A multi-day storm system is expected to bring severe weather to over 20 states and will affect over 60,000 million people. The greatest threat for severe weather stretches from north Texas to the lower Ohio Valley, with the focus shifting west into the Texas Panhandle and surrounding High Plains on Thursday. Friday will be the most significant threat, with an enhanced risk of tornadoes and large hail in Oklahoma, Kansas, and Missouri. A stalled front from Texas into the upper Ohio Valley will act as a focus for repeated storm development, while a stronger system emerging from the Rockies intensifies the threat late week. Major areas at risk include Dallas, Fort Worth, Arlington, Plano and Garland, Oklahoma; St. Louis, Missouri; and Louisville, Kentucky. An active early spring weather pattern is expected across the Continental U.S.