Parts of the South are again under the threat of tornadoes and severe storms

A tornado watch is in effect until 11 a.m. CT for eastern Louisiana, western Mississippi and southeastern Arkansas, the National Weather Service’s Storm Prediction Center said.

Severe storms moving through the region can produce tornadoes, wind gusts of up to 75 mph and large hail, forecasters said. Cities in the surveillance area include New Orleans and Jackson, Mississippi.

Flash flood warnings were also issued overnight for the Dallas area, where 1 to 3 inches of rain had already fallen and another 2 inches were possible.

“Be especially careful at night when it’s harder to recognize flood hazards,” the NWS Fort Worth office said.

Four people were rescued from fast-moving floodwaters in McKinney, Texas, about 30 miles north of Dallas, on Monday night, authorities said. The McKinney Fire Department said on Twitter carried out three separate water rescues. Nobody was hurt.

The severe weather line is the latest in a series of storms that have battered the southern US for three weeks in a row.

The first system spawned a deadly EF-3 tornado outside New Orleans and 25 tornadoes in Texas last month.

Bill Bunting of the Storm Prediction Center told CNN that weather systems can go into repeating cycles.

“The atmosphere has a fairly chaotic component to it, but occasionally it gets into patterns where we see this repeatability. We’ve seen it every season,” Bunting said. “Unfortunately, over the past month, and certainly over the next week, the threat of severe weather will again be present, in many of the same areas that have already seen enough severe weather in the last four weeks.”

Very moist air flowing north from the Gulf of Mexico, which has helped storms develop in recent weeks, is once again what we will see this week,” Bunting said.

When to expect the worst conditions

The storm will bring a wave of severe conditions to different parts of the South throughout the day Tuesday, CNN Meteorologist Robert Shackelford said. Tornadoes, damaging winds and hail are the main threats.

Here is the expected time of the worst conditions:

  • Jackson, Mississippi will see severe thunderstorms beginning around 5 a.m. and continuing through 10:30 a.m.
  • Cities from Nashville to Montgomery, Alabama will see severe storms beginning around 8 a.m. and lasting until around 1:30 p.m.
  • Atlanta will see the threat of severe conditions increase around 1:30 p.m. and last until 5 p.m.
  • A wide swath of comma-shaped cities from Charlotte and Wilmington, North Carolina, to Columbia and Charleston, South Carolina, through Savannah, Georgia, and Panama City, Florida, are expected to experience the worst conditions since 6 p. 22:00

By Wednesday, a separate system will form, bringing another round of storms to the south and extending the severe threat for another day.

“A second system develops immediately after the first as an upper depression strongly deepens and burrows across the central plains and eventually into the deep south,” the NWS Atlanta office said.

By Thursday, the threat diminishes, as the storms move away from the East Coast. While the system is bringing storms primarily to the south, we will still see rain Thursday across much of the East Coast.

Anywhere from Florida to New England, it will rain, so we could see some travel delays at some major airports on Wednesday and again on Thursday, as this system progresses.

CNN’s Jennifer Gray, Gene Norman and Chris Boyette contributed to this report.

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