The United States military's Typhoon Warning Centre in Hawaii is monitoring a possible tropical cyclone south of Guam.
The Pacific Daily News reports that conditions are right for a tropical cyclone to form south of the Mariana islands within the next 12 to 24 hours.
The warning centre is monitoring a weather system about 260 nautical miles south of Guam which has undergone "significant consolidation" during the past 12 hours.
