The lower-Mississippi Valley will be a dividing line across the South on Monday.
A combination of disturbances aloft and a frontal boundary will produce scattered thunderstorms and possibly a thunderstorm complex or two across the Southeast quadrant of the nation. Some of this activity will contain locally damaging winds and heavy rainfall.
High-pressure aloft will rule most locations west of the Mississippi River. Sunny skies and triple-digit heat will cover much of Texas and Oklahoma. Parts of Louisiana and Arkansas will be in the upper 90s to near 100 as well.
Tuesday, the pattern will persist with more scattered showers and thunderstorms over the Southeast States and searing heat in the South-Central States.