as I pointed out on the reddit thread, I am not sure the calculations are correct when the trees are planted in the optimum zone. The percentage numbers seem to scale linearly with duration and tree size, so it seems possible to me that the chance also reduces with the duration.
Heave been seeing that TS chances are actually mostly based on location and height.
More stage changes mean more chances to get TS, but preponderance of anecdotal data points making strong argument that to really have good TS chances you need to be in the right loc.
Center island, and Ynstere cliffs seem best for TS from what I can tell so far.
Saw your post Taco and hadn't put much time on it as of posting.
I have some data I've been passing around that someone cataloged but unsure how they did it.
Up against the Shield Wall in White Arden also seems to be a higher strike chance than those out in the gully between the two spurs.
Pine is temperate. WA is temperate. I imagine the Koreans wrote code to include proximity to storm points in the individual tree ID check at stage transition.