...DISCUSSION... Models have come into better agreement depicting a shortwave trough moving quickly from TX Sunday/D4 morning to GA by 12Z Monday/D5. Low pressure is forecast to develop over the Red River during the day Sunday, shifting east toward the lower MS Valley by 00Z. Ahead of the low, a warm front will lift north across the Gulf Coast states, with upper 60s F dewpoints likely into central MS, AL, and GA, with low 70s F along the coast. MUCAPE to at least 2000 J/kg is likely by 18Z from TX into AL, with strong westerly winds aloft and 500 mb temperatures on the order of -10 to -12 C. Storms are forecast to form relatively early over east TX, where the environment will support large hail and damaging winds. Supercells are possible initially, with an eventual MCS likely. A tornado or two will be possible despite marginal low-level shear. Meanwhile to the east, warm advection may support supercells well ahead of the MCS across MS, AL, GA, producing a tornado or two along with hail. The primary severe risk in terms of coverage will likely be an MCS tied to the surface low as it quickly moves along the east-west instability gradient across LA, MS, AL and into GA. Significant convective feedback is present in the models, supporting the notion of a well-defined MCS with damaging winds. While SRH will not be very strong initially, it should increase after 00Z, with enhanced wind and/or tornado potential. The corridor of maximum threat will likely be adjusted in later outlooks.