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Residents across the Southeast braced for another round of severe weather on Sunday, after a storm system left at least 15 dead across the region and injured dozens more.

The National Weather Service said Sunday that southern Georgia, northern Florida and the corner of southeastern Alabama could face unusually strong "long track" tornadoes, damaging winds and large hail. Long track tornadoes, which plow on for miles, were also a real risk.

The weather serviced issued a "Particularly Dangerous Situation" Tornado Watch issued for parts of Georgia, Florida and Atlanta until 8 p.m. ET, including Jacksonville and Tallahassee.

The weather service's Storm Prediction Center warned on its website of a "dangerous outbreak of tornadoes" on Sunday afternoon and pressed for residents to prepare. Long track tornadoes, somewhat rare and capable of staying on the ground for 20 or more miles, were possible.

There are 4.8 million people under the high risk area; the total area of bad weather in the Southeast, who fall under the slight risk category or worse, is about 38 million people.

Earlier on Sunday, a tornado blew through a mobile home park in rural Cook County in southern Georgia — sheering off siding, upending homes and killing seven people, officials said.

Coroner Tim Purvis told the Associated Press an apparent tornado "leveled" the park before dawn Sunday and that emergency responders searched for survivors for hours after the twister struck. Purvis said the park had about 40 mobile homes, and roughly half were destroyed. The area was cordoned off by police.

Jalen Bennett, who lives about a mile from the mobile home park, said he was sleeping when a severe weather alarm sounded on his cellphone at about 4 a.m.

"I woke up and I looked outside — it was just a lot of thundering and lightning, and it was real dark," Bennett said. "I had to move downstairs to find shelter."

Bennett, 19, said his home wasn't damaged. He and other family members were staying put inside as more stormy weather pushed into Cook County.

Several homes appeared to be destroyed along on a road within about 2 miles of the mobile home park, with cinderblocks scattered on the ground and pine trees uprooted and snapped in half. The tops of broken utility poles lay alongside the road.

The South Georgia Motorsports Park in Cecil was heavy damaged; a grandstand was ripped apart. Barrels, signs, insulation and garbage were strewn over the speedway and parking lot.

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High-risk declarations for severe weather are rare. The last such issuance was June 3, 2014, according to Weather.com and hasn’t occurred in winter since 2008 . Since 1984, 42 percent of tornado fatalities have coincided with such high-risk days, according to the Weather Channel’s Kathryn Prociv.

The region under high risk hasn’t seen such a designation in a decade, the website for U.S. Tornadoes reported.