The flash flood watch includes Oakland County and remains in effect until late Sunday night, the forecasting agency says; a hazardous weather outlook warning of wind gusts up to 40 miles per hour, as well as possible isolated tornadoes, also has been issued.
"A Flash Flood Watch means that conditions may develop that lead to flash flooding," according to the National Weather Service. "Flash flooding is a very dangerous situation."
There is a 100 percent chance of heavy rain Sunday, with a high of 73 degrees and thunderstorms possible; Monday the high is expected to drop to 64 degrees with showers likely, according to the NWS.
"Rainfall rates in excess of an inch per hour are possible with these storms," the agency warns. "The heavy rain expected may lead to flooding of roads and underpasses and may lead to rapid rises in streams and rivers."