From SPC
Farther south, a bimodal severe threat may ultimately evolve with a
secondary corridor of more concentrated severe across portions of
the northern Gulf States. 500mb speed max is forecast to eject
across northern Mexico into TX by 03/00z. This feature will
intensify as it translates across LA into eastern TN by the end of
the period. There is some concern that severe probabilities may need
to be increased across this region to account for this low-latitude
speed max during the evening/overnight hours. Strong shear will
support supercells along with a threat for tornadoes, damaging
winds, and hail.