Storm system originated from one that dumped up to six feet of snow in Sierra Nevada. Blizzard warnings are in effect for portions of six states, from Colorado to South Dakota. Tornadoes could trigger additional twisters from eastern Texas through southern Mississippi Tuesday. The sprawling storm will make a full trek across the Lower 48 states. Tornado watches are in effect for parts of northeast Texas, northern Louisiana and southern Arkansas.
Snow has broken out and expanded across the western Plains from northeast Colorado to the Dakotas. Parts of the Mid-Atlantic and Northeast could see heavy snow and ice.
