FLOOD WATCH FOR ALL HAWAIIAN ISLANDS THROUGH SUNDAY AFTERNOON. * WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. All the main Hawaiian islands. * WHEN. Through Sunday afternoon. * IMPACTS. Flood prone roads and other low lying areas may be closed due to elevated runoff and overflowing streams. Urban areas may receive more significant flooding and property damage due to rapid runoff. * ADDITIONAL DETAILS. - A low aloft will move closer to and over the islands this evening through Sunday, resulting in continued unstable conditions. Given ample moisture and instability, heavy showers and thunderstorms will continue to be possible, particularly over windward areas. Periods of heavy showers over already saturated ground could quickly lead to runoff and flash flooding. Water levels in already elevated streams could rise rapidly with additional heavy rain.