Portions of the nation's heartland are being warned about more severe weather following storms that killed at least 135 people this week.
The greatest threat for tornadoes Wednesday is between Memphis, Tenn., and Evansville, Ind., and neighboring parts of Arkansas, Illinois, Kentucky and Missouri. Other parts of the Plains and upper South could see storms, too, before the bad weather moves east Thursday and Friday.
A tornado at Joplin, Mo., killed at least 122 people Sunday and another 13 died Tuesday and Wednesday in Arkansas, Kansas and Oklahoma.
The Storm Prediction Center at Norman, Okla., upgraded the severe weather warning for the middle Mississippi Valley to "high risk," a warning also posted before tornado outbreaks in North Carolina and the Deep South last month and in Oklahoma on Tuesday.