Supercell storms cross southern states, leaving millions at risk of dangerous tornadoes

Mississippi, Arkansas and Louisiana counties are under watch Tuesday as a severe supercell storm system continues its journey across the United States.
The National Weather Service confirmed that multiple tornadoes touched down in Mississippi through Tuesday evening, leaving a path of destruction in their wake.
No injuries were reported as multiple tornado warnings were issued across the South and severe thunderstorms extended from eastern Texas to Georgia and as far north as Indiana.
Heavy rain and tennis-ball sized hail were also possible as forecasters warned the storm was expected to continue.
SEVERE WEATHER WILL IMPACT MISSISSIPPI AND TENNESSEE VALLEYS
The National Weather Service has extended its « Particularly Dangerous Situation » tornado watch for southeast Arkansas, northeast Louisiana and central Mississippi until 2 a.m. CT. The watch was originally scheduled to expire at 7:00 p.m. CT.
The Jackson National Weather Service earlier warned that severe storms, thunderstorms and tornadoes could be possible for central Mississippi, including the Jackson metropolitan area.
Dark clouds in Mound, Louisiana before a tornado.
(Twitter via Hayden Lester)
The National Weather Service has extended its « Particularly Dangerous Situation » tornado watch for southeast Arkansas, northeast Louisiana and central Mississippi until 2 a.m. CT. The watch was originally scheduled to expire at 7:00 p.m. CT.
FLORIDA SCIENTISTS DISCOVER LEVELS OF TOXIC ALGAE ALONG THE COAST

A tornado forms in Mound, Louisiana on Tuesday evening.
(Twitter via Hayden Lester)
A little after 7 p.m. central time, the National Weather Service advised residents of Caldwell Parish, Louisiana, to take shelter due to « a destructive tornado likely on the ground now. »
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Additionally, flood watches have been issued for parts of southeastern Mississippi and southwestern Alabama. The National Weather Service said three to five inches of rain in those areas could lead to flash flooding.
And in parts of the Upper Midwest, heavy snowfall was slowing traffic.
The Associated Press contributed to this report.
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