A trough moving over the state is bringing abundant tropical moisture expected to last though this evening. Heavy rain and isolated thunderstorms are expected to produce flash flooding, and while the greatest flood threat will be focused over Oahu and Maui County, all islands are at risk. * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...All main Hawaiian Islands. * WHEN...Through late tonight. * IMPACTS...Significant flooding may occur due to the overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain. * ADDITIONAL DETAILS... - Heavy showers and isolated thunderstorms with intense rain rates may develop at any time through tonight as a trough continues moving over the state. While the greatest flood threat will be focused over Oahu and Maui County, all islands are at risk.