Baton Rouge area residents were under a flash flood warning for much of Sunday — with a flash flood watch in place the rest of the time — as streets flooded, barricades went up and one school across the river took on water.

The National Weather Service, meanwhile, is forecasting a 20% chance of showers and thunderstorms on Monday with areas of fog before 11 a.m.

On Sunday, the close to 4 inches that fell throughout most of the day brought closures of portions of South Acadian Thruway and Chippewa Street, as well as the exit ramp from I-110 North to Capitol Access Road. Pumps at all three locations were struggling to keep up with the volume of rain, the state Department of Transportation and Development said early on Sunday. 

Elsewhere, streets were flooded and barricades went up at 15 locations, city officials said. 

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Lauren Nash, a meteorologist with the National Weather Service in Slidell, said a rainfall of 3.95 inches was measured at the Baton Rouge Metropolitan Airport by 5 p.m. Sunday. Livingston Parish saw 3 inches to 6 inches of rain over the day, she said. 

Most of the rain fell in less than a three-hour period on Sunday, the National Weather Service said. The heaviest rain began shifting north, away from the I-10/I-12 corridor, at about 12:30 p.m., the weather service reported.  

One area school, Lukeville Elementary on La. 1 in Brusly, will be closed Monday, due to flood conditions, but will reopen on Tuesday, the West Baton Rouge Parish school district said. School employees, however, are expected to return to work, according to the school's Facebook page.

In Baton Rouge, the office of Mayor-President Sharon Weston Broome reported that emergency crews had responded by 3 p.m. Sunday to at least 15 calls for assistance from motorists in stalled vehicles.

"City-Parish crews have been placing barricades at high water locations all day, closing at least 15 roadways so far," the mayor's office said in a statement.

“As widespread rainfall and flash flooding continues in our area, please do not drive through flooded roadways or around barricades placed for your safety," Mayor-President Broome said in the statement. "Please pay attention to local weather forecasts and stay off the roadways, if possible, during heavy rain events.”

Email Ellyn Couvillion at ecouvillion@theadvocate.com.