A major tornado outbreak hits South, kills three in Alabama

A tornado killed at least three people and injured several others near the town of Ohatchee, Alabama, a Calhoun County sheriff confirmed Thursday, according to Fox-affiliated television station WBRC.

The big picture: A major tornado outbreak featuring high-end, "violent" tornadoes is now underway in Alabama, Mississippi and Tennessee, with cities including Huntsville, Memphis and Nashville at risk of severe weather.

Get market news worthy of your time with Axios Markets. Subscribe for free.

• The National Weather Service's Storm Prediction Center has issued a rare category 5 out of 5, "high risk" for severe weather, including potentially "violent" tornadoes, for northern Alabama, central and northern Mississippi, and western and middle Tennessee.

The latest: The National Weather Service issued a "particularly dangerous situation" tornado watch for much of Mississippi and Alabama until 8 p.m local time. The watch text indicates that "numerous tornadoes and several intense tornadoes" are expected in this area, along with storms containing very large hail and damaging straight-line winds.

• The watch area includes Jackson and Tupelo, Mississippi, and Birmingham, Alabama.

• The Storm Prediction Center bluntly states: "A dangerous environment is developing across the watch area."

• Another tornado watch is in effect for southern Illinois, southern Indiana, western and central Kentucky, southeast Missouri, northeastern Mississippi and western and middle Tennessee until 11 p.m.

• This watch area includes Nashville, Tennessee, as well as Paducah, Kentucky.

• So far, one long-lasting severe thunderstorm that tore a path across Alabama has done the most damage.

• One large tornado from this storm passed south and east of Tuscaloosa at about 12:30 local time, prompting a rare "particularly dangerous situation" tornado warning.

• That storm then moved northeast, toward Birmingham, where it spawned another tornado just southeast of Birmingham, prompting the National Weather Service to issue a tornado emergency, indicating a strong tornado on the ground in a populated area.

• This tornado damaged the home of well-known Birmingham TV meteorologist James Spann, who was broadcasting from the TV studio at the time. He told viewers his family was ok, though his home sustained significant damage.

• There are reports of injuries in Alabama caused by this twister. Based on radar imagery, that same severe thunderstorm was still producing a tornado as it crossed into Georgia at about 3:35 local time.

Details: The stage continues to be set for a dangerous afternoon and evening in the South as warm, humid air flows north from the Gulf of Mexico, just as a pinwheeling area of low pressure at upper levels of the atmosphere moves in from the west. Fronts associated with these features are setting off multiple rounds of severe thunderstorms.

• Winds blowing at different speeds and/or directions with height are ensuring that storms have the propensity to rotate, putting large hail and tornadoes on the list of threats.

• The storms have developed first in central to northern Alabama and Mississippi on Thursday afternoon, with the threat shifting north into Tennessee and parts of the Ohio Valley this evening into the overnight.

• The Storm Prediction Center is warning residents of the affected areas to expect a few "long-tracked, violent tornadoes," which could be devastating if they strike populated areas.

• In addition to this threat, "Large to very large hail, and damaging winds to hurricane force also are possible over a broad area from the central Gulf Coast to the Ohio Valley and southern Appalachians," forecasters stated.

Between the lines: Severe weather in this region can be especially deadly due to the housing types that are prevalent here, including large numbers of mobile homes.

• With thick tree cover, hills and winding roads, tornadoes that can be wrapped in areas of heavy rain can be harder to spot than twisters in the Great Plains.

• Nighttime tornadoes are especially deadly, in part due to the difficulty of warning residents and ensuring they reach safe shelters in time. This severe thunderstorm outbreak is forecast to continue into the evening and possibly the overnight hours.

This story is developing. Please check back for updates.

More from Axios: Sign up to get the latest market trends with Axios Markets. Subscribe for free