Update 10 p.m.: A flash flood warning was issued for much of southwest Ohio, northern Kentucky and southeast Indiana.
The National Weather Service said rain will continue throughout the night with rainfall rates of one to two inches an hour in some areas. Some places will see repeated rainfall and could have totals of two to four inches of rain overnight.
Update 9:30 p.m.: Dangerous storms continue to move southward into southern Ohio and Northern Kentucky, the National Weather Service said.
Brief tornadoes and straight line winds are the main threats along with flash flooding. Never drive through flooded roads, especially at night, NWS said.
Severe weather: What do storm watches and warnings mean?
Update 8:50 p.m.: A tornado warning was issued for Butler and Warren counties at 8:46 p.m. Friday until 9:15 p.m.
Locations impacted include: Middletown, Mason, Lebanon, Springboro, Monroe, Trenton, Franklin, Carlisle, South Middletown, Hunter, Olde West Chester, Four Bridges, Wetherington, Jacksonburg, Hughes, Hageman, State Route 63 at State Route 741, Maud, Pekin and Poast Town Heights. This includes I-75 in Ohio between mile markers 21 and 37.
The National Weather Service said a tornado-producing storm was located near Middletown, moving southeast at 30 mph.
Radar indicated a tornado touched down in Mercer County, according to the Dayton Daily News.
“A confirmed large and extremely dangerous tornado was located over Fort Recovery, moving east at 30 mph,” the National Weather Service in Wilmington reported.
A tornado warning was also issued for parts of southeast Indiana through 9:30 p.m.
Northern Kentucky tornado warnings
The National Weather Service has issued a tornado warning for Florence, Independence and Erlanger, Kentucky until 9:45 p.m.
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Update, 4:20 p.m.: The National Weather Service has issued a tornado watch for Butler and Warren counties.
The tornado watch is in effect until 11 p.m. Friday.
Previous reporting: A flash flood watch is in effect from 6 p.m. Friday through Saturday morning in portions of Indiana, Northern Kentucky and Butler, Clermont, Hamilton and Warren counties in Ohio, according to the National Weather Service.
Forecasters expect 2 to 4 inches of rainfall in some areas. The storms could produce damaging winds and large hail, with the greatest chance for severe weather between 4 p.m. and midnight.
"Showers and thunderstorms are expected to develop late this afternoon and continue into the overnight hours," officials said. "The rain will be heavy at times with rainfall rates of 1 to 2 inches an hour possible in some of the storms."
People in the flood watch area should stay informed about weather conditions and avoid low-lying areas, according to the National Weather Service. Use caution when approaching highway dips and underpasses.
"Flash flooding can be extremely dangerous, especially overnight, so be sure to be ready to act if warnings are issued," officials said.
Cincinnati forecast: Here's what to expect
Friday: Mostly sunny, with a high near 94. Showers and thunderstorms likely at night, with a thunderstorm possible after 1 a.m. Some of the storms could be severe and produce heavy rainfall. Overnight low around 70. Chance of precipitation is 90%.
Saturday: Showers and possibly a thunderstorm. Chance of precipitation is 80%. High near 89.
Saturday night: Chance of showers and thunderstorms. Chance of precipitation is 50%. Overnight low around 70.
Sunday: Slight chance of showers and thunderstorms. Partly sunny, with a high near 91. Chance of precipitation is 20%.
Sunday night: Slight chance of showers and thunderstorms before 1 a.m. and after 5 a.m. Partly cloudy, with an overnight low around 72. Chance of precipitation is 20%.
Monday: Showers and thunderstorms likely, mainly after 3 p.m. Partly sunny, with a high near 90. Chance of precipitation is 60%.
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