As a potent, multifaceted storm rolls out from the Rockies, severe weather ranging from high winds to a few tornadoes will be possible from the northwestern Gulf coast to the Mississippi Valley, AccuWeather meteorologists warn. Approximately 25 million people in the south-central United States will be at risk for severe thunderstorms on Tuesday alone. The storm will interact with warmth and moisture from the Gulf of Mexico pushed along by stiff winds. Heavy, gusty and perhaps violent thunderstorms will erupt later in the day Tuesday and Tuesday night as energy from the jet stream moves in miles above the ground. The first storms are likely to fire from portions of northeastern Texas, northwestern Louisiana and central and eastern Arkansas.