Consumers Energy and DTE Energy crews were already working feverishly into the night after severe thunderstorms knocked hundreds of thousands of Michigan customers out of power Wednesday evening.

Then another barrage of severe storms hit southeast Michigan overnight, adding flash floods, more downed power lines and trees, and more outages to the mix.

As of  10 p.m. Thursday, more than 187,000 Consumers Energy customers are without power, as well as more than 550,000 DTE Energy customers, according to both companies.

Check outage maps: DTE Energy | Consumers Energy

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The National Weather Service also issued a flash flood warning for southern Macomb County, southern Oakland County and northern Wayne County until 9 a.m. Thursday.

Between 2-4 inches of rain fell between the storms Wednesday afternoon and overnight, said Sara Schultz, meteorologist at the National Weather Service in White Lake. She said Pinckney accumulated a total of 4.21 inches of rainfall.

All lanes of northbound Interstate 75 at 9 Mile in Oakland County and both directions of I-94 at I-696 in Macomb County are completely blocked due to flooding as of Thursday morning, as well as all lanes of I-94 after Michigan Ave. Avenue in Wayne County. Eastbound I-696 at Groesbeck is also closed due to flooding.

Streets leading up to the Detroit Metropolitan Airport were flooded early Thursday morning. The lanes have reopened, but the airport’s Twitter warns that the flooding still impacts traffic and recommends leaving extra early for any flight

“Hot and humid” conditions will persist again today, according to the National Weather Service’s White Lake office, with afternoon heat indexes in the 90’s.

“We have a marginal risk for severe weather mainly between 4 p.m. and 2 a.m.,” Schultz said. “So today we’re looking at in the Detroit area around 90 (degrees) but then once we have this cold front that comes through later on, which is why we’re getting another round of storms and everything, it will start cooling off.”

Consumers Energy and DTE had dispatched hundreds of power restoration crews across southeast Michigan as of 8 p.m. Wednesday.

Live Michigan weather radar

Heavy rains and 60 mph winds damaged more than 2,000 power lines, DTE said in a news release. Teams will be working 16-hour shifts around-the-clock to restore power, as the company brings in 1,000 additional line workers from out of state to help with restoration efforts. DTE customers can expect a more accurate restoration estimate once a crew has been assigned to their outage, DTE said.

Despite the heavy winds, the NWS did not receive any reports of tornadoes, Schultz noted.

Consumers Energy warns people to stay at least 25 feet away from downed power lines. It also advises against using a generator inside an attached garage, basement, enclosed patio or near air intakes. Doing so could result in dangerous levels of carbon monoxide, a colorless, odorless gas that can be deadly.

Local responses

Royal Oak is dealing with citywide power outages, the library, farmers market, and senior centers are without power, according to an email from the city. Some generators have been deployed to traffic lights without power, but some still aren’t working.

The city of Warren said it has some flooding, but it is all due to high levels of rainfall and is not sewage. The city’s water department is actively monitoring the situation and helping streets and households dealing with flooding.

The Bush Library and the Warren Community Center are closed today because the power is out.

Michigan State Police in metro Detroit took to Twitter to warn residents of storm damage and power outages. Police reminded drivers to treat darkened intersections as a four-way stop.

DTE advised people to unplug and turn off their appliances to prevent an overload once power is restored. The company also advised against driving over downed power lines.