Record heat bakes the South as deadly tornado tears through Mississippi

One person has been killed and 18 others injured from severe storms, including a reported tornado, in Jasper County, Mississippi, officials said.

Twenty to 30 homes were "majorly affected or destroyed," Hudson Jenkins, director of Jasper County Emergency Management, told ABC News.

The reported twister in Jasper County was one of 17 tornadoes reported over the weekend across Arkansas, Oklahoma, Texas, Mississippi, Alabama, Florida, Oregon and Colorado.

More storms are flaring up Monday. Four more tornadoes were reported in the South: one in Alabama, one in Florida and two in Mississippi.

A flood watch is in effect Monday afternoon from Mobile, Alabama, to Pensacola, Florida, where rounds of heavy rain are forecast to slam already saturated areas.

A severe thunderstorm watch was also issued for San Angelo, Texas, through Monday evening.

On Tuesday, more severe storms are possible across Louisiana and into Mobile, Alabama, bringing the threat of damaging winds, large hail and brief tornadoes.

Meanwhile, record-high temperatures are baking the South.

Over the weekend, a record high of 111 degrees was hit in Del Rio, Texas, while New Iberia, Louisiana, tied its record high of 97 degrees.

On Monday, the heat index -- what the temperature feels like with humidity -- is forecast to reach 107 degrees in New Orleans, 113 degrees in Houston and a scorching 117 degrees in Austin, Texas.

The record heat is expected to continue for much of the week. The hottest days from Dallas to Houston will be Tuesday and Wednesday, with some relief by Thursday.

Click here for tips on how to stay safe in the heat.

ABC News' Victoria Arancio contributed to this report.