It's becoming an all-too familiar pattern which began the weekend before Halloween. This time, low pressure will emerge from southwest Texas and interact with a vigorous upper-level low pressure and cold front coming out of the Rockies.
The surface low will be able to tap into abundant Gulf moisture while the upper-level low and front will provide sufficient lift and wind shear to allow strong, slow-moving and possibly severe thunderstorms to develop. Here is the depiction for late Monday:
Notice how the rain area expands by Tuesday:
This system doesn't move out until late Tuesday. Even this far out, the Storm Prediction Center is indicating that Southeast Texas and southwest Louisiana could have a risk for severe weather; first late Monday going into Tuesday morning:
And then from late Tuesday into early Wednesday:
This will definitely be a system to watch as it evolves, so stay aware and alert.