Does that 151 include long track tornadoes that crossed office lines... as one tornado and not 2 tornadoes. I have recounted them and still only come up with 115 tornadoes when you remove the duplicate entries
Wherever I found a tornado that crossed from one CWA into another, I counted it as just one tornado. I am pretty sure that, in the 151 number, there are none that are double-counted - although there are 2 or 3 in there that may have crossed into some other CWA but haven't been surveyed in the other CWA. I have six in the database that were confirmed by damage surveys to have occurred in more than one CWA.
A couple other points. First, I believe the 148 total in the 1974 Super Outbreak was for more than one day. I pretty much followed the definition Bobby Prentice quoted from Grazulis in a thread in W & C. So with at least 151 different tornadoes, this outbreak does exceed the 1974 record. Second, the total of 151 includes only tornadoes confirmed by damage surveys - and it is possible I may have missed a handful of those. However, NWS offices can and do enter tornadoes into the "confirmed" category by means other than damage surveys, such as video evidence and reliable spotter and/or emergency manager reports. So not every tornado that ends up confirmed is confirmed by means of a damage survey. So the total for this outbreak will certainly be significantly more than 151, and other means of confirmation may explain the figure of 178 cited by CNN.