Tornadoes, flash flooding and large hail wreak havoc across Louisiana, Southern U.S.

Over 30 million people across the central Gulf Coast states like Louisiana and Alabama and stretching further into the Southeastern U.S. were under severe thunderstorm and tornado warnings on Wednesday. Widespread severe weather has dumped heavy rain, as well as caused storm damage, rescues and an evacuation in the region.

Police in Slidell, La., part of the New Orleans metro area, warned residents of the dangers of venturing out, as they work to rescue people who were stuck in their vehicles and their homes.

⛈️ What's the path of the storm?

On Monday, the storm started barreling down on Texas, before moving east to Louisiana, Mississippi and Alabama.

National Weather Service meteorologists are warning that the powerful storm system will cause flash flooding and "widespread damaging winds" reaching up to almost 80 mph in the Southeast, multiple tornadoes and large hail through Thursday.

As of Wednesday morning, about 300,000 people across Texas, Mississippi and Louisiana were without power, according to PowerOutage.us.

By Thursday, the storm is predicted to shift southeast to Georgia, South Carolina, North Carolina and Florida, Fox Weather reported.

📍Louisiana

On Tuesday, over 100,000 Louisiana residents were under several tornado watches spanning from the northeast to the southeastern part of the state. The NWS had issued a tornado warning for Jackson, Saint Francisville and Wilson until Wednesday morning.

Residents were warned to brace for wind gusts that could get up to 70 mph with possible ping-pong-sized hail wreaking havoc on those parts of the state.

Law enforcement and local authorities advised Louisianians to stay off the road and to watch out for potentially "deadly" flying debris for people not sheltered in place.

"We have water that's rising right now. We're trying to get high-water vehicles to these areas to rescue people," Slidell Chief Administrative Officer Daniel Seuzeneau said in a Facebook video. "Trees are down everywhere; power lines are down everywhere. It's bad."

At least 11 school districts, businesses and all state government buildings have closed up shop Wednesday. Classes for Louisiana State University and Southeastern Louisiana University have been moved online.

The severe weather threat is predicted to back off of the state by Wednesday evening, Fox Weather reported.

📍Texas

Over four million people in South Texas were under a severe thunderstorm watch early Wednesday morning, the NWS reported. Several tornadoes were forecast to likely touch down.

Areas specifically in southeastern Texas have taken a significant brunt of the storm since Monday. Texans have experienced rainfall up to 12 inches with three more inches expected Wednesday, according to CNN.

A flash flood emergency has also been issued in the southeastern Texas cities of Kirbyville and Newton, near the border of Louisiana.

Rescue crews responded to “10 to 15 high-water rescues” in Kirbyville early Wednesday. Major roads there have also been shut down due to flooding.

"The City of Kirbyville remains under water and is still the major concern at this time," the Jasper County Sheriff's Office said on Facebook.

Wind gusts reached up to 88 mph in Briscoe and 78 mph in Knox City, both in the northern parts of the state.

Baseball and tennis-ball-sized hail has been reported in other parts of Texas like Austin.

Texas Gov. Greg Abbott on Tuesday directed the state’s Division of Emergency Management to deploy additional emergency response resources to support the affected communities.

"Texans in at-risk areas are encouraged to remain weather-aware, heed the guidance of state and local officials, and make an emergency plan to protect themselves and their loved ones," Abbott warned residents in a statement.

📍Mississippi

A tornado watch was in effect for central and southern Mississippi until 1 p.m. CDT on Wednesday, NWS reported.

NWS also confirmed that at least one tornado had already torn through Raymond, Miss. about 20 miles west of Jackson overnight.

A flood watch has also been issued through Wednesday evening in Jackson and surrounding cities. Some places have seen a total of over 8 inches of rain. The heavy rainfall could also cause "extensive street flooding" and nearby bodies of water to overflow.

North of Jackson, in Yazoo County, the sheriff’s office pleaded for residents to evacuate a subdivision.

"The levee is about to break on the lake and the houses will flood," the sheriff's office said. "Please get out ASAP!!!"

Mississippi residents were also supplied with more than 100,000 sandbags to protect their homes and properties.

📍Alabama

A tornado watch has been issued for over one and a half million residents in the southwestern part of Alabama until 5 p.m. CDT on Wednesday, according to NWS. A few tornadoes are likely to spread through the area.

Alabamans can also expect ping-pong-sized hail and gusty winds up to 80 mph.

Meteorologists are also warning residents in central Alabama that flash flooding caused by "excessive rainfall" is possible and could swell bodies of water. A flood watch remains in effect until Thursday morning for that part of the state.