From the SPC:

STRONG TO VERY STRONG FLOW FIELDS OVERSPREADING A
DESTABILIZING WARM SECTOR (FEATURING LOW-MID 60S F DEWPOINTS AS FAR
NORTH AS PARTS OF NORTHERN MS/AL) WILL SUPPORT THE POTENTIAL FOR
ORGANIZED SEVERE THUNDERSTORMS. IN ADDITION TO A SEVERE SQUALL
LINE, A SUPERCELL RISK CAPABLE OF ALL HAZARDS IS CURRENTLY FORECAST.