I'm working on a more detailed track map of the deadly Mississippi tornado of this past Saturday but don't yet have it complete.
The National Weather Service in Jackson has upgraded its maximum EF-intensity rating from the "main" tornado to EF4 (which is what I had suspected would happen - see my last post). They now believe that the tornado was on the ground continuously for 149 miles. At times it was 1.75 miles wide!
Here is a link to the information on what the Jackson NWS has collected thus far.