 Here is information about a flash flood warning for the following county, Penobscot, Maine. The National Weather Service in Caribou has issued a flash flood warning for West Central Penobscot County in East Central Maine, Southern Piscataquis County in North Central Maine, until 2.15 a.m. At 11.16 p.m., Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 2 inches of rain have fallen.