Severe weather: More rain expected while Des Moines River floods following last night's flash floods

Update: The National Weather Service reported 4 inches of rain fell on Des Moines Saturday night with more expected to come. 

Following a night of flash flooding, the Des Moines River remains flooded at Southeast Sixth Street, and officials are "keeping an eye out" at the Raccoon River at Fleur Drive, where there is a flood watch, National Weather Service meteorologist Alex Krull said. 

There is a 50% to 60% chance of rain showers and thunderstorms Sunday night, which is expected to bring up to another three quarters of an inch of rain. 

The official measurement for Saturday night's showers at the Des Moines Airport is 2.48 inches, but Krull said residential gauges on the east side measured 4.7 inches. 

Original: Storms roared through Des Moines and the surrounding metro area Saturday evening, downing electrical lines and stranding vehicles. 

At least one car caught fire after an electrical wire fell on it, on 40th Place near Amick Avenue in northwest Des Moines. No injuries were reported. 

Des Moines first responders responded to multiple calls of people stuck in their cars as the water rose around them, prompting wet rescues, the Polk County Emergency Management Agency said. 

It was not immediately clear whether anybody was injured, or how many rescues were performed.

Those wading through floodwaters included music fans leaving the Shawn Mendes concert at Wells Fargo Arena. Vehicles got stuck on Martin Luther King Jr. Parkway on the north side, and five miles away at Southeast 14th and Maury streets.

A trained spotter near Gray's Lake in Des Moines reported 3.8 inches of rain during the storm. Officially, 1.83 inches fell between 9 and 10 p.m. in Des Moines, and 2.17 inches from 8 to 11.

Authorities warned residents to not venture down flooded roads. George Flagg Parkway was closed, and other roads were impassable due to flooding.

"We've received several reports of water over roads and some vehicles stranded leading to a couple of rescues," the National Weather Service in Des Moines said in a tweet.

"Please, TURN AROUND DON'T DROWN! Flash flooding is extremely dangerous, especially at night."

As of 10:35 p.m., a National Weather Service's flash flood warning was issued for Polk and Warren counties, including the capital city and suburbs, until 12:45 a.m. Sunday. 

Multiple roads have water over them, the weather service said, citing law enforcement.

Some people lost electricity; MidAmerican was reporting 620 metro-area customers without power at midnight.

Wind gusts of 50 mph were reported to the National Weather Service.

Saturday's storm came 51 weeks after a historic downpour caused widespread flash flooding in the metro area that killed one person and caused tens of millions of dollars in property and infrastructure damage.