India, April 2 -- A tornado outbreak is expected to rip parts of Oklahoma, Arkansas, Missouri, and Illinois on Wednesday. The National Weather Service (NWS) issued a rare 'high' risk severe weather outlook, warning millions in the Midwest and South. Multiple tornado watches are in effect in the four states.

'High risk' weather outlook was issued for the possibility of multiple long-lived EF3 or stronger tornadoes. NOAA's Storm Prediction Center says 'a tornado outbreak is expected this afternoon into early tonight from parts of the lower Mississippi Valley into the Mid-South and lower Ohio Valley'.

"Today has the making of a serious, severe weather outbreak across the entire state," the NWS in Little Rock, Arkansas, warned.

"Today has ...