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CNN —  

Golfball-size hail, floods and stranded drivers. This is what May in Houston is looking like.

More thunderstorms and showers hammered Houston early Saturday morning and were expected to last through midday, the National Weather Service said. There was a high risk of excessive rain in southern Louisiana and Mississippi through Saturday night.

With more heavy rain, there’s potential for flash flooding in areas where the ground is already wet, according to the National Weather Service’s Weather Prediction Center. There was a moderate risk of excessive flooding for southeastern Texas and parts of Louisiana on Saturday, the center said.

The Upper Texas Coast and the Gulf Coast of western Louisiana has received “tremendous rainfall” in the past week, “300-600% of normal rainfall in that time frame,” the center said.

The region has seen storms moving over the same location for hours at a time, which is known as training, CNN Meteorologist Derek Van Dam said.

Houstonians will see up to 3 inches of rain Saturday, and areas affected by storms may see heavier showers with up to 5 inches.

Over the weekend, the heavy rain will shift eastward toward Alabama and the southern Appalachians, Van Dam said. As the storm moves east, clusters of storms could produce more flash flood threats, the center said.

Flooding and tornado-like damage

Texas wasn’t the only place feeling the bad weather.

In Pearl County, Mississippi, a train on the Norfolk Southern line derailed Saturday morning when the tracks washed out due to flash flooding, said Danny Manley with Pearl River County Emergency Management.

Nobody was hurt or killed and the derailment didn’t cause closure of any major roads. The train compartments were mainly empty.

Residents across southeast Texas described damage similar to a tornado from storms that hit the area Thursday night into Friday morning, CNN affiliate KTRK reported.

“I’m old and I’ve never seen hail like that before,” Donna Aquino told the affiliate on Friday.

Other residents found themselves stranded after roads quickly flooded Friday evening, some opting to spend the night at gas stations, unable to return home.

“I would plead to everybody, if you know there’s high water coming up where you are, just stop,” one driver told KTRK.

Some drivers who left their cars on flooded streets returned to find their wheels missing.

The Harris County Flood Control District warned low-lying roads may be impacted by water coming out of the San Jacinto River – which has crested and is now falling – at US 59.