Hawaii is preparing for a period of heavy rainfall and potential flash flooding, prompting the National Weather Service (NWS) to issue a flood watch for all Hawaiian Islands, effective from Wednesday morning through Friday afternoon. A deep layered trough is expected to develop west of the islands, drawing moisture northward and increasing the risk of heavy rain and flash flooding. This alert follows the recent Kona low storms, which caused significant flooding across the state, emphasizing the need for preparedness.