 The National Weather Service in the Quad Cities has issued a flash flood warning for northeastern Delaware County, northwestern Dubuque County, until 12.15 a.m. At 6.15 p.m., emergency management reported thunderstorms producing heavy rain across the Warren area was causing water to cover roads west of New Vienna. Additional rainfall amounts of 2 to 4 inches are possible in the Warren area. Flash flooding is ongoing or expected to begin shortly.