Rain in Texas, La. and Ark. will worsen 'historic' flooding event

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Dramatic Drone Footage Shows Scale of Louisiana Flooding

A ferocious line of thunderstorms responsible for three deaths and that left 25 million Americans facing the threat of floods was set to wreak more misery across the Gulf Coast and South on Thursday.

READ MORE: Obama's doctor shares unexpected exam results

Louisiana, Texas and Arkansas have been hammered all week with downpours, large hail, and at least two tornadoes -- and forecasters warned there was more to come.

See more severe weather in the gallery below:

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March storm flooding
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Rain in Texas, La. and Ark. will worsen 'historic' flooding event
Zavion Watson, right, pulls a boat full of relatives to dry land Friday, March 11, 2016, as they evacuate their homes on West Fontana Road in Independence, La., after heavy rains caused low areas to flood. (AP Photo/Scott Threlkeld)
Independence firefighter Chase Richard, left, lifts Lyliauna Sutherland, 9, from a boat Friday, March 11, 2016, after being evacuated with her family from their home on Highway 40 in Independence, La., after heavy rains caused low areas to flood. (AP Photo/Scott Threlkeld)
Independence Assistant Fire Chief Eric Anthony moves a high water sign out of swift-flowing floodwaters Friday, March 11, 2016, on Highway 40 in Independence, La. , after heavy rains caused low areas to flood. (AP Photo/Scott Threlkeld)
Independence volunteer firefighter Landon Woods lifts Nolan Sutherland, 6, from a boat Friday, March 11, 2016, after being evacuated with his family from their home on Highway 40 in Independence, La., after heavy rains caused low areas to flood. (AP Photo/Scott Threlkeld)
Sisters Briar Childress, second from left, and Jasmine Sutherland are helped from a boat by Independence firefighters Friday, March 11, 2016, after being evacuated from their home on Highway 40 in Independence, La., after heavy rains caused low areas to flood. (AP Photo/Scott Threlkeld)
A resident backs her car out of a flooded driveway after the water reached the bottom of her door jam, Friday, March 11, 2016, in Drew, Miss. A number of counties reported various levels of flooding from recent rains which began Wednesday and could last through Saturday. (AP Photo/Rogelio V. Solis)
Caution tape closes off this neighborhood in Drew, Miss., Friday, March 11, 2016, as floodwaters have affected areas in the Delta. The flooding has affected the Delta to varying degrees. Additional rain is expected to continue through Saturday. (AP Photo/Rogelio V. Solis)
Traffic rushes past this flooded neighborhood in Drew, Miss., Friday, March 11, 2016, as floodwaters have affected areas in the Delta. The flooding serves as evidence of the large amount of rain the Delta has received since Wednesday, and additional rain is expected to continue through Saturday. (AP Photo/Rogelio V. Solis)
A sedan sits underwater along Shaw Street in Drew, Miss., Friday, March 11, 2016, as floodwaters have affected areas in the Delta. Rain kept falling in Mississippi Friday as rescuers plucked people from flash flooding and residents along Delta rivers sandbagged against rising waters. (AP Photo/Rogelio V. Solis)
Flood waters rise against Nash's Express convenience store in Hammond, La., Friday, March 11, 2016. Torrential rains pounded northern Louisiana for fourth day Friday, trapping several hundred people in their homes, leaving scores of roads impassable and causing widespread flooding.(AP Photo/Scott Threlkeld)
Flood waters rise around Treasure Hunters Thrift Shop in Hammond, La., Friday, March 11, 2016. Torrential rains pounded northern Louisiana for fourth day Friday, trapping several hundred people in their homes, leaving scores of roads impassable and causing widespread flooding.(AP Photo/Scott Threlkeld)
An Entergy electric truck drives down a flooded street in Hammond, La., Friday, March 11, 2016. Torrential rains pounded northern Louisiana for fourth day Friday, trapping several hundred people in their homes, leaving scores of roads impassable and causing widespread flooding.(AP Photo/Scott Threlkeld)
In this photo released by the Louisiana State Police, vehicles lie in flood water, Wednesday, March 9, 2016, on Interstate-20 near the 55 mile marker near near Dubberly, La. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. The heavy rain flooded up to 80 homes, causing a nursing home near Minden to be evacuated, some high water rescues and water in the Webster Parish Courthouse. (Louisiana State Police/Col. Mike Edmonson via AP)
Police monitor floodwaters reaching Highway 80 in Haughton, La., Wednesday, March 9, 2016. Severe thunderstorms have caused major flooding and closed all schools in the area. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. (AP Photo/Mike Silva)
A speed limit sign is nearly covered by floodwaters in the Tall Timbers Haughton, La, subdivision Wednesday, March 9, 2016. Severe thunderstorms have caused major flooding and closed all schools in the area. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. (AP Photo/Mike Silva)
Louisiana State police help clear the road of debris at the entrance in the Tall Timbers subdivision in Haughton, La. Wednesday March 9, 2016. Severe thunderstorms have caused major flooding and closed all schools in the area. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. (AP Photo/Mike Silva)
Haughton, La. resident David Stewart takes photos of flooded homes in the Tall Timbers subdivision Wednesday March 9, 2016. Severe thunderstorms have caused major flooding and closed all schools in the area. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. (AP Photo/Mike Silva)
The lid of a car trunk and the top of a mailbox show how high flood waters have reached in the Tall Timbers subdivision of Haughton , La., Wednesday, March 9, 2016.Severe thunderstorms have caused major flooding and closed all schools in the area. Several parishes in northwest Louisiana have declared a state of emergency over widespread flooding, and the National Guard is being sent in to help. (AP Photo/Mike Silva)
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While severe thunderstorms were less likely Thursday, the rain was forecast to continue and shift eastward. Parts of Tennessee and Mississippi were also set to get soaked -- with up to a foot of rain possible in New Orleans through Saturday.

"Unfortunately, the heavy rain will continue over this hard-hit part of the South for another 24-48 hours before slowly shifting east," The Weather Channel reported late Wednesday.

The National Weather Service warned that the extra rain "will add to an already historic flash flooding event."

Louisiana Gov. John Bel Edwards declared a state of emergency on Wednesday.

Meteorologist Michael Berry in Shreveport told The Associated Press that 7 to 10 more inches of rain will fall in the next 24 to 36 hours.

The storm has been responsible for countless flooded roadways and water rescues across the region. By 4:30 a.m. ET, more than 20 flights had been canceled at Houston Bush Intercontinental Airport.

Residents were being actively warned to avoided submerged areas, with an 800-mile wedge of flood and flash-flood warnings and watches was in effect from southern Texas to Illinois.

The storm has already been responsible for at least three deaths.

A 64-year-old man died outside Lucky, Louisiana, after driving through floodwaters on a road, the Bienville Parish Sheriff's Office said. His 70-year-old passenger was found clinging to a tree and was rescued. The road was not barricaded, the sheriff's office said.

Two others died in separate accidents across the region since the storms began sweeping through Monday, officials said.

In Oklahoma, a 30-year-old man drowned when his SUV was swept away near his home in Broken Bow, close to the borders of Texas and Arkansas, according to the Oklahoma Highway Patrol. The man, later identified as Michael Liles, was trying to maneuver over a low-crossing bridge Tuesday night, reported NBC station KFOR of Oklahoma City.

A passenger in Liles' SUV was able to swim to the shore, but Liles went underwater and never resurfaced. The Highway Patrol said his body was recovered 100 feet downstream in about 8 feet of water.

In Texas, a 22-year-old man, identified as Francisco Ruben Garzaman, drowned Monday night after his canoe capsized in Dickinson Bayou, southeast of Houston near Galveston Bay.

Heavy rains have fallen over much of northwestern Louisiana, flooding up to 80 homes and causing a nursing home near Minden, east of Shreveport, to be evacuated.

Bossier Parish Sheriff Julian Whittington said in a Facebook post that at least 100 homes were underwater, and he warned that the dangerous conditions will continue for several more days.

"The water's continuing to rise, possibly 10 more inches or so. ... We're spread thin, but we'll come and help you when we possibly can," Whittington told residents.

Bossier sheriff's Lt. Bill Davis added that officers went door to door in the Fox Chase subdivision to evacuate about 30 homes.

The flooding comes after recent severe thunderstorms raged across parts of Central and North Texas.

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