Severe storms, flooding threaten U.S. south into early week

Following large hail and wind damage across the Deep South on Saturday, additional rounds of severe weather and flooding downpours will target these areas and expand eastward through Monday.

Two separate lines of storms pushing northeastward across the Deep South and Tennessee River Valley may cause severe weather to be clustered in two specific areas.

"The first cluster of severe weather is expected to push through South Texas and threaten communities from Laredo to McAllen and Corpus Christi on Sunday morning," AccuWeather Senior Meteorologist Kristina Pydynowski said.

These storms will move rapidly northeastward as an intense squall line this afternoon, rumbling through Houston and Baton Rouge, Louisiana, prior to sunset.

Sun Severe Static

More isolated severe storms may fire up both ahead of and behind this organized line across the lower Mississippi Valley and eastern Texas.

"The second area of severe weather may ignite around Little Rock and Memphis on Sunday morning before pressing northeastward over parts of the Tennessee and Ohio River valleys during the rest of the day," Pydynowski added.

These storms will likely lose some of their intensity by the time they reach Nashville, Tennessee, and Louisville, Kentucky, on Sunday afternoon, but will still be capable of producing brief torrential downpours and strong winds.

RELATED: Severe spring weather across the U.S. in 2018

21 PHOTOS
Severe spring weather across the U.S. in 2018
See Gallery
Severe spring weather across the U.S. in 2018
NEW YORK, USA - MAY 15:�Rainbow occurs after rain over Manhattan in New York, United States on May 15, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
NEW YORK, USA - MAY 15: People walk over a pedestrian crossing on a rainy day in New York, United States on May 15, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
Example ballots are caught by sudden winds as a storm system moves in quickly during Primary Election Day, in Philadelphia, PA, on May 15, 2018. (Photo by Bastiaan Slabbers/NurPhoto via Getty Images)
Severe weather builds up over Northwest Philadelphia, PA, on Primary Election Day, May 15, 2018. (Photo by Bastiaan Slabbers/NurPhoto via Getty Images)
NEW YORK, USA - MAY 12: Rain clouds are seen over between Lower Manhattan and Jersey City in New York, United States on May 12, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
WEEHAWKEN, NJ - MAY 23: A person walks in front of the skyline of lower Manhattan and One World Trade Center on a rainy day in New York City on May 12, 2018 as seen from Weehawken, New Jersey. (Photo by Gary Hershorn/Getty Images)
WASHINGTON, DC - MAY 14: The front of a severe thunderstorm passes over the U.S. Capitol, on May 14, 2018 in Washington, DC. The area was hit with heavy rain and high winds from the early evening storm. (Photo by Mark Wilson/Getty Images)
Simon Rusen-Morohovich, 19, of Pittsburgh, Pa. skim boards as storm clouds move in over Hollywood Beach, Fla. The National Hurricane Center says bad weather is coming from a stormy cluster over the Gulf and gives it a 40 percent chance of becoming a tropical cyclone over the next five days. (Susan Stocker/Sun Sentinel/TNS via Getty Images)
WASHINGTON, DC - MAY 14: People play sports on the National Mall as the front of a severe thunderstorm approaches, on May 14, 2018 in Washington, DC. The area was hit with heavy rain and high winds from the early evening storm. (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - MAY 14: People stand under a tree as rain starts to fall as a severe thunderstorm passes over the U.S. Capitol, on May 14, 2018 in Washington, DC. The area was hit with heavy rain and high winds from the early evening storm. (Photo by Mark Wilson/Getty Images)
LAKEWOOD, CO - MAY 14: A man covers himself with his coat as he walks down west Colfax Avenue during a heavy rain and hail storm on May 14, 2018 in Lakewood, Colorado. (Photo by RJ Sangosti/The Denver Post via Getty Images)
LAKEWOOD, CO - MAY 14: A man covers himself with his coat as he walks down west Colfax Avenue during a heavy rain and hail storm on May 14, 2018 in Lakewood, Colorado. (Photo by RJ Sangosti/The Denver Post via Getty Images)
PHILADELPHIA, PA - MAY 12: Members of the Philadelphia Phillies ground crew roll out the tarp to cover the field due to an incoming storm before the start of a game between the Philadelphia Phillies and the New York Mets at Citizens Bank Park on May 12, 2018 in Philadelphia, Pennsylvania. (Photo by Hunter Martin/Getty Images)
HOBOKEN, NJ - MAY 10: Lightning strikes New York City next to Hudson Yards on May 10, 2018 as seen from Hoboken, New Jersey. (Photo by Gary Hershorn/Getty Images)
NEW YORK, USA - MAY 12: Rain clouds are seen over Lower Manhattan in New York, United States on May 12, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
NEW YORK, USA - APRIL 16: People walk over a pedestrian crossing with their umbrellas on a rainy day in New York, United States on April 16, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
MADISON, CONNECTICUT -APRIL 6: Snow settles on a daffodil as an April springtime snowfall covered the East Coast of the United States on April 6, 2018 in Madison, Connecticut. (Photo by Tim Clayton/Corbis via Getty Images)
NEW YORK, USA - APRIL 2: Snow covered buildings are seen in Brooklyn borough of New York, United States on April 2, 2018. (Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)
NEW YORK, USA - MARCH 21: A woman stands with her umbrella during a late season snowstorm in Time Square, Manhattan in New York. The fourth nor'easter in three weeks hit the city on March 21, 2018 in New York, United States. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
WASHINGTON, March 21, 2018: People carrying ski gears walk past the Reflecting Pool in Washington D.C., the United States, on March 21, 2018. A late-season nor'easter, the fourth of its kind in three weeks, is targeting the northeast United States on Wednesday, bringing heavy snow and strong winds to the region. Washington, which is already snow-covered, is expected to see up to 6 inches of snow, as some models suggesting much high totals for the capital. Federal offices are closed for the snowstorm as the White House announced early Wednesday that all public events for the day were cancelled. (Xinhua/Ting Shen via Getty Images)
NEW YORK, March 22, 2018 : Photo taken on March 21, 2018 shows the Statue of Liberty seen in the snow storm in New York, the United States. Thousands of flights were canceled and public schools were closed as the fourth snow storm in three weeks began hitting New York City and its neighboring areas on Wednesday. (Xinhua/Li Muzi via Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

The main threats from all of the rounds of severe weather will be damaging winds, hail and flooding downpours.

There may also be isolated tornadoes, especially in association with the storms in Texas and Louisiana.

By Sunday night, the severe weather threat will shift eastward into Mississippi and eastern Louisiana and return to western Tennessee.

"The after-dark severe weather risk will make it important for residents to keep their cell phones on and charged with audible severe weather alerts enabled throughout the night," according to AccuWeather Meteorologist Renee Duff.

"Motorists along stretches of interstates 10, 20, 30, 35, 49 and 55 may face sudden reductions in visibility and a heightened risk of hydroplaning while traveling at highway speeds," according to Pydynowski.

With the soil becoming saturated due to the repeating downpours, wind gusts as low as 40 to 50 mph may be sufficient to knock down trees and power lines.

Gusts of 60 to 70 mph will be possible in the most intense storms, and winds of this magnitude can cause property damage and turn loose objects into dangerous projectiles.

Download the free AccuWeather app to find out when severe weather is likely in your community.

By Monday, the threat for heavy, gusty storms and repeating downpours will shift eastward into the Southeast and the Carolinas.

Southern US Rain Static

Although the threat for severe weather will be less severe than that of Sunday, a few incidents of wind and hail damage cannot be ruled out.

However, the main threat from the storms on Monday will be flash flooding triggered by torrential rainfall in a short amount of time.

Flooding of low-lying and poor-drainage areas, as well as small streams and creeks, is likely.

In areas hit by the heaviest downpours, streets and roadways may become temporarily submerged by larger rivers overflowing their banks.

Motorists should avoid flooded roadways. It only takes 1 to 2 feet of moving water to cause most vehicles to stall or get swept away.

In addition, the prolonged period of wet, stormy weather will only exacerbate and worsen the ongoing flooding issues on the Mississippi River and its tributaries.

Through Monday night, the highest rainfall totals of 3 to 6 inches are forecast to extend from eastern Texas and western Louisiana into southeastern Arkansas, northern Mississippi and western parts of the Tennessee Valley.

In these areas, an AccuWeather Local StormMax™ of 10 inches will be possible.

Outside of these areas, rainfall amounts of 1 to 3 inches will be most common.

Although dry weather is expected to return during the middle of the week, the weather pattern will remain favorable for more rounds of thunderstorms and heavy rain through at least the third week of April.

Read Full Story