So sounds like the initial assessment of the Didsbury tornado is that it was certainly stronger than an EF2. I am guessing they are determining if it could have possibly crossed over into EF4 strength, which without question would be remarkable- and a generational type of tornado for Alberta. History and probability suggests it will fall in the EF3 category.
To put in perspective, there are on average 20 or so EF3s a year in the US, and perhaps a handful of EF4s. There have been several years with no EF4s on record in the US.
They have suggested the category will be determined this morning.
https://www.cbc.ca/news/canada/calga...-ef2-1.6895578