* WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. Guam and Rota, Saipan and Tinian. * WHEN. Through Thursday morning. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS. - - A developing monsoon disturbance nearby is expected to produce rainfall amounts of 4 to 8 inches through late Wednesday night. Heavy rainfall potential may possibly last longer, so an extension of the Flash Flood Watch may be necessary, if conditions warrant. - http://www.weather.gov/safety/flood - http://www.weather.gov/safety/flood