, the JTWC is forecasting tropical storm conditions are most likely to begin Monday afternoon and continue through Tuesday. Tropical storms are described as having winds of 39-73 MPH. Residents are urged to start making preparations before conditions begin to deteriorate. The NWS recommends securing loose outdoor objects which can be blown around. The NWS plans to issue another weather update at 8pm or sooner if conditions warrant.
Meanwhile the Tropical Storm Watch for Guam and Rota also applies to coastal waters extending to 40 nautical miles.