https://imgur.com/2E4n0MO
Go to the entrance of storm and before you run the gauntlet go round to the right hand side and up the cliff face. You should end up at the top of the tracks, the one with no join is the one with the knowlege

Purple is the route up the cliff, red is the opening to storm and blue arrow leads to more knowlege and follow the river north to a 3 person jumping puzzle (there is knowlege on the top of the waterfall too but be careful!)