While the Mayfield etc tornado may not have (at least officially, to the best of our limited knowledge of the exact nature of the 1925 event) dethroned the Tri-State Tornado for longest track ever; it did dethrone the April 24, 2010 Louisiana-Mississippi tornado (149.25 miles, another tornado that was almost certainly substantially more intense than its official 170 MPH low-end EF4, but in that case there's not much controversy regarding the rating of the actual damage observed, it just didn't hit much outside of clipping Yazoo City) as the longest-tracked tornado in the NEXRAD era.