A First Alert Weather Day is in effect Sunday for heat index values in the triple digits, as well as a significant threat for large hail, tornadoes and destructive winds Sunday night. A severe thunderstorm warning has been issued for Delta and Hopkins until 7:15 p.

A severe storm with damaging winds, hail, and tornado risk is expected in North Texas Sunday night from 9 p.m. to 1 a.m.

Millions of people in Texas and Oklahoma, including the Dallas-Fort Worth Metroplex, will need to be on alert Sunday as the southern Plains braces for powerful storms packing destructive, hurricane-force wind gusts,